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Testing Labs Choose Interface High Accuracy Products

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Specialists focused on testing applications work in a variety of testing lab environments. In each lab, technicians rely on the tools to collect and report on data that is used to make products safer, guarantee performance, ensure quality, and to meet the strict industry standards and requirements. Accuracy in testing data is dependent on the precision measurement devices and instrumentation used to capture the results.

We supply lab engineers with high-accuracy sensor technologies used to complete rigid test requirements. Interface is the top provider of test and measurement products used for structural and material testing, static and fatigue testing, torsion effects, tension tests, calibration testing, and environmental testing. Read more in Types of Force Measurement Tests 101.

Our standard high precision load cells, torque transducers, multi-axis sensors, and instrumentation are used on every continent for T&M. Based on our quality and performance, we are the chosen supplier to calibration and testing labs. We see our products used today for continuous improvement programs, advancements in smart manufacturing and new product designs.

If it must be measured, Interface has a solution. Our products are designed for small and large testing facilities, including calibration-grade load cells, load frames and test stands, along with data acquisition systems. The wide variety of our force measurement solutions designed for testing labs means we play a role in every industry that is making a physical product and the test labs that validates the products performance.

Testing Labs and Types of Testing Using Interface Solutions

General Automotive Test Labs:

  • Component and Sub-Component Level Testing
  • Suspension Testing
  • EV Battery Testing

Automotive Driveline Testing:

  • Engine Performance and Durability Tests
  • Motor Efficiency Testing
  • Power Analyzation (Electric)

Aerospace Testing:

  • Full Scale Structural Static Testing
  • Component Fatigue Test
  • High Precision Thrust Testing
  • Simulators
  • Wind Tunnel Testing

Geotechnical and Civil Testing

  • Concrete or Asphalt Core Testing
  • Soils Testing

General Structural and Component Testing

  • General Push and Pull
  • Design Proofing
  • Life Cycle Fatigue Validation

Medical Device Testing:

  • Prototyping
  • PPAP Validation and FDA Certification
  • Device Lifecycle Testing

Consumer Product Testing Labs:

  • Design Validation
  • Material Testing
  • Fatigue and Failure Tests

Interface recently highlighted testing lab applications in our Test Lab Essentials Webinar. Here you can see the lab use cases and products as they are reviewed by our applications experts.

Each of these testing types requires different force testing equipment, and our experts work directly with testing lab professionals to determine the products or systems they need for single and ongoing test requirements.

As testing technologies becomes increasingly complex, off-the-shelf products may not meet the needs of every Interface customer. We lend engineers expertise in test and measurement to support unique and custom requirements to get the right sensor, instrument, and system in place.

Since our first load cells were designed five decades ago, we have built millions upon millions of load cells and torque transducers used in testing labs around the world. Our products are built to withstand the rigor and requirements needed for high quality and reliable data collection in test and measurement. Our test customers depend on us for proving accuracy, consistency, and reliability in performance.

ADDITIONAL RESOURCES

Interface and Testing Lab Applications

Testing Lab Essentials Webinar

Engine Dynamometer App Note

Consumer Product Testing Case Study

Interface Solutions for Safety and Regulation Testing and Monitoring

Metrologists and Calibration Technicians 101

Motor Test Stand

GS-SYS04 Gold Standard® Portable E4 Machine Calibration System

Electric Vehicle Structural Battery Testing

Furniture Fatigue Cycle Testing App Note

Regular Calibration Service Maintains Load Cell Accuracy

 

The Rise in Digital Force Measurement Solutions

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In the early days of force measurement instrumentation and use cases, analog was king and, in many cases, still dominates most use cases. The fact that product manufacturers continue to provide analog solutions is steeped in the accuracy and reliability of the format.  Digital is changing this outlook and the rise of solutions that support digital output are on the rise.

Analog and digital signals are utilized for the transmission of information, typically conveyed through electrical signals. In both these technologies, data undergoes a conversion process to transform it into electrical signals. The disparity between analog and digital technologies lies in how information is encoded within the electric pulses. Analog technology translates information into electric pulses with varying amplitudes, while digital technology converts information into a binary format consisting of zeros and ones, with each bit representing two distinct amplitudes.

The primary difference between analog and digital is how the signal is processed. Analog signals when compared to digital signals are continuous and more accurate. Digital measurement solutions have come a long way and are growing in use and popularity due to overall trends towards digital transformation and modernization of testing labs.  Read Instrumentation Analog Versus Digital Outputs for further definition.

