Author Topic: Jerky movements in complex toolpaths.  (Read 4621 times)

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Offline jofriedl

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Re: Jerky movements in complex toolpaths.
« Reply #10 on: July 27, 2016, 11:53:19 PM »
well I heard back from CS labs. They said the difference in voltage shouldnt be an issue. The also suggested I change some parameters to help with servo tuning. While the servos ended up with a better tune when I was done, I have exactly the same issue. Essentially, When running a program, I end up with a following error 10 TIMES the amount of error I get when jogging back and forth at full speed.

I'm wondering If I should take the plunge and set the machine to run in mach4. I need thing thing to be able to haul ass and cut molds and I just don't see it ever performing close to what it did before I installed mach3. I'm submitted a service ticket to machsupport weeks ago and never heard back from them. I even emailed Brian directly but haven't heard back. I suppose he's busy.


Offline Tweakie.CNC

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Re: Jerky movements in complex toolpaths.
« Reply #11 on: July 28, 2016, 01:58:15 AM »
Just a wild thought and grasping at straws here but have you looked at your CAD/CAM generated toolpath - if it contains many short lines this could cause jerky motion (particularly with arcs and contours).

Tweakie.

(nothing to do with the problem but the diode, below the 3PR relay, appears to be connected incorrect polarity).
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline jofriedl

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Re: Jerky movements in complex toolpaths.
« Reply #12 on: July 28, 2016, 02:30:57 AM »
It definitely has lots of very short lines and arcs and contours. Shouldn't mach be able to handle that with look ahead and constant velocity?

Offline Tweakie.CNC

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Re: Jerky movements in complex toolpaths.
« Reply #13 on: July 28, 2016, 02:50:51 AM »
Well yes it should but I recently changed the aspect ratio of a previously produced milled panel contour and regenerated the toolpath (in CAD/CAM) – this converted all my nice smooth arcs into many straight lines – the result was terribly rough motion from my mill.
Mach3 is good but it’s not perfect and I ended up redrawing the panel to the new dimensions, recreating the toolpath then everything was bliss.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.