RE: [CAD_CAM_EDM_DRO] Re: CNC Pulse jitter?

Tim,

I have tried to increase the speed and I can sometimes get it to run up to
about 20IPM but not reliably. These motors just won't run it that fast. I
will be changing the motors soon to some stronger units that have better
volt / amp ratings and higher torque.

John

> -----Original Message-----
> From: Tim Goldstein [mailto:timg@...]
> Sent: Wednesday, April 17, 2002 12:49 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Re: CNC Pulse jitter?
>
>
> John,
>
> Your speeds are too low to start seeing the problems with EMCs instable
> pulse train. On a AMD K6-300 I started to see the problem at about 60
> ipm (4000 steps per second) on my Shoptask with steppermod.o and at
> about 90 ipm (6000 sps) with freqmod.o. If I am figuring correctly you
> are only running at 2000 sps at the high-end. Try increasing the speed
> and you will see the problem. This is not to say that EMC is not more
> stable than some other software. When I moved from DeskNC DOS to EMC it
> was a big improvement.
>
> Tim
> [Denver, CO]
> http://www.ktmarketing.com/CNC.html
>
> > -----Original Message-----
> >
> > I am running a Pentium 266, 64MB RAM, 3.1GB drive, S3 video
> > card, floppy and CD-ROM. The machine is standalone with NO
> > networking, only sneaker net. I normally run steppermod.o
> > but have begun testing freqmod.o in the last few day. Normal
> > rapids under EMC are 12 to 15 IPM on a Sherline 5400 with
> > 20TPI leadscrews. Drivers are normally Camtronics 5AMP
> > Bipolar drivers at 35 volts. Steppers are Pacific Scientific
> > E21RFS-JSS-NS-03 8 wire motors coupled directly to the lead
> > screws. I cut steel, aluminum and brass with it without any
> > problems (so far).
> >
> > John Guenther
> > Sterling, Virginia
>
>
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