As more test and measurement professionals and labs are using digital instrumentation, the quality and accuracy of data output has skyrocketed. Primarily, it is much easier to gather and store digital data. This is often seen through the growth in wireless sensor technologies. Interface Digital Instrumentation continues to expand with new products.

Digital signals are stronger than analog signals, providing a better signal that is free from interference by things like temperature, electromagnetism, and radio signals. The data sampling rate is also much faster. As a result, load cells and other force sensors output signals transmitted to digital instrumentation can read and record hundreds of measurements in seconds.

Another major reason for making the switch to digital output is convenience and capability. Digital instrumentation opens a world of possibilities in terms of wireless data transfer, removing the need for wires and giving engineers more flexibility in terms of where to conduct tests, or monitor applications. It also allows for larger force sensor systems to work together on larger applications in which you need multiple data points on different forces around the object you are measuring.

Why Choose a Digital Solution

  • Lower-cost options
  • Works across existing networks
  • It is scalable without causing interruptions
  • Multiple sensors can be daisy-chained together on a single cable run
  • Built-in error detection
  • Less susceptible to noise

Why Choose an Analog Solution

  • Speed, fast transmission
  • Ease of use
  • Familiarity (standard)
  • Uses less network bandwidth
  • Compatible with DAQs and PLCs

Interface offers a host of digital instrumentation solutions and complete digital systems to easily integrate into your existing test infrastructure.  The Interface Instrumentation Selection Guide is a useful resource to help in the selection of digital equipment.

Basic Criteria for Selecting Digital or Analog

  • Is there an existing network you need to connect to?
  • Are you connecting to an existing DAQ device?
  • What is your budget?
  • How many sensors are you connecting?
  • Do you need to communicate through a bus?

Be sure to tune into the ForceLeaders online event, Unlocking the Power of DAQ Webinar, to learn about data acquisition and digital instrumentation.

Digital Instrumentation Brochure

Hydraulic Press Machines and Load Cells

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A hydraulic press is a machine that uses a hydraulic cylinder to generate a compressive force by applying a fluid, typically oil, to a piston. The hydraulic press works on the principle of Pascal’s Law, which states that when a fluid is subjected to pressure, it transmits that pressure equally in all directions.

Load cells are commonly used in hydraulic presses to measure the force or weight of the load that is being applied to the press. Load cells are essentially transducers that convert a mechanical force into an electrical signal. Load cells play a critical role in ensuring the safety, quality, and efficiency of hydraulic press operations, as they allow operators to monitor and control the force being applied to the workpiece with a high degree of accuracy and precision.

In a hydraulic press, the load cell is typically placed between the ram of the press and the die, where it can measure the force that is being applied to the workpiece as defined in our Press Forming and Load Monitoring use case. The load cell is usually connected to a readout or display that shows the operator the amount of force being applied to the workpiece. This readout may be a simple analog or digital display, depending on the specific hydraulic press and load cell being used in the machine.

Hydraulic presses are widely used in manufacturing industries such as automotive, aerospace, construction, and consumer goods. They are used for applications such as metal forming, punching, stamping, bending, and assembly. The presses are used to produce consistent and high-quality parts in a cost-effective manner.

Popular load cells for hydraulic presses are Interface’s Rod End Load Cells. In a hydraulic press, a load is applied to a piston or ram using hydraulic pressure, and the force generated by the press is used for various forming, shaping, or compression processes. A rod end load cell is typically installed at the end of the piston or ram, where it can measure the tension or compression force being applied during the pressing operation. The data acquired from the rod end load cell can be used for a variety of purposes, such as monitoring the force applied to the press to ensure that it is within the desired range, controlling the press operation, or capturing data for quality control or process optimization purposes. Rod end load cells provide accurate and reliable force measurement in hydraulic presses.

Interface Rod End Load Cell Models:

Load cells used for hydraulic presses typically have a high accuracy and sensitivity, as even small variations in the applied force can have a significant impact on the quality and consistency of the resulting workpiece. They are also designed to withstand the high forces and pressures that are typically involved in hydraulic press operations. There are numerous applications and use cases for hydraulic press testing, including:

Automotive and Aerospace Manufacturing: Hydraulic presses are used extensively in the manufacturing of automotive and aerospace components, where they are used to form and assemble various parts. Testing the press is important to ensure that it can handle the high forces and pressures involved in these applications.

Material Testing: Hydraulic presses are commonly used in material testing applications to test the strength and durability of various materials such as metals, plastics, and composites. The press can apply a controlled and measured amount of force to the material being tested, allowing for accurate and repeatable testing results.

