Re: [CAD_CAM_EDM_DRO] STEPPER TORQUE THREAD

In a message dated 04/26/2000 6:37:11 AM Hawaiian Standard Time,
stratton@... writes:

<< I turned a drum 2" in diameter and mounted it on the shaft, then hung
a weight on a string. That allowed measurement of both holding torque
and 'lifting' torque over a reasonable range of movement.

Chris

>>

Problem with this is, most of us have good torque at low speed. When and how
fast the torque drops off in relation to RPM is what most need to know. A
dyno using water or air or possibly electrical resistance would be the
easiest to construct and calibrate. Model airplane props and a tach might be
a low tech but useful method. Various diameter / pitch props would need to be
tested and performances plotted for interpretation.

Peter
THRD, Inc.