MNM Comp-3K-0.1 for Valve, Die & Industrial Spring Compression Testing

BUY NOW FROM USA

Call (832) 290-3120 or email mnmscales@yahoo.com for help matching the Comp-3K-0.1 to a spring-force range and compression fixture.

MNM Comp-3K-0.1 for Valve, Die & Industrial Spring Compression Testing

The MNM Comp-3K-0.1 3,000 lb x 0.1 lb compression scale is useful for valve, die and industrial spring testing when the spring can be safely compressed in a rigid fixture and the goal is to compare force at controlled heights or deflections. Its fine display and LP7515 Peak Hold/data-hold functions support both steady-force measurements and repeatable maximum-force comparisons.

Measure spring force at a defined position

Spring force is only meaningful when the spring position is defined. Record installed height, compressed height or deflection along with force. For rate comparisons, take readings at multiple controlled positions rather than relying on a single peak value. Maintain the same seating surfaces and orientation when comparing springs.

Valve spring and component checks

Valve spring testing often compares force at specified heights. The fixture should keep the spring centered and prevent buckling or sudden ejection. The 0.1 lb display provides fine visible changes, but your height measurement and fixture repeatability need comparable care if the force data is being used for sorting or setup decisions.

Die and industrial coil springs

Heavier die springs, compression coils and machine springs can require hundreds or thousands of pounds of force. Confirm the expected maximum is comfortably within the 3,000 lb system capacity and that the fixture itself can safely contain the spring. Never place hands or unguarded body parts in the potential ejection path of a compressed spring.

Repeatable spring-test workflow

1. Verify scale calibration and zero with the empty fixture.

2. Seat the spring consistently and apply a small preload if your test method specifies one.

3. Move to the first defined height/deflection, allow the force to settle, and record the reading.

4. Repeat at additional positions and calculate force change per deflection only when the test method calls for spring-rate comparison.

5. Unload and verify return to zero before the next spring.

Peak Hold: useful, but not a spring-rate substitute

Peak Hold can capture the maximum force reached during a stroke, but spring rate requires force associated with known deflection points. Use Peak Hold for maximum-force screening or breakaway-style events; use steady readings at controlled positions for rate and setup comparisons.

Common errors

• Spring is not centered and rubs the fixture, adding friction to the force reading.

• Height/deflection is not controlled, so force readings are compared at different spring positions.

• Test speed changes substantially, affecting peak values.

• The scale is recalibrated to hide a fixture problem instead of correcting alignment or preload.

Calibration guide: https://www.allscalesusa.com/post/how-to-calibrate-mnm-comp-3k-0-1-3000-lb-lp7515-scale

Buy the Comp-3K-0.1: https://mnmscales.com/product/compression-scale-3000-lb-by-0-1-lb-s-type-load-cell-indicator/