Metal Forming: Hydraulic presses are often used in metal forming applications such as stamping, punching, and bending. It is important to test the press to ensure that it can apply the required force and that the resulting parts meet the necessary specifications. Read more in our Metal Press Cutting Machine application note.

Construction: Hydraulic presses are used in the construction industry for applications such as concrete forming and brick laying. The presses are used to apply a controlled amount of force to the concrete or bricks, ensuring that they are formed to the correct shape and size.

Recycling: Hydraulic presses are used in the recycling industry to compact waste materials such as cardboard, plastic, and metal. The presses are used to create dense bales of these materials that can be more easily transported and recycled.

Rubber and Plastic Molding: Hydraulic presses are also used in rubber and plastic molding applications, where they are used to form complex shapes and designs. Testing the press is necessary to ensure that it can apply the required force and that the resulting parts meet the necessary specifications.

Hydraulic presses are used in a wide range of industries and applications where a controlled and precise amount of force is required. They are used to produce high-quality parts and products in a cost-effective manner, while also ensuring safety and efficiency in the production process.

ADDITIONAL RESOURCES

Metal Bending Force

Press Forming and Load Monitoring

Interface Solutions for Material Testing Engineers

Tensile Testing for 3D Materials

Testing Lab Essentials Webinar Recap

OEM: Tablet Forming Machine Optimization

Benefits of Proof Loading Verification

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Proof loading is a critical test that is performed on sensors or load cells to verify their performance and accuracy under extreme conditions. Engineers may need to request proof loading verification to ensure that the sensors or other measuring devices being used in a particular application are accurate, reliable, and safe for use.

Upon request, Interface provides proof loading at the build phase of engineered-to-order load cells, as well as load pins, load shackles and tension links. By simple definition, proof loading is a safe overload rating for a sensor.

Load proofing is a special test that guarantees the sensor performs at maximum capacity before it’s released to the customer. If a manufacturer does proof loading, it will be documented in the sensors specifications that are shipped with the product. It is commonly requested for sensors that are used in lifting applications.

Additionally, quality engineers and testing professionals may request proof loading as part of quality control or compliance requirements. By ensuring that sensors and load cells are tested and validated before use, companies can ensure that they meet regulatory standards and maintain a high level of quality in their products and services.

The Proof Loading Process

By requesting proof loading, sensor users can verify the accuracy and reliability of sensors and load cells and ensure that they are functioning correctly and within their specified limits. Proof loading can also identify any issues or problems with sensors or load cells before they are put into service, allowing for repairs or replacements to be made if necessary.

Proof loading for sensors is a process of subjecting a sensor to a higher-than-normal load or stress to confirm that it can withstand that load or stress without any permanent damage or deviation from its calibration. The purpose of proof loading is to validate the accuracy and reliability of the sensor under extreme conditions, ensuring that it will perform correctly when it is in service.

During proof loading, the sensor is exposed to a controlled overload, typically between 150% to 200% of its maximum rated capacity. The sensor’s response to the load is monitored, and the output is compared to its expected behavior. If the sensor performs within acceptable limits and returns to its pre-loaded state after the load is removed, it is considered to have passed the proof load test.

When should you request proof loading for a load cell?

Proof loading for a load cell should be requested when there is a need to verify its calibration and ensure its accuracy and reliability under extreme conditions. This is particularly important when the load cell is used in safety-critical applications, such as in crane and hoist systems, industrial weighing and process control systems, and structural testing applications.

Proof loading is commonly used for sensors that are used in safety-critical applications, such as load cells used in cranes and hoists, pressure transducers used in oil and gas pipelines, and temperature sensors used in furnace applications. By performing proof loading tests, manufacturers and end-users can have greater confidence in the performance and reliability of their sensors, which can improve overall safety and efficiency.

In general, there are several situations where it is advisable to request proof loading for a load cell:

  • Before critical applications: In safety-critical applications, such as those involving lifting, handling, and transportation of heavy loads, a proof load test should be performed before the load cell is put into service to ensure that it can handle the required load without any issues.
  • After installation: It is recommended to perform a proof load test on the load cell immediately after installation to ensure that it is functioning correctly and within its specified limits.
  • After repair or maintenance: If the load cell has undergone repair or maintenance, a proof load test can be used to verify that it is still performing accurately and within its specifications.
  • After an extended period of non-use: If the load cell has not been used for an extended period, it may be necessary to perform a proof load test to ensure that it is still functioning correctly.

It is important to note that proof loading should only be performed by qualified and trained personnel using the appropriate equipment and procedures. This will ensure that the load cell is not damaged during the testing process and that it continues to perform accurately and reliably after the test is completed.

