Simple Part - 2D contour - Empty Toolpath?

[bwerst71]

CAM Beginner having problems with the 2D contour operation.  I was able to do several similar thicker parts before so I'm not sure what I'm doing wrong this time.

Basically a partial circle out of ~3/8" .33 sheet of plywood.  I'm trying to use a 1/4" up spiral bit using multiple passes at ~.12 depth.  The contour shows around the bottom edge of the part with tabs.  The origin all appears okay.

I've attached a picture of the screen/part and the diagnostic log file.  I'm not sure how to upload the drawing/cam document(s).

[bwerst71]

Please forgive me if this isn't the right place method to post.  I've spent hours searching online through the forums and tried every combination of settings I could think of.  This is just one of many more parts I'm making for my daughters school play.

Here's the file link: https://a360.co/2NkxyYj

[engineguy]

@bwerst71 

This a known issue, there was a thread about it a few days ago, it has something to do with the sharp corner going from an arc edge to the straight edge,

A quick simple fix is to do two contours, one for the arc and one for the straight edge, not ideal I know but it will get the job done for you for now.

Regards

Rob

[daniel_lyall]

@engineguy  I found the workaround for it, do the 2 toolpaths like you said then save the sim of it then use that with a tool that is smaller and it works.

[samuel.baker]

Hey,

Have you tried using it as an open contour?
To do this simply select the contour again, and select open contour.
Then select the other area as a stock contour.
You can then put multiple passes on the tool-path in the passes tab.
That will then create multiple passes following the contour.

This can create a different style of tool-path which can sometimes be more useful.

Kind Regards

Sam

[daniel_lyall]

It looks like it has been fixed or the setting changes I did.

You have the tool plunging into the material and a suggestion changes the tab to triangular it is easier on the cutter and machine if it can ramp up and down when doing the tabs.

file attached for references.