Re: [CAD_CAM_EDM_DRO] wire question

In a message dated 5/28/2003 2:32:05 PM Central Standard Time,
davemucha@... writes:

> I'm looking at some wire and am wondering if I should get unshielded for
> the steppers (16 condutor) and shielded home/limit/low votage and then
> unshielded for the 110VAC for the routers.

Dave: This sounds OK if you "dress" things logically (don't have tye-wraps
every two inches, pulled so tight the PVC flows). I have HEARD that shields
should NOT be used to conduct current (as in "return current" from LED's, etc.),
and they should be "tied to ground" only at ONE end (the
controller/power-supply end, NOT the "machine end"). Perhaps a good idea, but I have never seen a
situation where "problems went away" as soon as one end of the shield was
disconnected! Of course, I probably never had more than a few mA of current
flowing along the shield, so no matter. Someone should do some "field tests" on
this point, one day, and "publish" here!!! Jan Rowland


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