Recently bought Mach3 R3.042.032

Could it be exactly the opposite to what I have said before and your PC is running too fast ?.

This link may be of interest:-

http://www.machsupport.com/forum/index.php/topic,11921.0.html

Tweakie.

Interesting! Will try to slow down the cpu as soon as I fix the power supply of the CNC. Apparently the bridge rectifier need to be mounted to a heat sink when driven above 3 amp... The supplier forgot to mention that. Replacing it with a 25 amp.

Where can I get the XP optimization file?

Bottom of this page :-

http://www.machsupport.com/downloads.php

Tweakie.

There is absolutely *nothing* to be gained by running the Mach3 kernel speed any faster than the fastest step rate you require.  All it does it eat up CPU bandwidth, and potentially create problems.  Few machines seem capable of running reliably long-term above a 45kHz kernel rate, regardless of what the driver test indicates.  If it works at 35kHz, and gives you the rapid speeds you need, then run it at 35kHz.  Going faster buys you nothing at all.

Regards,
Ray L.

There is absolutely *nothing* to be gained by running the Mach3 kernel speed any faster than the fastest step rate you require.  All it does it eat up CPU bandwidth, and potentially create problems.  Few machines seem capable of running reliably long-term above a 45kHz kernel rate, regardless of what the driver test indicates.  If it works at 35kHz, and gives you the rapid speeds you need, then run it at 35kHz.  Going faster buys you nothing at all.

Regards,
Ray L.

Thanks for the info. But this is moot since I get the problem from 25khz on... changing to higher frequencies was just done for troubleshooting.