# How to do mitre cuts using 90* v-bits

Hello fellow cnc’rs.
Up to this point I’ve used my v-bits to do carvings. Now I need to learn on how to do miter cuts with .25’’ dia bit/s. My wood materials I use are anywhere from 1/2’’ - 1’'. Where I’m struggling is the programming/math calculation part of these cuts. Does anyone has a quick simple explanation/formula on how to approach these cuts?
Do I use profile toolpath, or do I need to do area clear-out?
I use Carveco maker. I know I can get big diameter bits, but it will not help me with understanding on how to program these with the smaller bit.
Thank you,
Andre

I am in the same situation. Please let me know if you figured out any solution. I couldn’t find video’s that go in detail.

I don’t use Carveco, but I’ve done it in V-Carve to make the hinged edge of pen boxes. Perhaps there’s some equivalent.
I select the edge where I want the miter and create a line offset from it inwards by the thickness of the material, or the desired depth of the miter. I use this line as the rail in the “Chamfer” toolpath. With a 90-degree V-bit, this quickly produces the desired cut. Here’s a couple of simulated pictures.

And one of my pen boxes, showing the bevel at the hinge point.

I hope this is of some help.

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@SailorMike How much of offset do you set on .75 thick wood?
Tnx
Andre

That’s the nice thing about 90 degree v-bits. 45 degrees on both sides of the rotation axis, so your offset will be equivalent to your depth (i.e. .75" offset for .75" material thickness).

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@DCK Thank you Dan, I’ll give it a try.

If you don’t have a chamfer tool in your software, you might try offsetting a line to the stock thickness to the outside of your edge and doing a profile cut on that line with the 90-deg V-bit. I haven’t tried that, so try it on a scrap piece first.

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Hi Andre, have you had a chance to try this? Did it work as expected?

Thx
Dave