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CNC round-over bits with thin shank

Engineering Asked on September 1, 2021

I want to use a round-over bit on a CNC router after cutting a profile with a 3mm (1/8″) bit. So the round-over bit needs a shank thinner than that. I could only find shanks with 6mm (1/4″) diameter.

Do round-over bits with shanks thinner than 3mm (1/8″) exist? If not, what is the physical limitation that prevents it?

2 Answers

I found this CNC bit that seems to do the job:

1pc 6mm Shank Classical Round Nose Point Cut Wood Router Bit Tungsten Cobalt Alloy 2 Flute Wood Milling Cutters Woodworking Tool

CNC bit

I have not tested it because I don't have access to the CNC during the pandemic.

Answered by miguelmorin on September 1, 2021

Depending on the material, likely strength doesn't allow smaller ones. Regardless, depending on shape and gap width, you can do this with a larger tool, by driving it multiple times over the edge, with the tip in consecutive passes going through paths lying on a quarter-circle of radius equal to tool radius minus desired fillet radius. (if the tool has a flat tip, you need to add that flat tip radius to the path offset.)

Say, the upper-right shows the bit cross-section (well, half of it). With consecutive passes with tip offset at positions on the red line you achieve a fillet of a much narrower radius (blue overlaid by yellow). The only problem is if there are narrow gaps or the depth doesn't allow to lower the tool deep enough.

enter image description here

Answered by SF. on September 1, 2021

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