RE: [CAD_CAM_EDM_DRO] Still losing steps in M5 or Mach1

Hi Tom,

I have exactly the same problem with Master5 and my Camtronics 5AMP boards.
I cannot get smooth operation using Master5 no matter what I do to the
configuration with the Camtronics 5AMP drivers. I get somewhat smoother
operation with my CMD-260 drivers but they are configured for 2000 step per
rev micro stepping which may help. I get reasonable motion with a single
axis, but I cannot get it to machine a circle at all. I suppose I don't
have enough computer to make it run correctly, but my 266 MHz shop computer
runs EMC, DeskNC and TurboCNC just fine. I have other things in the shop
that I can spend $$$ on before I purchase a shop computer that is faster
than my general use PC. And for those that would tell me to put the new
machine in the house and the current one in the shop, Master5 does not run
correctly on my dual 450 Pentium machine, and neither does the BDI version
of EMC.

John Guenther
Sterling, Virginia

> -----Original Message-----
> From: kaynrc [mailto:tom.kay@...]
> Sent: Thursday, August 15, 2002 9:04 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Still losing steps in M5 or Mach1
>
>
> Hello all:
>
> I still seem to have rough motor running when simulating in 2D, a
> circle being cut using the x and y motors.
>
> They are new steppers, and 5 amp boards from Camtronics. I have
> gotten to the point where a "simulated" square works well. Motors run
> smoothly with little or no step loss. But that's different, in that
> one motor fully stops working, then another starts, with there never
> being 2 motors on at the same time. It seems to run well like that.
>
> But when I load in a circle, the motors will go through the motions,
> but run roughly. Sometimes even lock up and just squeal, not turn,
> even though the program runs through on Mach1. I seem to have better
> and somewhat smoother operation on Master5 then Mach1, which leads me
> to think I still have to learn how to tweak Mach1 better.
>
> But why am I still not able to run a smooth circle in a bench test? I
> have tried every combo of motor speed, pulses per inch (although I'd
> like to keep that set at 2000, which represents my future setup) and
> acceleration that I can think of, with varied results, but never
> smooth.
>
> I have made my own shielded parallel cable with twisted shielded
> pairs, and connected all of the shields to the computer casing at one
> end only.
>
> How important is it to shield the short low-power wires from the
> junction board to each driver?
> How important is it to plug the logic 5VDC supply into a different
> wall outlet then the 35VDC motor supply, thus avoiding a ground loop?
> I tried that, with no obvious improvement.
>
> I keep saying this, but progress IS being made. Single motions now
> seem quite smooth, even if a fews steps are lost here and there. I am
> hoping that once I hook the motors up to a mill table, the added drag
> will help filter out the last remaining step loss.
>
> Thanks for all help.
>
> Tom Kay.
>
>
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