Concave radius cutter

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- Proctologically ViolatedÂ©Â®
  
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posted
18 years ago

Sun, Jul 31, 2005 6:06 AM

Awl--

I'm using a std 3/8 radius concave cutter, 3/4 shank. The head is about 1" OD, which causes some clearance problems in my particular app. I would like to find one w/ an OD of 3/4 or 7/8, but w/ no luck so far.

Saw solid carbide concave radius cutters, where the cutting part is cut right into the shank--IOW, the whole tool is 1" OD, end to end--no neck, head, etc.

I know reducing the OD reduces the inner ID (web), and therefore the strength, but these are basically a finish-type cuts.

Iny idears? Someone suggested 1/4 radius cutter, in 2 passes, but this would be a pita. TIA.

---------------------------- Mr. P.V.'d formerly Droll Troll

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posted
18 years ago

Sun, Jul 31, 2005 3:50 PM

Hiya, PV, haven't seen ya in here for awhile. I'm hope you're talking metal here, and not wood, but I've got a suggestion depending on what is available to you. If you have a boring head, you may be able to grind a short cemented carbide boring bit (they are usually tapered for clearance) to your radius, set it as close as possible to center on your spindle (maybe even in the spindle itself), and start cutting. I would experiment to see it a single flute cutter like this would work, changing rpm and depth of cut to get an acceptable finish. Hopefully it's a softer material to avoid chatter. Just a suggestion. Ron

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posted
18 years ago

Sun, Jul 31, 2005 10:38 PM

Yeah, my isp *dropped rcm*, for months now, what an effing chore to get it and a few others back. We really are fish in a goddamm barrel....

Ackshooly, your suggestion is a very good one, and I had already made something like this in another application, but didn't quite put 2+2 together. It should be doable, iffin I can find someone to grind a nice radius for me. We got a cupla houses here in this neck of the woods, hopefully they won't break the bank. Tight fit, tho, overall.

What I would try to do here is take 5/8 drill rod, drill a 7/16" radial hole, and an axial threaded hole, to lock a 1" length of 1/2 carbide/hss/whatever, ground on both ends. Course, it would have to be really centered, if both ends are going to cut. Mebbe lock it in before sending it off for grinding, so *they* can grind both ends as a unit, guaranteeing centered-ness.

Man, if I could only just *buy* this goddammthing someplace. NOW ahm willing to pay top dollar!! Thanks!