Proof loading is particularly important in safety-critical applications such as in the construction industry, transportation industry, and other industrial applications where lifting and handling heavy loads are involved. In these applications, the accuracy and reliability of sensors and load cells are crucial, as any inaccuracies or deviations from the expected behavior can result in dangerous and costly accidents.

Overall, proof loading is an essential test that engineers may need to request to ensure the safety and reliability of sensors and load cells in various industrial applications.

ADDITIONAL RESOURCES

IoT Lifting Heavy Objects

Cranes and Lifting

Recap of Use Cases for Load Pins Webinar

Tension Links 101

Aircraft Lifting Equipment App Note

 

Interface Solutions for Production Line Engineers

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Due to the influence of IoT, AI and big data, the role of production line engineer has become far more critical as manufacturers demand peak efficiency. These engineers need to stay current in automation technologies used to design, build, and monitor a production line for the benefits of decreasing speed to market, lowering costs, and improving outputs at the highest quality standards.

Among the many software and hardware solutions these individuals must also understand connected sensors are among the most important. Sensors are the nervous system of an automated production line, telling which machines must perform certain tasks, when, and how. They are a source for smart factories and smart manufacturing.

Sensors modernize manufacturing, assembly, and production lines by enabling real-time monitoring and control of the production process.

Measurement solutions provide accurate data on production parameters such as temperature, speed, pressure, force, and other relevant variables, which can then be used to optimize the production process, detect, and resolve problems in real-time, and prevent downtime. Additionally, sensors can be integrated into industrial IoT systems to provide valuable insights and analytics that can help manufacturers make data-driven decisions.

One of the sensor types that play a key role in these automated production lines are force sensors. Force sensors can be used by production line engineers across several different facets of an automated line. When designing a manufacturing line, there are quite a few factors that go into the full system. This includes process monitoring, quality control, predictive maintenance, energy management and inventory management. Force sensors play a role in each of these types of data points and processes.

For instance, a production line engineer can install sensors onto a machine that outputs a great deal of torque and monitor that torque to ensure the components creating that force are running smoothly, or if there are certain indicators that say it needs to be pulled off the line briefly for maintenance. When products on the line trigger certain force parameters such as weight, this can also tell the automated production line it is ready for the next stop in the process. Production line engineers design these lines around the sensing capabilities available and connected force sensing products have made a major difference in helping things become more efficient.

There is another automated process that also requires force sensors that is used as part of a manufacturing line, or as a standalone system – robotics. Production line engineers are doing a great deal of research and development into robotics to automate process that are repetitive, or far too delicate for human hands. Force sensors, in this use case, are used in both the testing of robotics to ensure accuracy or developed into the robotics to monitor certain functions over time.

Robotics can improve assembly and production processes, leading to higher efficiency, improved quality, and reduced costs. As technology continues to advance, the use of robotics by production line engineers in assembly and production is likely to become even more widespread.

Here at Interface, we have a great deal of experience in developing solutions for industrial automation and manufacturing lines. We have developed a few application notes to outline how production line engineers use our sensor solutions and force measurement products.

6-Axis Force Plate Robotic Arm

A customer wanted to measure the reaction forces of their robotic arm for safety purposes. The reaction loads occur at the robotic arm’s base; therefore, they needed a force measurement system at the base of the robotic arm. Interface suggested using their force plate option to install at the base of the robotic arm. Four 3-Axis Force Load Cells were installed between two force plates, then installed at the bottom of the arm. This creates one large 6-Axis Force Plate. The sensors force data is recorded and displayed through the two BX8 Multi-Channel Bridge Amplifier and Data Acquisition Systems onto the customer’s PC or laptop. Interface’s 6-Axis Force Plate was able to successfully measure the reaction forces of the customer’s robotic arm. Read more here.

Press Load Monitoring

Press forming is a method to deform varied materials. For instance, materials such as steel can be bent, stretched, or formed into shapes. A force measurement solution is required to monitor the forces being applied by the press forming machine. This ensures quality control and traceability during the production process. For large press forming machines, Interface recommends installing the 1000 High-Capacity Fatigue-Rated LowProfile™ Load Cell. When the material is placed under the punch plate to form a shape, the force applied is measured by the 1000 Series Load Cell. The force results captured is sent to the INF-USB3 Universal Serial Bus Single Channel PC Interface Module, where results can be graphed and logged on the customer’s PC with provided software. Interface’s force measurement products and instrumentation accurately monitored and logged the force results of the press force machine, ensuring zero-error production performance. Learn more about this application here.

