Re: [CAD_CAM_EDM_DRO] STEPPER TORQUE THREAD

That is a clever way of doing it. It is a system test and measures both the
driver and the motor.

Any thoughts about separating the motor performance from the system?

If we know number of steps and the holding torque at a fixed DC current and
then measure winding resistance and inductance shouldn't we be able to
reasonably predict the performance with an optimum driver?
Bertho Boman
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Dan auch wrote:

> I machined a capstan that was a bit under 2.000 diameter . It was reduced
> by 1/2 the thickness of the heavy nylon cord.
>
> One end of the line is attached to a spring scale that is deadheaded (fixed)
> . Several turn of cord are wrapped around the capstan loosely. The motor is
> commanded to run at a specific speed. With the line loose the capstan slips
> on the cord.
> The line is gradually pulled tight until the scale reading is taken.
> This gives the running torque. If you use a second spring scale you can
> figure the torque very acurately in oz inches.
> Then you measure starting torque and at various speed. Make your selve a
> nice chart in advane with the motor nameplate info, the voltage of the
> driver and the torque at starting, 50 RPM, 100 RPM, 200 RPM and 300 RPM etc
> Dan