Re: [CAD_CAM_EDM_DRO] Insulating D-shell from chassis?

At 11:14 PM 11/16/03 -0500, Dave wrote:

>The last thing that you want to do is to isolate a chassis mounted
>component from ground. My question is: do you know for sure that you
>have a ground loop?

Oh yes, indeed. This is from the "random motor steps" discussion from a
month or two back. After properly star grounding the driver box, using
shielded motor cables (terminated only at the box end), making sure I was
using a proper parallel cable with all 25 leads and good shielding, I was
still getting occasional random steps on all 3 axes, especially with the
spindle motor running (oh, and I retrofitted the Sherline spindle control
box with a shielded power cord).

Isolating the DB25 connector from the driver box chassis did the trick. It
is rock solid now.

Best regards,

Randy

Randy Gordon-Gilmore ,----.___________ ______________ _________________
ProtoTrains // = = === == || == == == = || == == == = == =|
Rio Vista, CA, USA /-O==O------------o==o------------o==o-----------o==o-'
zephyrus@... http://www.prototrains.com