Question about inner corners (CNC)

[lineliscnc]

Hello,

I need to find a solution for corner as in the picture below (the picture shows the result that I want to achieve). When I am using R5mm bit the corner is round.

What are your thouhgts? What bit should I use and what should be the concept?

Looking foward for your thoughts.

Thanks.

[CitizenOfDreams]

Sorry, I can't see your attachments (probably because you don't have enough posts yet). Are you trying to make sharp 90-degree inner corners? That would not be possible with a round rotating tool.

You can either use a smaller end mill to make the corner radius as small as possible, or overcut the corners like this:

[lineliscnc]

Hm, ok I will try to explain.

Yes, I understand that it is not possible to make contour with square contours.

As an example: let's say that we use V shape 90 degrees bit and make bevel of 45 degrees all around contour of a rectangle.

Inside corners of that rectangle become round. We can fix it by taking out a bit in the corner. But if we use a bit that is not V shape 90 degrees, but let's say rounding bit R5, and take the same path, so the corners cant be fixed in the same way as with V shape bit. So the question again is how could it be made.

The point is to make an imitation of a kitchen cabinet door with half-rounded strip glued inside the door creating some kind of shaker door style. But there I have a problem with the corners as it looks not realistic.

[ger21]

You can use a much smaller tool to clean up the corners, but they'll still have a small radius.
Or, you can use a chisel and square them by hand.