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The tested linear unit exceeds the required service life by more than a factor of 2

In the experiment number 428 of the igus® test laboratory, the wear behaviour of the special lead screw lift table was checked in a service life test. The special lead screw table was set up and tested in continuous operation under the following test parameters:

Test parameters:

Stroke: 315 mm

Load: 250 N (radially, centered)

Speed: 0.22 m/ sec.

Duty cycle pause: 1 sec.

Lead screw: high helix thread, 10 x 25 mm

Nut: SWZ-W-3008 (length: 30 mm)

Test setup: horizontal installation orientation

 

Test results:

Cycle count attained until discontinuation: 544,000 cycles

Axial clearance after test: approximately 0.6 mm

Torque after test: 0.8 Nm


At the time the test was discontinued, the linear unit was still operational.

Cumulative test power consumption: 1. Current (A) | 2. Cycle count

 

Conclusion:

The tested linear unit exceeds the required service life by more than a factor of 2. The unit attained 544,000 cycles instead of the required 200,000 cycles, at which point the test was discontinued.

Lead screw / lead screw bearing, "Piston ring solution" after test: