Re: [CAD_CAM_EDM_DRO] EMC questions

Tim Goldstein wrote:

> You do not mention the voltage rating and current rating of the motors
> nor how you have them wired (half coil, full coil, parallel coil, etc).
> You are also not mentioning the voltage of your power supply. These can
> all have profound influence on the maximum speed you can get.
>
> In your configuration you have down an acceleration of 20. That is VERY
> high. I run more in the 1 to 2 range.

Note that his machine uses mm as the user unit of measure. 20 mm/sec^2
is a lot less than 20 Inches/sec^2.

> Regarding freqmod.o, it does not
> output any pulses that my drivers react to when there is no motion being
> commanded.

It is possible, with certain configurations, to make it do so. It simulates a servo
system in software, and if the simulated encoder resolution is lower than the
steps/user unit, I think it will hunt.

> Additionally, a PII 233 is marginal to get a good solid pulse
> train out of EMC.

Especially with freqmod!

Jon