Engraving: remove material left over in the middle

[Anonymous]

Hello!

I am engraving a pattern in wood, the surfaces to be engraved are partially larger than the v-bit. This results in material being left over in the center of the respective surfaces. What is the best approach to get rid of those? Using a regular end mill won't work, es the edges are not sharp as compared to the v-bit. 3D adaptive clearing also does not work, as the nice sharp edges created by engravig are not present.

The v-bit hast a top diameter of 4mm, bottom diameter of 0.2mm and a 30° angle.

The pictures show the geometry I'm using to create the engraving and the simulated material. I highlighted some of the material I want to remove in red.

Thanks in advance and best regards.

[Cave_Master]

Have you tried using a pocket toolpath?  Can you post the file?

[Anonymous]

I have now, but that does also not work as desired. Compared to the engrave function, the edges are not properly cut, see the attached picture. I also attached the file. Thanks.

[laroot]

You know the bits angle and the depth you're cutting to.  Calculate the offset where the angled face meets the bottom.  So, can you set that distance as the "stock to leave funciton and use pocket clearing.

[Cave_Master]

There probably is an easier way but I think adjusing a pocket and if possible running a test part would work.   I would 

[laroot]

Simpler?  He formed the cavity with the V-groove tool:  change change functions and do a pocket clearing action rather than an engraving action?

[daniel_lyall]

What you are after is something that gets asked for every now and then, a flat depth what is the material left at the bottom of a v carve being removed, using stock to leave(as has been said) or modeling the toolpath is the only way around it.

[Anonymous]

Oh man, that's it! Thanks alot to all of you!

I already did pockets with an offset, but I only though of using my regular 1,5mm end mill, instead of the v-bit itself.

It worked like a charm, see the pic 🙂 (I went to deep into the material, so the top edged are not always straight, but that's onme). BR