Snack Weighing and Packaging Machine

A snack manufacturing brand wanted to weigh the amount of their snacks that is automatically dispersed into the bags during the packaging process. In this case, they wanted to weigh their potato chips being packaged. The company also wanted to ensure the potato chips are at the exact weight needed due to regulatory standards to be distributed out to consumers in the public. Interface’s solution was to use multiple SPI Platform Scale Load Cells, and install it to the potato multi-head weigher and packaging machine. The SPI Platform Scale Load cells were installed inside of the mount that attaches the head weigher to the packaging machine. Force results from the potato chips were read by the load cells and sent to the ISG Isolated DIN Rail Mount Signal Conditioner, where the customer is able to control the automated production from their command center. Using this solution, the customer was able to determine the weight of the potato chips being distributed into their bags with highly accurate results. They also were able to control the automated production process with the provided instrumentation. They will use this same weighing method for other snacks that need to be packaged. Read about the solution here.

Production line engineers turn to Interface due to our quality, accuracy, and reliability. Our products are used to test, monitor in real time, and created automated processes within a manufacturing line. As automation and robotics grow, you will continue to see new applications for sensors in this sector.

ADDITIONAL RESOURCES

IoT Industrial Robotic Arm App Note

Quality Engineers Require Accurate Force Measurement Solutions

Vision Sensor Technology Increases Production Reliability

Force Measurement Solutions for Advanced Manufacturing Robotics

Robotics and Automation are Changing Modern Manufacturing at Interface

Industrial-Automation-Brochure-1

 

Data Acquisition Systems 101

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Engineers and testing professionals use data acquisition systems to enable smart decisions. The data retrieved through DAQ systems empower users to identify points of failure, optimize performance, and create efficiencies in products and processes.

When it comes to measuring force, the accuracy and reliability of the sensor is a critical component to receiving quality data. The data acquired from measurement devices, including load cells, torque transducers, and other types of force sensors, is valuable for product development, research, and robust testing to ensure performance and durability of all types of innovations. Ultimately, utilizing precision-based data provides enhanced control and response for all types of applications and use cases. Interface provides a wide range of data acquisition instrumentation that is easily paired with our force measurement products.

By definition, a data acquisition system is a collection of components used to acquire data via analog signals and converting them to digital form for storage, research, and analysis. Data acquisition systems, also called DAQ systems, typically are made up of sensors, signal conditioners, converters, plus computer hardware and software for logging and analysis. Interface experts are available to help pair the transducers with the right instrumentation.

The data acquired through the measurement device is only useful if it is logged for analysis and traceability. This is where instrumentation, in particular DAQ systems come into play, in not only transferring data, but also obtaining the right type of data in a format and data transfer method that works with existing user systems.

Data acquisition that utilizes analog output has long been the standard in the industry. As new requirements for use cases and applications grow, test and measurement professionals and engineers find these systems advantageous because of the lower cost, easy integration, and scalability. They also like the advantage of daisy-chaining multiple sensors together on a single cable run to maximize the amount of data through single tests. More data improves the quality of analysis and monitoring.

Advancements in sensor technologies coincide with growing demands for digitalization and to gather more testing data. This is seen using multi-axis sensors, along with requirements for multi-channel acquisition that can integrate into existing systems already designed with specific digital connections and protocols.

In addition to improving speed of data output, acquisition systems offer an abundance of value-added benefits. This is primarily due to the digital signal, as they are less susceptible to noise and are more secure. The systems also typically have built in error detection. Digital signals are best for transmitting signals across longer distances or when you need to allow for simultaneous multi-directional transmissions. Many people like the ease of integration, both into existing networks as well as with other testing devices.

Data acquisition systems and accessories come in many shapes and sizes, wired and wireless and there are also a handful of different software options in different systems. All these various products such as digital instruments, input and output modules, cables, monitors, and accessories. Interface offers a range of DAQ products, including full systems including the sensors.

Interface Complete Data Acquisition Systems

BlueDAQ Data QA Pack

Force sensors can easily connect via the BlueDAQ Family Data AQ Pack for fast and accurate data acquisition. This solution provides a convenient way to view the test results from transducers including single axis, dual axis, 3-axis, and 6-axis multi-axis sensors. Check out our BX8-HD44 BlueDAQ Series Data Acquisition System for Multi-Axis Sensors with Lab Enclosure.

T-USB-VS Rotary Torque Transducer Data AQ Pack

Connecting dynamic torque transducers to the T-USB Rotary Torque Transducer Data Acquisition Pack will provide you with convenient way to view the test results for your torque transducers that have internal USB functionality.

