Re: MaxNC modifications

I agree the aluminum foil shielding looks ugly, but it fixed the problem
without having to wait until I could get out to my local electronics store!

I know the majority is saying software is the problem right now, but I am
willing to be the black sheep and stand out. My major reason for thinking it
is something else is that the lost steps have been exhibited with a number
of different software packages. To me that says the problem is not in the
computer, but in the cable, controller electronics, motors, wiring.

What happen when you turn up the amperage to the motors. Does the problem
get better, get worse, stay the same? You mentioned that the motors are
running well below the rated amperage, any reason you haven't cranked the
amps to get more torque?


Tim
[Denver, CO]

> -----Original Message-----
> From: Mo [mailto:mo@...]
> Sent: Wednesday, June 16, 1999 2:39 PM
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: Re: [CAD_CAM_EDM_DRO] MaxNC modifications
>
>
> From: "Mo" <mo@...>
>
> Tim, The route you took Tim sure looked ugly :) - but it was the best way
> out
> Ferrite rings around which you wrap a few turns of a cable you
> wish to clean
> up are usually used to get rid of parasitic HF from a lead.
> A simple example would be to use it on a cable carrying DC or low
> frequency
> AC to keep it clean. It can be used on cables carrying non DC but
> care must
> be taken not to interfere with the AC signals or other type of
> signals that
> you do want to pass.
> Shielding, 90' crossing of wires which have to cross and good layout -
> should do it in most cases.
> I think though, that everyone is now thinking along the lines of
> software in
> Jon's problem - may need to shield that too:)
> Mo
> ]
>
>
> > A problem I had that drove me crazy was phantom steps. It seems that RF
> off
> > the drive circuitry was inducing a signal into the step wiring on one of
> my
> > axis. It was manifesting as lost steps when it really was
> unwanted steps.
> I
> > ended up curing this by shielding the wires in a wrap of
> aluminum foil and
> > grounding it at one end. Maybe you could also use ferrite filters?? (can
> one
> > of you electronic gurus help explain if this would be a useful method?
> Jon,
>
>
>
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