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

Hi Randy,

Have you read Daniel Statman's encounters with a noisy spindle motor?
Bryan made up a PCB for adding an inline filter for the parallel port
cable (see the SherlineCNC list). Other things to try are using a
single terminal strip for the computer and driver/PS box.

Also talk to Jeff. As you already know, he is quite helpful. Maybe his
newest PCB rev. would perform better in your setup?

Alan KM6VV

zephyrus@... wrote:

>
> Thank you David, Don, Jeff, Jeff, Alan and Ballendo for your replies.
>
> My two "nice" parallel cables (one a Belkin and one a CMS) each have all 25
> conductors present, all individual ground lines (no "cross" continity,) and
> continuity between the metal shells at each end. I am assuming that the
> shells are connected through the shield/drain wire, but just the continuity
> is enough to cause problems.
>
> At the PC end the DB25 shell is connected to the chassis and thus AC line
> ground. At the controller box, the chassis is connected to AC line ground.
>
> So I must isolate the DB25 shell from the controller chassis. Ballendo's
> analysis is right. I think all in all the cleanest way for me will be to
> mount a sheet of fiberglass in an oversize cutout in the controller box
> front panel and use regular metal-shell DB25 connectors (I have a whole bag
> of them already...)
>
> Best regards,
>
> Randy
>
> Randy Gordon-Gilmore ,----.___________ ______________ _________________
> ProtoTrains // = = === == || == == == = || == == == = == =|
> Rio Vista, CA, USA /-O==O------------o==o------------o==o-----------o==o-'
> zephyrus@... http://www.prototrains.com
>