Small Clutch bearing test process 1

[LenTikular]

I have a small one way clutch bearing that I would like to 'cycle test'
The rated value of the clutch is around 1.5nm. Ideally I would like to exercise the clutch by applying a force of 1nm for lets say 5 seconds, release the force for 5 seconds and the repeat for x many hours.

Has anyone any tips on how I could best achieve this.

I'd be grateful for any help.

 

[Dougt115]

nm=nanometer??
Nm= Newton Meter

 

[1gibson]

Fixed clutch, shaft that can rotate, weighted lever arm on the shaft to supply the torque, support the weight with a platform that moves up and down.

Your load cycle is to lower the support platform and the clutch holds the weight, raise the platform to unload the clutch.

 

[GregLocock]

1.5Nm is tiny, 1gibson's excellent mthod can be slightly improved for the cheapskate by bumping a 150g weight on a piece of string with a cam.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[tbuelna]

LenTikular-

What you describe is called a "stroking test".

Before designing your test rig, the first thing I would suggest is performing a thorough analysis of the clutch system using the same materials, structural characteristics & operating conditions that you intend to test. The purpose of testing is normally to validate/refine your analysis work. Roller or sprag type clutches operate at very high contact pressures between the race and element surfaces, and even tiny amounts of race/element misalignment can produce significantly increased contact stresses.

One important thing with the design of your stroking test rig is to make sure there is some relative rotation produced at the race/element interface at each load cycle, so that the load application points on the race surfaces are randomly distributed.

Lastly, you will probably want to minimize the dwell time of each load cycle. At 10 sec/cycle, you will only accumulate 360 load cycles per hour.

Good luck with your testing.
Terry