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CNC toolpath glitches

5/10/21       
David Wildman Member

Hi all
I am having an issue with 3d toolpathing using Vcarve. I would describe these as glitches in the toolpaths of a 3d finish model. It appears in multiple parts at the same location so I don't think it is a function of loose parts. I think its either in the gcode or how the controller is processing the gcode. Vcarve software. Shopsabre/WINCNC controller. I can bondo these so no problem, but I have this show up occasionally on parts that I can't bondo and so it is something that I would like to remedy. Thanks in advance!


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5/10/21       #2: CNC toolpath glitches ...
Mark B

Obviously they are not showing up in your toolpath preview even with the resolution set to high? Not sure how the parts are modeled if they are being cut from an .stl? If so I would be very suspect of something bad in the mesh though if that were the case it would be repetitive on identical parts. We've done a lot with VCarve and never had any glitches that werent glitches.

5/10/21       #3: CNC toolpath glitches ...
Tom Gardiner

I suspect that your dust shoe is scoring the workpiece. These are not tool related. They look like an interference problem. Try running the part without the dust shoe on to see if anything else is like the collet nut might be too close

5/10/21       #4: CNC toolpath glitches ...
Mark B Member

Collet rubbing is a good catch though itd have to be a wee bitty little collet with a lot of spindle nose from the router for that lower one. Its so close to the floor but who knows on scale

5/10/21       #5: CNC toolpath glitches ...
David Wildman Member

Website: http://www.duvisst.com

Mark B. Thanks. It could be a problem with the STL but it is not showing up in any rendering or simulation. Object was modeled in Fusion 360 and then saved as an STL to use in Vcarve. I may try to CAM this in Fusion. Regarding dust shoe/collet rubbing it isn't that. I am running a longer tapered ballnose and so have more than adequate clearance. The part is smaller than the pictures would lead you to believe. Thanks again for responses.

5/11/21       #6: CNC toolpath glitches ...
james e mcgrew

Could be several things, Roughing bit ? part lift. Looks sharp edged not ball nose.

try flipping the file and run again to see if problem follows file?

5/11/21       #7: CNC toolpath glitches ...
Mark B

I have found some issue with Vcarve even on high res that if I have numerous parts on a job in a large nest even when zooming in I cant see an issue but if I copy/paste one of the parts into a new job that is very close to the part size (material size) and run it on high res it shows.

Again, not sure but as James said, pretty easy to track down.. if it repeats on the same part every time, repeats if the part is rotated, you pretty much know its in the file. Agree'd though that the problem looks a little odd depending on what tool your using.


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