Strange behavior od 3D toolpath - stl file

Hello all,

I have an issue and cannot resolve it.

3D model is imported stl. should look like this :

when make the 3D finsih toolpath from one side it looks ok :

But when I cut it around the outline is shows flattened areas around bent surfaces :

I am using outline vector with zero threshold as a base for cutting and 3D toolpaths. I cannot extend it much further, as there is an 110 mm drop on each side and the cutter is not that high.

What could be the issue ?
I can share my file but dont want to make it public, as it cannot be removed afterwards.

With best regards,

Miha

Upload the STL or the .c2d file?

I find that fully modeling the 3D part, then offsetting to the outside by the radius of the largest tool used, then successively insetting when using smaller tools yields the most predictable results.

Yes, the offset could help, I am however sceptical, as there is a straight drop on the edge, which is bigger than my cutter and the machine could collide as there is no max depth setting in finish path. . I will try options to minimize the burr if there is no other possible solution. I have sent you files in PM.

With best regards,

Miha

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one solution however could be, that i set material heigth to 50 mm and base heigth to -70 mm to get the machine to cut only 50 mm deep - than i can make an offset of 2 cm without a problem. :wink: That is a workaround if nothing else works.

OK, so a couple things. When you import a fully modeled STL for a 2 sided flip part, there is going to be a parting line. In a side / section view…

The solid model is represented by a heightmap, so the bottom of the part gets filled in

To center the object within the stock, add a base height.

To prevent the tool from diving to the table, also add a base element, but allow enough room for the ball mill to cut past the parting line

You may also want to add some tabs to keep the model stationary while cutting the 2nd side. I usually just model these in

Now when cut…

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Ok , i get the problem now.

I know what you mean with tabs and are normally used, but this time, as one side of the part is flat i intend to cut the flat side first and then glue the part down on that side and cut the other side .

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To expand on that, if modeling/cutting fully in the round, you will probably find MeshCAM more comfortable/applicable, at least compared to the current version of Carbide Create Pro.

Thank you . I wil try however to see what happens with -70 baseheigth and an offset 3d toolpath area. Will keep you posted. Thank you also for a suggestion. Will look into it, as I am not familiar with it at the moment.

BR Miha

Hello thank you all for your help. It worked with - baseheigth. With best regards,
Miha

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