Re: MaxNC modifications

I never traced the exact source of the interference. I just shielded all the
wires from my junction board to the controller step, direction and ground
pins and when that worked I moved quickly to makin chips!!

I should have phrased my final statement differently as it was really adding
shielding, not more shielding that cured the problem as I originally had
unshielded hookup wire .

I don't think it was the parallel cable as that has not changed, I really
think it was just the wiring inside the controller case. The way I have it
set up is the case has a centronics connector bolted to it and I plug the
printer cable into it. From the back side of the centronics connector I have
22 ga hookup wire running to the ramped headers on the circuit board.

Tim
[Denver, CO]

> -----Original Message-----
> From: Mo [mailto:mo@...]
> Sent: Thursday, June 17, 1999 4:43 PM
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: Re: [CAD_CAM_EDM_DRO] MaxNC modifications
>
>
> From: "Mo" <mo@...>
>
> Tim,
> Did you every manage to pin down where the interference was coming from
> or what made the most difference?
> are all cables now shielded?
> What was the "more shielding" that smoothed out the motor and did you find
> the victim to be the parallel port cabling?
> Mo
>
>
>
> > I don't know if your problem is the same, but I had the same
> thing happen
> to
> > me as I increased the amps I started getting problems with lost steps on
> > curves. It was particularly bad with about a 1/2" radius and
> moving around
> 7
> > ipm. The step loss was quite consistent on the parts with curves, but I
> > could do slow or rapid moves along an axis all day long and the
> moves were
> > perfect with no steps lost. It ended up being a shielding problem. I
> thought
> > the interference was coming from the mosfets & heatsinks, but Jon made a
> > post and thinks it is from the circuit board (with his knowledge and
> > understanding I don't have much reason to disagree). Dan Falck posted
> about
> > having a similar problem as he upped the juice on his system also.
> >
> > The fact that your loss of steps increased as you upped the
> amps makes me
> > think you are experiencing the same type of thing. When I was lossing
> steps
> > I also would notice that the motor was running very ragged.
> More shielding
> > caused my step loss to go away and the motor started sounding much
> smoother
> > running.
>
>
>
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