Re: [CAD_CAM_EDM_DRO] Steppers "thunking"

Hi Ray:

A "thunk" every few seconds is typical of a system with a period need to do something that uses DMA access. In my experience, the most common is a network card set to "auto negotiate". Set your network card to "100MB fixed", that usually clears it up, its one of the few 5second intervals in Windows. It also makes windows a bit faster.
Optmising should be considered a last step when using MAch3, the vast majority never need to do it, (Ive never had to on my own machines..but I have had to set the network card on one machine to "fixed" speed.
It really sounds as if you have a 5 second "tick" in your timing..

Mach is pretty powerfull at stopping system interruptions, but its failing is that it cannot see a DMA transfer, DMA shuts down the CPU for the period of use and nothing in the system can see that, even though, as in the case of Mach3, it is the highest priority interrupt in the system..

Thanks,
Art
www.artofcnc.ca

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----- Original Message -----
From: Ackley, Ray (R.J.)
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Friday, October 13, 2006 11:39 AM
Subject: [CAD_CAM_EDM_DRO] Steppers "thunking"


Hi all,

I just got my Taig rig up and running last night (w/Xylotex 3-axis
driver) and I noticed my steppers "thunk" every few inches or so. I'm
pretty sure this is them missing a step or two. I'm not making anything
complicated yet though (mostly straight lines for testing) so I can't
tell for certain.

I'm pretty certain my drive voltage is set correctly for the steppers.
Is this more likely a problem with the drive voltage or maybe the power
supply itself?

Thanks,
Ray Ackley

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