Re: [CAD_CAM_EDM_DRO] screening

Jon Elson wrote in reply to ALex0youngs question,> Hi,

>
> Got myself a screened cable with 2 wires to be used

for the step-

> direction signal cables. I noticed that the USB cable

screen is

> an "aluminised?" sheet in contact with an exposed

earth wire.

>
> The "screened" cable I have, the "screen" is

a "network" of fine

> copper strands, no "aluminised" sheet. Will this be as

effective as a

> screen for signal cable?

The aluminized mylar shield, if made well, is slightly
better at shielding
electrostatic fields. This makes a difference
especially to microphone
signals running around inside radio stations, where the
transmitter fills
everything with interference. The braided wire shield
is more durable
over the long term with much cable flexing. Probably
either will work
well in this case for a hobby or home shop machine. For
real industrial
use, the braid shield would be desirable. There is also
special cable
made with more, finer wire strands to be used in
applications with a great
deal of flexing.

Jon

For real low noise work there are cables with a braid
over a foil sheild (usually RF coax type cables)like RG-
214.
Bill Higdon

> alex0young wrote:
>
> > Hi,
> >
> > Got myself a screened cable with 2 wires to be used for the step-
> > direction signal cables. I noticed that the USB cable screen is
> > an "aluminised?" sheet in contact with an exposed earth wire.
> >
> > The "screened" cable I have, the "screen" is a "network" of fine
> > copper strands, no "aluminised" sheet. Will this be as effective as a
> > screen for signal cable?
>
> The aluminized mylar shield, if made well, is slightly better at shielding
> electrostatic fields. This makes a difference especially to microphone
> signals running around inside radio stations, where the transmitter fills
> everything with interference. The braided wire shield is more durable
> over the long term with much cable flexing. Probably either will work
> well in this case for a hobby or home shop machine. For real industrial
> use, the braid shield would be desirable. There is also special cable
> made with more, finer wire strands to be used in applications with a great
> deal of flexing.
>
> Jon
>
>
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