Re: [CAD_CAM_EDM_DRO] Re: Thread milling
Posted by
R Rogers
on 2004-12-09 22:04:45 UTC
Robert Lyman <robsheplyman@...> wrote:
R Rogers wrote:
////I was taught and its common knowledge within the ranks that there is no such thing as a size range on collets. Collets are ground to specific diameter. Using them on any other diameter will disfigure them and is referred to as "the cardinal sin of collets". Installing a larger or smaller than intended diameter in their bore will result in 3 points of contact within the spindle and risk triangulating the taper. To hold a tap shank which none of them are nominal, simply make an adapter in the lathe with a nominal O.D and setscrew to secure. There are some commercially available with collapsible collets like tapmatic uses if memory serves me correct.
Ron
There are dozens of various collet designs,
///"standard collets" was the topic.
some of which have a set size, some have an acceptable grip range. Many old school machinists say to never use collets with taps or end mills, yet I work in an aerospace shop where we use collets with end mills and taps 16hrs a day, six days a week. They hold tight tolerances (+/- .0002) and thread mill almost daily. For many threads, odd fine internal threads on large diameters, thread milling is the feasable way to get it done. Have any of you seen a 4"-32tpi tap laying around, and if you have, what do you chuck it up in?
///The square on its end is for a handle/wrench. The center in its end is for a machining center to align it. Its wasn't designed to be "chucked". Nothing wrong with threadmilling. End mills in "standard" collets are bad about pulling out under heavy loads. Of course in aluminum this isnt much of a problem. Steel, is a different story. large endmills removing heavy stock need to be in holders.
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R Rogers wrote:
////I was taught and its common knowledge within the ranks that there is no such thing as a size range on collets. Collets are ground to specific diameter. Using them on any other diameter will disfigure them and is referred to as "the cardinal sin of collets". Installing a larger or smaller than intended diameter in their bore will result in 3 points of contact within the spindle and risk triangulating the taper. To hold a tap shank which none of them are nominal, simply make an adapter in the lathe with a nominal O.D and setscrew to secure. There are some commercially available with collapsible collets like tapmatic uses if memory serves me correct.
Ron
There are dozens of various collet designs,
///"standard collets" was the topic.
some of which have a set size, some have an acceptable grip range. Many old school machinists say to never use collets with taps or end mills, yet I work in an aerospace shop where we use collets with end mills and taps 16hrs a day, six days a week. They hold tight tolerances (+/- .0002) and thread mill almost daily. For many threads, odd fine internal threads on large diameters, thread milling is the feasable way to get it done. Have any of you seen a 4"-32tpi tap laying around, and if you have, what do you chuck it up in?
///The square on its end is for a handle/wrench. The center in its end is for a machining center to align it. Its wasn't designed to be "chucked". Nothing wrong with threadmilling. End mills in "standard" collets are bad about pulling out under heavy loads. Of course in aluminum this isnt much of a problem. Steel, is a different story. large endmills removing heavy stock need to be in holders.
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Addresses:
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URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
http://www.metalworking.com/news_servers.html
http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
bill
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Discussion Thread
Drew Rogge
2001-03-29 12:54:19 UTC
Thread milling
Jon Elson
2001-03-29 16:01:09 UTC
Re: [CAD_CAM_EDM_DRO] Thread milling
Jon Elson
2001-03-29 16:05:03 UTC
Re: [CAD_CAM_EDM_DRO] Thread milling
Marcus
2001-03-29 16:12:17 UTC
Re: [CAD_CAM_EDM_DRO] Thread milling
Smoke
2001-03-29 16:51:32 UTC
Re: [CAD_CAM_EDM_DRO] Thread milling
Drew Rogge
2001-03-30 08:36:55 UTC
Re: [CAD_CAM_EDM_DRO] Thread milling
beer@s...
2001-03-30 12:49:28 UTC
Re: Thread milling
Jeff Jones
2004-12-09 09:20:10 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
metlmunchr
2004-12-09 11:19:35 UTC
Re: Thread milling
Andy Wander
2004-12-09 11:40:24 UTC
RE: [CAD_CAM_EDM_DRO] Re: Thread milling
Jeff Jones
2004-12-09 12:19:43 UTC
RE: [CAD_CAM_EDM_DRO] Re: Thread milling
Graham Stabler
2004-12-09 12:30:38 UTC
Re: Thread milling
Jon Anderson
2004-12-09 12:49:42 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
V FONG
2004-12-09 12:59:44 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
Jeff Jones
2004-12-09 13:00:46 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
Tom Hubin
2004-12-09 13:10:51 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
Jeff Jones
2004-12-09 13:37:44 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
Peter Renolds
2004-12-09 16:22:43 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
R Rogers
2004-12-09 16:53:11 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
Jon Anderson
2004-12-09 18:11:39 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
Andy Wander
2004-12-09 18:26:53 UTC
RE: [CAD_CAM_EDM_DRO] Re: Thread milling
Stephen Wille Padnos
2004-12-09 18:35:37 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
Robert Lyman
2004-12-09 19:49:04 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
cnc002@a...
2004-12-09 19:56:56 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
R Rogers
2004-12-09 21:35:49 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
R Rogers
2004-12-09 22:04:45 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
Jon Anderson
2004-12-09 23:03:31 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
Jeff Jones
2004-12-09 23:06:53 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
Torsten
2004-12-10 05:16:11 UTC
Re: Thread milling
Graham Stabler
2004-12-10 05:17:07 UTC
Re: Thread milling - collets etc off topic
John Meissner
2004-12-10 06:09:54 UTC
Re: Thread milling - collets etc off topic
Wayne
2004-12-10 06:56:43 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling - collets etc off topic
R Rogers
2004-12-10 07:24:15 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling
metlmunchr
2004-12-11 10:09:41 UTC
Re: Thread milling, and yeah, I know it's OT
wanliker@a...
2004-12-11 13:11:29 UTC
Re: [CAD_CAM_EDM_DRO] Re: Thread milling, and yeah, I know it's OT