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(02-13-2025, 01:17 PM)BrentDH Wrote: If I understand everything correctly, you want a 2mm wide mortise through material that is 4/5” thick and you want to cut it with a handheld router. This seems unlikely to be successful to me. Can you take a completely different approach? Rip the material at one edge of the mortise. Then cut a dado 2mm deep and however wide your mortise was to be. And then glue it back together.
Or drill it out most of the waste, and then use a regular router bit and a chisel to clean it up.
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02-13-2025, 10:43 PM
(This post was last modified: 02-13-2025, 10:44 PM by MstrCarpenter.)
(02-13-2025, 01:11 PM)Brian in sunny FL Wrote: Only bit that may be 2mm and cut through 5/4 would be high-speed steel. I am sure a carbide bit would snap. Small diameter bits are popular in dental and PCB manufacturing but not that long.
That's what I saw too, but on the O.P. it is 4/5, or a little less than 13/16". Still, a 5/64 mortise in anything that thick would be a tough ask. You would need many extremely accurate passes with no wiggle room for a clean-up pass. Yea, I think even on a Bridgeport it would be tough on anything much harder than Styrofoam.
Sign at N.E. Vocational School Cabinetmaking Shop 1976, "Free knowledge given daily... Bring your own container"
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Drill a sequence of holes with a #48 drill bit first and then clean out the slot with a small router.
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I have tried this drilling idea, but it is a bit difficult to maintain the desired line with the drilled holes. However what if I pre-groove the lines with a shorter router bit? For example 1mm wide goove with a short bit that is less prone to break. Then groove it again with a 4/5 long 2mm bit. So there won't be that much stress on this finalizing bit.
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(02-19-2025, 03:25 PM)Bencuri Wrote: I have tried this drilling idea, but it is a bit difficult to maintain the desired line with the drilled holes. However what if I pre-groove the lines with a shorter router bit? For example 1mm wide goove with a short bit that is less prone to break. Then groove it again with a 4/5 long 2mm bit. So there won't be that much stress on this finalizing bit.
It would help if we knew what you were making so we could suggest a different method . A router bit of that size cutting that thickness will not last long before breaking. Think how knife slots are made in a knife block, would that work ? Roly
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(02-12-2025, 07:10 AM)Bencuri Wrote: I need to cut narrow through mitters into hardwood. The mitter width should be 2mm (about 1/12"), and the thickness of the wood is 4/5". I found this router bit, but I am not sure if this is suitable indeed for the purpose?:
I have seen people cutting wood with those kind of router bits that look similar to a normal drill bit. But I found the side of the cuts were quite rough. That's why I tried to find a normal, straight type of bit.
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Also a milling cutter will do the job. You need a center cutting 4 flute , 1/2" shank x 1" flute depth. The cutter is probably over 2" long with the shank and flutes.
mike