WTS Wireless Data AQ Pack

Utilizing the popular WTS Wireless Data Acquisition Pack provides convenient wireless communication with speeds up to 200 samples per second. Learn more in our Interface Wireless Telemetry System Review. See the complete line Interface WTS here.

DIG-USB PC Interface Module Data AQ Pack

Interface’s DIG-USB Data Acquisition Pack enables a straightforward way to view the test results our load cells or torque transducers. Check out the popular DIG-USB Output Module and the DIG-USB-F Fast USB Output Module.

9325 Portable Display Data AQ Pack

Interface’s 9325 Data Acquisition Pack makes your system portable. The 9325 allows simple display of strain bridge based measurements such as load cells, torque transducers, and other mV/V output transducers with sensitivity up to +/-1 V/V.

INF-USB-VS3 PC Interface Module Data AQ Pack

Our INF-USB-VS3 Data Acquisition Pack connects Interface mV/V load cells or torque transducers to provide real-time data analysis.  Here is more information about the INF-USB3 Universal Serial Bus Single Channel PC Interface Module.

Interface Data Acquisition Systems are modular. We offer the complete system, including enclosures, along with single components to complete a system. Consult with our application engineers to learn what system would be best for your test and measurement programs.

Data AQ Pack Brochure

 

 

 

Interface Fall 2022 Customer Survey Results

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Interface recently conducted our semi-annual customer survey. We appreciate everyone that took time to share their experience based on collaborating with us over the past year. We prioritize all the individual and collective input and share all feedback and results across our entire company. Customer experience is a top initiative at Interface, and direct feedback is a critical measure of how we are doing to meet and hopefully exceed expectations.

We asked six questions in the latest survey to gather valuable insight and feedback about products, vendor selection, lead times and overall satisfaction. For four years, we have asked the most popular and standard question that measures customer satisfaction and reliability across all industries, “How likely are you to refer Interface to a friend or colleague.”

The importance of this question is to measure consistency. The responses to this question tell us how we are performing based on customer loyalty and brand recognition. The results of how people answer this question produce what is known as a Net Promoter Score (NPS). For this past survey, this question resulted in a +52 NPS. We are incredibly pleased to learn that the majority of respondents did select 10, on a scale of 0-10. We value the confidence.

Our trend for the past eight NPS surveys tells us that we are consistent in how we are operating as a company based on the feedback from our customers. Interface remains in the higher rankings of a NPS, where top performing companies are above +30. Most respondents also selected they were “exceedingly satisfied” with Interface when we asked, “How satisfied are you with Interface and your customer experience?“ to measure overall customer satisfaction. What we also learn in every survey that is there is always room to improve. As a customer-centric company, we are equally focused on being quality-driven as a precision manufacturer of force measurement solutions on which you can depend for accuracy and quality.

We also asked a question related to lead times on products. We learned that the faster we can deliver the products you need, the better. This is helpful as we plan our production for 2023 and beyond. We’ve been manufacturing more of our standard load cell product inventory for availability in our QuickShip48 program. The QS48 program is an online ordering program that guarantees delivery within 48 business hours. We are continually growing stock of these products that do not require any customization. Be sure to check out the QS48 products available here.

Our team also asked the Fall 2022 Customer Satisfaction Survey respondents to tell us what criteria they use for selecting a force measurement product and service company. We asked, “What factors help you decide to continue using Interface as a supplier of force measurement solutions? Here are the top five selected category responses:

  • #1 – Quality of Products
  • #2 – Accuracy Specifications of Measurement Devices
  • #3 – Past Buying Experiences (Relationship)
  • #4 – Services
  • #5 – Breadth of Product Offering

The other selections included: Customization and Modification of Products, Convenience, Lead Times, Product Fit and Test & Measurement Expertise.

Customer experience matters to us. We do value all the input and will use this direct feedback to measure how we do in growing your loyalty and satisfaction in 2023 and beyond.

Strain Gage Design Under Eccentric Load WRSGC Presentation

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By Ashlesa Mohapatra, product design engineer, Interface

In the global marketplace, Interface is well known as providing the force measurement industry’s most reliable and accurate products. One of the key reasons that Interface consistently earns this recognition is because we manufacture our own strain gages. Products engineered and manufactured at Interface use our proprietary strain gages, and each designed for the specific transducer model based on the application type and environment for use.

As an example of our dedication to quality and excellence in performance as it pertains to strain gages, I recently shared a technical presentation on the negative effects of eccentric load and how strain gage design can reduce these challenges.

Below is a brief recap of this presentation made to the attendees of the Western Regional Strain Gage Committee meeting that took place in Tempe, Arizona in October 2022. The summary explains why strain gage design can make all the difference in quality versus poor performance with load cells.

