Re: [CAD_CAM_EDM_DRO] Router spindle electrical noise.

What does your circuit look like for the limit switches? Do they
connect directly to a parallel port on a PC? If so, are you pulling the
pin low with a resistor, or just letting whatever is in the PC do it?
Most pins on the parallel port float high, rather than low, so this is
a bit strange.

If I were building it, I would tie the input pin high (to +5v) with a 1
000 ohm resistor, then ground one side of the switches, and connect the
other to the input pin. When a switch opens, the pin is pulled high by
the resistor. Of course you have to change the state your machine
control program looks for.

Regards,
JJ

On Sunday, Oct 19, 2003, at 09:21 US/Eastern, balsaman_cnc wrote:

> The electrical noise generated by my Porter cable Router is
> triggering my limit switch circuit. The limits are high and go low
> if there is a problem. They are all in series (NC). If I set the
> speed on my router down 20% or so the problem goes away. I slid one
> of those ferrite donuts over the limit switch cable with no effect.
> Is there something else I can try? I used shielded cable on all
> cabling EXCEPT the limit switches...do I need to replace all that
> cable? Are there other options?
>
> Thanks for any help you can provide.
>
> Eric
>
>
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