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Why won't this Scallop generate?

Message 1 of 7
223 Views, 6 Replies

Why won't this Scallop generate?

In the attached Design, I am trying to cut a dreidel, using a 4-sided approach.  In the CAM, I'm doing three tool paths per side (can ignore the 3rd).  First an adaptive cut and then a scallop.  This works on my first setup, but for some reason the second setup won't generate the scallop toolpath.  I copy/pasted the toolpath from the first to the second, and then changed the bounding selection.  Any ideas what I've done wrong?


Here are some images that I hope help.  Happy to post more.  I used the compare-and-edit thing too, and all the settings seem the same.  f3d file attached.











Labels (3)
Message 2 of 7
in reply to: adamsd5

I don't think you are doing anything wrong, but for some reason it doesn't want to behave, if i turn off Avoid surfaces it generates fine(but gives you an undesirable result)


as a workaround, change the boundary to silhouette and it seems to work OK

Screenshot 2023-09-05 072610.png 

Message 3 of 7
in reply to: adamsd5

I've been working more on this, simplifying and trying different approaches.  Here is another attached f3d, where 3 of the 4 sides work properly, but the 4th Scallop path won't generate.  This time, the only difference is in the setup, where I change the axes.  I no longer use a selected path to bound the tool (to eliminate this as a source of error on my part).

Message 4 of 7
in reply to: a.laasW8M6T

Looks like we raced in our reply... I tried something similar and now 3 of the 4 work... care to take a look at the latest?  (I appreciate the help!)

Message 5 of 7
in reply to: adamsd5

On the shim side, I was able to get it to work by changing the Avoid surfaces selection from the entire object, to just the cylinder surface, and using the silhouette as suggested.  I guess I'm good to go now, but this seems like a bug.

Message 6 of 7
in reply to: adamsd5

It does seem to be an issue with a selected boundary and avoid/ touch surfaces, I'm not sure why, it may indeed be a bug like you say

Message 7 of 7
in reply to: adamsd5

Hi @adamsd5 and @a.laasW8M6T ,


Thanks for feedback. I don't see obvious reason why original scallop tolpath fails. I've created CAM-48211.

Oleg Tikhomirov
Software Engineer

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