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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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turning copper
Any hints for turning pure copper?
I tried a medium positive rake, very sharp tool, fine feed, and high speed, but that broke the tool (and the expensive workpiece) when it dug in, and a negative rake doesn't cut, it just rubs (and probably work-hardens too). Lathe is about as tight as I can get it, overhangs as short as possible. I'm turning the soft state, but I could perhaps heat-treat it somehow if that would help. I can't work-harden the piece first though. Neither can I use much tool pressure - it's a diffusion-brazed assembly of thin pieces. Thanks, -- Peter Fairbrother |
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Peter Fairbrother wrote in
: Any hints for turning pure copper? I tried a medium positive rake, very sharp tool, fine feed, and high speed, but that broke the tool (and the expensive workpiece) when it dug in, and a negative rake doesn't cut, it just rubs (and probably work-hardens too). Lathe is about as tight as I can get it, overhangs as short as possible. I'm turning the soft state, but I could perhaps heat-treat it somehow if that would help. I can't work-harden the piece first though. Neither can I use much tool pressure - it's a diffusion-brazed assembly of thin pieces. Thanks, Try a pcd (diamond) insert. -- Anthony You can't 'idiot proof' anything....every time you try, they just make better idiots. Remove sp to reply via email |
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Peter Fairbrother wrote:
Any hints for turning pure copper? I tried a medium positive rake, very sharp tool, fine feed, and high speed, but that broke the tool (and the expensive workpiece) when it dug in, and a negative rake doesn't cut, it just rubs (and probably work-hardens too). Lathe is about as tight as I can get it, overhangs as short as possible. I'm turning the soft state, but I could perhaps heat-treat it somehow if that would help. I can't work-harden the piece first though. Neither can I use much tool pressure - it's a diffusion-brazed assembly of thin pieces. Thanks, Use a constant flood of any kind of coolant/lubricant or it will gum up. |
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Any hints for turning pure copper?
I tried a medium positive rake, very sharp tool, fine feed, and high speed, but that broke the tool (and the expensive workpiece) when it dug in, and a negative rake doesn't cut, it just rubs (and probably work-hardens too). Lathe is about as tight as I can get it, overhangs as short as possible. I'm turning the soft state, but I could perhaps heat-treat it somehow if that would help. I can't work-harden the piece first though. Neither can I use much tool pressure - it's a diffusion-brazed assembly of thin pieces. Thanks, -- Peter Fairbrother Guy Lautard recommended *milk*.... I've tried it, and it works nice. Ken. |
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I turn a fair bit of copper to make electrodes for EDM...
I always use HSS, very sharp, 0 rake angle, mist set so heavy its almost flood. Hi speed, low feed. Karl "Peter Fairbrother" wrote in message ... Any hints for turning pure copper? I tried a medium positive rake, very sharp tool, fine feed, and high speed, but that broke the tool (and the expensive workpiece) when it dug in, and a negative rake doesn't cut, it just rubs (and probably work-hardens too). Lathe is about as tight as I can get it, overhangs as short as possible. I'm turning the soft state, but I could perhaps heat-treat it somehow if that would help. I can't work-harden the piece first though. Neither can I use much tool pressure - it's a diffusion-brazed assembly of thin pieces. Thanks, -- Peter Fairbrother |
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Ken Sterling wrote:
--=20 Peter Fairbrother =20 Guy Lautard recommended *milk*.... I've tried it, and it works nice. Ken. =20 So how do you know this Guy Lautard fellow - I have a copy of his=20 Bedside reader here... Is that where you saw it? --=20 Will R. Jewel Boxes and Wood Art http://woodwork.pmccl.com The power of accurate observation is commonly called cynicism by those=20 who have not got it.=94 George Bernard Shaw |
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Whole or skim? Seriously--could make a diff!