Interface redesigned the strain gages on one of our mini load cells, the LBSU Miniature Load Cell Load Button, also known as our ConvexBT – The Most Innovative Load Button Load Cell. Our goal in the redesign was to create more controlled and repeatable loading, in turn creating a more predictable output. Our research focused on strain gage designs for load cells where mechanical moment compensation is not feasible.

The main challenge with this initiative was overcoming the errors associated with eccentric loading by making the installation process smoother through a redesign.  This is difficult because strain gages are very small in size and therefore more difficult to work with, in addition they are extremely sensitive to the environment with factors like temperature, humidity, cleanliness and electric interference all potentially effecting performance.

Before diving into the redesign, I would like to touch on eccentric loading and the errors it will cause, as well as the varied factors in strain gage manufacturing that can lead to errors causing eccentric load. There are two types of eccentricity: loading and mounting. Eccentric load results from improper loading or mounting of the strain gage, which leads to off-axis loads and bending. This causes several problems including distorted measurement results, decreased load cell accuracy, and diminishing life of the load cell.

When a strain gage is mounted on the load cell incorrectly or gages are badly bonded, it will almost always be an error source and contribute to mounting errors. Also, when strain gages are not bonded to the load cell at appropriate temperature and humidity, it leads to bubbles under the gage. Chemical composition of the strain gage is critical, such as the adhesive between the foil and backing, based on the application in which load cell will be used in a lab, machine, or testing program.

With these factors in mind, we set out on a redesign continuous improvement project. The previous design of this products strain gages was rectangular in shape. So, when the load cell was loaded, eccentrically or not, the strain field would not pass through because of shape. Therefore, we began to look at other shapes for our strain gage design, ultimately landing on a circular “diaphragm” style strain gage that allow strain fields to pass through.

One of the features of this newly designed strain gage is the proprietary adhesive foil we used to adhere the foil to the backing. This adhesive provided a great deal of benefit including a lower modulus of elasticity making it resilient to adhesive failure, and the elasticity also allows for better flow.

Another feature is the full bridge gage pattern we used that provides three key advantages. This includes fewer solder joints and reduced risk for electrical shorts due to simplified wiring, reduced symmetry error, and consistent thermal performance.

One process improvement we wanted to point out was that in our calibration process we only used 5V excitation voltage. Most manufacturers use 10V to calibrate their load cells. Due to lack of thermal mass in the thin diaphragm design of our strain gage, the zero will shift due to high voltage and low poor heat dissipation with 10V. We use a 5V excitation voltage to calibrate these miniature load cells instead of the alternative to prevent overheating of the cell.

To further improve the design, we enhanced the inspection process. Our diaphragm gages are quality inspected for accurate mounting with visual and electrical testing. Visual testing includes checking for air bubbles under the gage, badly bonded edges, unreliable solder connections and flux residues. Electrical tests include checking for electrical continuity and insulation resistance.

We then moved our attention to the circuit board. Some manufacturers use a circuit board in the cable due to the limited space within the cell to improve zero balance zero balance and to better compensate for temperature. However, bending or moving this cable would put pressure on the board and shift the zero. Therefore, we elected to install an abradable compensation resistors inside the flexure instead of the cable. This keeps the compensation resistor close to the gages and is intimately bonded to the body of the sensor to improve the reaction time of the cell to temperature.

To evaluate and confirm that our design was superior, we assessed three different strain gage styles: the rectangular gages (discreet gages), patch gages, and our diaphragm gage. Each of the gage styles were placed on three different load cells and loaded at one degree centricity. This test was run at 45 degree increments eight times. The results showed diaphragm style provided more reproducible result under eccentric load compared to other gages.

This was an interesting undertaking that taught the project team a lot about strain gage design and eccentric load. What I took away from this experience, other than a superior design for our ConvexBT Load Button Load Cells, is that any commercially successful product has a strong process behind it. You also need to have a clearly defined process that includes a continuous improvement plan. Interface Minis are a popular product line that has been around for many years. As soon as a product like this hits a point of stagnation, it will lose its hold on the market. I am proud of our team’s ability to avoid stagnation by taking critical steps to improving the Mini product line, maintaining our reputation for having the best quality, accurate and reliable products no matter the capacity available for precision force measurement.

Western Regional Strain Gage Committee (WRSGC), a technical division of the national Society for Experimental Mechanics (SEM), was established to promote a free interchange of information about strain measurement techniques using strain gages.

Interface is a proud member and sponsor of WRSGC. Our engineers participate in the technical conferences, in both presentation and attendance. Interface’s Product Design Engineer Ashlesa Mohapatra presented at the event held in Arizona, October 17-19, 2022.

