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