Didn't someone around here once suggest freezing copper before turning it?? To stave off work hardening? Seemed like a neat idear. ---------------------------- Mr. P.V.'d formerly Droll Troll Ken Sterling (Ken Sterling) wrote in message ... Any hints for turning pure copper? I tried a medium positive rake, very sharp tool, fine feed, and high speed, but that broke the tool (and the expensive workpiece) when it dug in, and a negative rake doesn't cut, it just rubs (and probably work-hardens too). Lathe is about as tight as I can get it, overhangs as short as possible. I'm turning the soft state, but I could perhaps heat-treat it somehow if that would help. I can't work-harden the piece first though. Neither can I use much tool pressure - it's a diffusion-brazed assembly of thin pieces. Thanks, -- Peter Fairbrother Guy Lautard recommended *milk*.... I've tried it, and it works nice. Ken. |
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Peter Fairbrother wrote: Any hints for turning pure copper? I tried a medium positive rake, very sharp tool, fine feed, and high speed, but that broke the tool (and the expensive workpiece) when it dug in, and a negative rake doesn't cut, it just rubs (and probably work-hardens too). Lathe is about as tight as I can get it, overhangs as short as possible. I'm turning the soft state, but I could perhaps heat-treat it somehow if that would help. I can't work-harden the piece first though. Neither can I use much tool pressure - it's a diffusion-brazed assembly of thin pieces. Thanks, -- Peter Fairbrother Like the other guy said, 0 degrees rake, basically a flat top tool. Any positive rake will hog in, as you've found out. I've turned a lot of commutators and usually take off about .005" at the most with that interrupted cut. I haven't had to use any coolant. I use HSS and use a diamond hone on the tool to polish before using it. Feed slowly and don't get in a hurry and the finish comes out just fine. A round-nose tool helps, too. Make sure it's dead on center, too high or low is as bad as having rake. If you've got bucks and need the finest finish, use a diamond. I saw a picture of a copper drum that was turned with a diamond for some special optical purpose, looked like a mirror. The only heat-treat possible with copper is to anneal it. Stan |
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Ken Sterling wrote:
--=20 Peter Fairbrother =20 Guy Lautard recommended *milk*.... I've tried it, and it works nice. Ken. =20 So how do you know this Guy Lautard fellow - I have a copy of his=20 Bedside reader here... Is that where you saw it? --=20 Will R. Jewel Boxes and Wood Art http://woodwork.pmccl.com The power of accurate observation is commonly called cynicism by those=20 who have not got it.=94 George Bernard Shaw Yup - one of the bedside readers..... I've got 'em all and just keep re-reading them over and over - maybe because I enjoy them or maybe because it just doesn't sink in :-) Ken. |
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Peter Fairbrother wrote:
Any hints for turning pure copper? Use d-limonene for cutting fluid. Works a treat for copper and aluminum alloys. Any of the more concentrated citrus cleaners will work if you can't find the pure stuff. I recently turned a commutator using it. I've turned many comutators over the years and have never had one come out as nice as that one. Ted |
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Ken Sterling wrote:
Ken Sterling wrote: --=3D20 Peter Fairbrother =3D20 Guy Lautard recommended *milk*.... I've tried it, and it works nice. Ken. =3D20 So how do you know this Guy Lautard fellow - I have a copy of his=3D20= Bedside reader here... Is that where you saw it? --=3D20 Will R. =20 Yup - one of the bedside readers..... I've got 'em all and just keep re-reading them over and over - maybe because I enjoy them or maybe because it just doesn't sink in :-) Ken. =20 Did a bit of work on those books. :-) The software wasn't really up to it when he did the first book -- but it = got better and so did he. =2E..another lifetime I guess. His buddy Jack introduced us. --=20 Will R. Jewel Boxes and Wood Art http://woodwork.pmccl.com The power of accurate observation is commonly called cynicism by those=20 who have not got it.=94 George Bernard Shaw |
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Ken Sterling wrote:
Ken Sterling wrote: --=3D20 Peter Fairbrother =3D20 Guy Lautard recommended *milk*.... I've tried it, and it works nice. Ken. =3D20 So how do you know this Guy Lautard fellow - I have a copy of his=3D20= Bedside reader here... Is that where you saw it? --=3D20 Will R. =20 Yup - one of the bedside readers..... I've got 'em all and just keep re-reading them over and over - maybe because I enjoy them or maybe because it just doesn't sink in :-) Ken. =20 Did a bit of work on those books. :-) The software wasn't really up to it when he did the first book -- but it = got better and so did he. =2E..another lifetime I guess. His buddy Jack introduced us. --=20 Will R. Jewel Boxes and Wood Art http://woodwork.pmccl.com The power of accurate observation is commonly called cynicism by those=20 who have not got it.=94 George Bernard Shaw Great books just to have around for "enjoyment" reading... been through mine dozens of times and it seems I learn more each time. Well worth the bucks spent - for entertainment value alone :-) Ken. |
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