RE: [CAD_CAM_EDM_DRO] Re: PWM stepper driver with external bridge

Alan,

> Dan Mauch's design, for example, uses an F84 for logic, will run up to 40
> volts and gives 1/4 step resolution. While rated for 5 amps, it could
> likely run close to 10 with just a wee bit of tweaking.

I know Dan was playing with a 1/4 step unit, but as far as I was aware he
has not put it into production. Am I missing something here??

> 2. You cannot expect that the "inbetween" steps in a
> microstepping controller
> to be at all accurate and as the number of intermediate steps
> goes up, so does
> the error. ( Ericcson/NJR has a useful app note describing the
> problem )
> If your aim is higher resolution, you would do better to use 1/2
> or 1/4 step
> and different pulleys to gain the increase.

This is a very good point that I think is often overlooked. It seems that
many people I have communicated with think that a microstepper will give
greater resolution.

Tim
[Denver, CO]

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