RE: December build of EMC

Matt;

What drivers and motors are you using? I found that the large motors (like
those on the Boss 5) tend to have significantly more resonance problems with
bipolar chopper drivers than with the old L/R saturable reactor amplifiers.
I had to use microstepping amplifiers at 5 substeps minimum to get rid of
the resonance. The chopper drivers output a very harsh pulse which leads to
noisy movement.

Doug Harrison

> -----Original Message-----
> From: Matt Shaver [SMTP:mshaver@...]
> Sent: Monday, December 13, 1999 11:10 AM
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: Re: [CAD_CAM_EDM_DRO] December build of EMC
>
> From: "Matt Shaver" <mshaver@...>
>
> The 07-dec release was sort of an interim version Fred made for me to try
> out
> some new stepper motor code ideas. It didn't work for me either, but I do
> have some improvements you could try to patch in if you're interested. On
> Friday 10 Dec Fred brought an oscilloscope over to my shop and we spent 5
> or
> 6 hours experimenting with ways to improve the performance of my machine.
> As
> I have a full sized Bridgeport (big inertia), and resonance problems as
> well,
> my case is a tough one. We're now debating the next course of action,
> either
> continuing to try perfecting the present scheme or going with a whole new
> approach. If anyone out there has information on stepper motor drive
> algorithms, let us know!
>
> Thanks,
> Matt
>
> > Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
> discussion of shop built systems in the above catagories.
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