Quality Assurance

Every step of our manufacturing process is supported by our staff and advanced quality control technology.

Quality is What We Do

Through the use of ISO 9001:2000 third party registration, R-R Spring Corporation will remain leaders in the spring industry in quality, service, delivery and overall customer satisfaction. Our dedication to quality has allowed us to become trusted spring manufacturers from our home in, Chicago, Illinois, to around the world.

Equipment that we use in our quality lab includes:

  • Micro Studio PMZ 900N
  • Micro Studio LED 3D
  • Keyence IM-6500
  • Carlson 600 Gram
  • Chatillon DST 40
  • Larson CDHT 750


Micro Studio PMZ 900N

The PMZ 900N is an automated load scale that is capable of testing compression springs up to 19 inches long and 2 inches in diameter, and extension springs with a stroke up to 20 inches. Its maximum load capacity is 200 pounds. In addition to its load-at-length measuring capability, the PMZ 900N can measure a springs free length, rate, and initial tension.

Automation allows the PMZ 900N to perform complicated operations more quickly than a manual load tester. Some of the automated processes that the PMZ 900N can perform include, setting a spring to a specific length or load before testing, recording the length at any given load, recording loads at a given deflection from free length, and recording multiple loads in one continuous stroke movement.

Another time saving feature of the PMZ 900N’s software allows the user to save part number specific test programs and recall them at any time. An operator can set any number of tests within each program.

The PMZ 900N also allows you to operate the scale like a traditional manual load tester with both physical and on-screen buttons, allowing you to interact with the spring in a less structured manner if desired.

For a real life example of the PMZ 900N in use, say we have a 1-inch long conical compression spring that needs to be compressed five times to 0.400 inches before testing. The spring must not lose more than 0.010 inches in length after set. Furthermore it needs loads measured at, 0.900, 0.700, 0.500, and 0.400 inches. Lastly, we would like to see a rate measurement between 0.900 and 0.400.

With the proper programming, the PMZ 900N will measure the spring’s free length. Then, move to set the spring at 0.400 inches 5 times, and measure the free length after it is set. At this point the difference in length will be calculated. Next, the scale will make one smooth stroke movement down to 0.390 inches and display the load readings for 0.900, 0.700, 0.500, and 0.400 inches, as well as the rate between the first and last loads.

Once the test is completed, the software will warn the operator of any results that are out of specification. This exact test takes approximately 18 seconds to complete.

The PMZ 900N can also be connected to Micro Studio LED 3D. This allows the tests taken by the PMZ 900N to utilize functions of the LED 3D such as, concentricity or parallelism measurements, at any point during the testing program. The reverse is also true for the LED 3D in junction with the PMZ 900N.

Both the PMZ 900N and LED 3D allow the operator to record test results for analysis and capability testing. These results can be printed and shared with machine operators as part of their production control monitoring. Results can also be saved within the software or as reports in the from of PDF or spreadsheet.

The PMZ 900N has 2 weaknesses, long narrow springs and springs that have loads outside of its operating range. For parts that fall into those categories we use our manual load scales.


Micro Studio LED 3D

The LED 3D is an image measurement system (IMS) specifically designed for cylindrical and conical compression springs up to 3.5 inches long and 2.5 inches in diameter.

Operating on a dedicated version of the software used by the PMZ 900N, the LED 3D has all of the same test program customization and test result storage and presentation. In fact, The LED 3D shines most when it is used in tandem with the PMZ 900N to create a detailed set of measurements.

The LED 3D also has a manual mode that allows you to place a spring onto its rotating platter and instantly view free length, squareness, and parallelism results.

Let’s take the conical compression spring from the PMZ 900N example above and remove the “must not lose more than 0.010 inch in length after set” condition, and assume that the part takes a significant set.

The operator can use the LED 3D to measure the concentricity of a part, before and after the 5 compressions to make sure the spring stays centered even after set. To achieve this, the part must be moved when prompted from one scale to the other in-between steps. The results will all be saved to the same report.

The LED 3D can also be used as a troubleshooting tool for machine operators when they are setting up conical springs. The IMS can rotate the platter that the spring is placed on, count the number of coils, and track the diameter along the entire body of the spring. The results are then displayed on a graph allowing the operator to see the taper of the spring.

This is important because taper is something that the caliper cannot measure. Some springs require a perfectly even taper from the small end to the large end; others require a given number of coils to be at the minimum or maximum diameters. The diameter throughout the spring also has an effect on any load or rate measurements. Being able to measure the taper removes the need for the ‘guess and check’ method and speeds up the setup process.


Keyence IM-6500

The Keyence IM-6500 is used for measuring lengths, radiuses, angles, parallelism, and more. This high precision image measurement system (IMS) features a wide range of tools that allows the operator to measure dimensions of various complexities. It is used to measure wire forms, torsion springs and springs that might have a leg, hook or other feature.

The IM-6500 nearly eliminates the need for a traditional optical comparator. The point and click to measure operation of this IMS dramatically cuts down on inspection time as compare to an optical comparator.

Unlike an optical comparator this IMS can be programmed to perform predetermined measurements on a given part at the push of a button. This allows a machine operator to utilize the IM-6500 as part of their production control and monitoring.

The IM-6500 features a high precision mode for small parts of details that need to be measured and there is also a powerful LED light source that can illuminate features on surfaces that cannot be seen on an optical comparator.

Manually Operated Load Scales

The PMZ 900N has 2 weaknesses, long narrow springs and springs that have loads outside of its operating range. For parts that fall into those categories we use our manual load scales.

The Carlson 600 Gram, the Chatillon DST 40, and the Larson CDHT 750. All three are manufactured by the most trusted names in spring testing and have maintained their accuracy for many years. They are reliable, easy to use, and require less initial training to operate effectively.

The Carlson 600 Gram is used for small light wire parts that need a more sensitive load scale than the PMZ 900N. It can measure springs up to 1.3 inches long and 1.3 inches in diameter. The Carlson has a limit of 1.3 pounds but is typically used for springs with loads below 0.100 pounds.

On the opposite end of the PMZ 900N’s limitation is the Larson CDHT 750 with a maximum load of 750 pounds. This scale is used for strong compression springs with relatively heavy wire up to 5.8 inches long and 2 inches wide. We can however accommodate springs up to 3.8 inches wide on this scale with a set of custom fabricated plates. This scale is used for any springs that need loads above 200 pounds.

The last scale, the Chatillon DST 40, is can be used for most compression springs and extension springs that have loads up to 40 pounds. It features a wide 4-inch plate and 8.2 inch stroke. Holes in the upper plate allow the operator slide springs onto support pins of different diameter. This is important for long narrow springs, as these types of springs tend to buckle when they are compressed. A support pin inside of the spring will force the spring to exert force vertically and allow the operator to get an accurate reading.  

Contact Us

100 Laura Drive, Addison, IL 60101

+1 (630) 543 7445


Downloadable/Printable ISO Certificate