Quality Engineers Require Accurate Force Measurement Solutions

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In engineering and manufacturing, when introducing a product onto the market the requirements and regulations can be immense. Each industry has strict guidelines to ensure safety, durability, quality, and overall customer satisfaction. To meet these requirements, most product and component maker will have experienced quality engineers to help meet the necessary requirements in production.

Quality Engineers work in a variety of industries including automotive, transportation, infrastructure, aerospace and defense, industrial automation, medical and healthcare devices, and consumer product manufacturing. Their role is to monitor, test, and report on the quality. They are also instrumental in strategy, process development, and increasing output. Depending on the position, they are responsible for inspecting and testing raw materials, components, mechanical systems, hardware and software, as well as final products.

The Quality Engineer works with manufacturers, developers, project managers. Commonly, they are aligned with quality assurance and quality control teams to develop processes, test procedures and implement systems that ensure manufactured products and fabrication processes meet quality standards, safety regulations, and satisfy all stakeholders. They are the safeguard for companies that are creating, building and distributing products and materials.

Accuracy of testing and measurement data is fundamental to quality engineers. Critical to quality assurance and control processes, quality engineers rely heavily on all types of Interface high-accuracy load cells, weighing systems, and instrumentation for force measurement quality systems. Manufacturing quality engineers rely on products from Interface to test both products and equipment on a manufacturing line to ensure they perform reliably and meet certain safety standards.

Force measurement systems also make role of a quality engineer easier through the use of accurate data. This is because force measurement often enables automated, real-time monitoring of many processes used in the making of things. Interface precision load cells are used to monitor assembly line machine processes, test and monitor automation equipment like robotics, and weighcheck systems, and ruggedized equipment for quality control onsite and in remote locations.

Included below are a few examples of how force measurement systems are used in quality engineering.

Medical Device Interventional Guidewire Quality Inspection

A medical device manufacturer needs to do quality checks on threaded ends of their interventional guidewire devices. The threaded end of the guidewire contains an extremely small 000-120 thread that needs to be tested with go and no-go gauges in order to see if it will mate with other critical subassemblies. They requested a custom made turnkey test stand that is both inexpensive and flexible for varying lengths and models of guidewires.  Interface suggests a system where the customer can axially load and insert the guidewire through the MRT Miniature Flange Style Reaction Torque Transducer, secure it, and use an automated stepper motor on a slide base to test the thread quality. When in use, the MRT measures the torque magnitudes of both no-go and go gauges which indicate quality of the threaded guidewire.

Snack Weighing and Packaging Machine Quality Monitoring

One aspect of quality in the consumer packaged goods space is ensuring equal distributions of individually wrapped snack bags such as chips or candy. When snack manufacturing brand wanted to weigh the amount of their snacks that is automatically dispersed into the bags during the packaging process, Interface offered a solution. We suggested multiple SPI Platform Scale Load Cells, and installed them to the potato multi-head weigher and packaging machine. The SPI Platform Scale Load cells were installed inside of the mount that attaches the head weigher to the packaging machine. Force results from the potato chips were read by the load cells and sent to the ISG Isolated DIN Rail Mount Signal Conditioner, where the customer is able to control the automated production from their command center. The customer was able to determine the weight of the potato chips being distributed into their bags with highly accurate results. They also were able to control the automated production process with the provided instrumentation. They will use this same weighing method for other snacks that need to be packaged utilizing this machine.

Vehicle Crash Test Load Cell Wall Quality Inspection

A facility wanted to do crash tests on their vehicles for quality inspection. There are multiple tests such as structural testing of the vehicle, developmental tests, and regulatory and compliance tests and they needed to measure the force of the vehicle crash tests, on all axes. Interface’ suggested using multiple 3A400 3-Axis Force Load Cells, and attach it to the back of a cement crash wall. When connected to the BX8-HD44 Interface BlueDAQ Series Data Acquisition System, force result measurements will be recorded and displayed with the customer’s PC or laptop. The customer was able to measure the force of impact for all of their different vehicle crash testing demonstrations.

The applications of force measurements for quality engineers are large, and the necessity of obtaining this data is critical to creating, safe, reliable and high-quality products.

ADDITIONAL RESOURCES

Interface Solutions for Material Testing Engineers

Why Civil Engineers Prefer Interface Products

Why Product Design Engineers Choose Interface

The Five Critical Factors of Load Cell Quality

Our Reputation is Defined by Our Industry-Leading Quality

Interface Solutions for Research and Development