Re: [CAD_CAM_EDM_DRO] Re: shielding for steppers

On Thu Nov 22 14:44:16 2001, JanRwl@..., <JanRwl@...> wrote:

>
>In a message dated 22-Nov-01 12:13:11 Central Standard Time, cncnut@...
>writes:
>
>
>> Will wrapping the wires with alluminium foils be sufficient for
>> shielding?
>
>
>Peter: For "still" cables, this would be "electrically OK", so long as you
>"GROUNDED" this foil-wrap. You could do this reasonably-effectively by
>wrapping a dozen spiral turns of #18 tinned copper wire over the foil (alum.
>does NOT make a good "contact material"!), and then ELECTRICALLY connect the
>end of that copper wire to "machine ground" in a proper fashion.
>
>If you must do this over a "flexible link", say, where a motor is part of a
>moving carriage, you might do it "electrically best" if you nicely wrap a
>"ribbon" of alum. foil in ONE direction, then lay bare stranded #18 tinned
>copper wires along this foil (two should do, opposite sides, but CONTACTING
>the aluminum, all-along!), and then wrap the spiral-copper-wire over the
>link, maintaining a "neat" spacing about 1/4" between turns. Then,
>"double-wrap" at the ends, and bring the END out, to that proper "electrical
>connection" to machine-ground.
>
>Lotta hassle, but it may be MORE hassle to remove the wires, slip braided
>shield over that, solder a "pigtail" on the end, then slip shrink-tubing over
>all that, and shrink, etc. and then solder the wires back, again! Put a
>"company-logo" on that shrink-tubing! Summin to THINK on...
>
>Jan Rowland, Troll

Wrapping wire around the foil ribbon would make a better connection if it wer
sungged down with a lightly tightened hose clamp. As for the rest of the cable,
simply wrapping the foil with tape should suffice to protect it, unless it's
chafing against something, which is bad to begin with.

There isn't anything that can't be fixed, given an adequate suply of duct tape!
:-)

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