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Lew Hartswick
Guest
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 Posted: Wed Aug 30, 2006 4:08 am Post subject: Threading dies (hand type) |
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Is there such a thing as a "bottoming" die ?
One that will cut threads up to (at least a lot closer than
a "common" one ) a shoulder ? Sometimes while threading on
a lathe (male threads) even with a stop groove the thread
isn't either deep enough or some other minor distortion
occurs which could be cleaned up with a die but the partial
start threads on the die won't get close enough to the
shoulder.
Any suggestions short of grinding the first, about 3, threads
off a regular die ?
Thanks
...lew... |
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F. George McDuffee
Guest
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| Posted: Wed Aug 30, 2006 4:28 am Post subject: Re: Threading dies (hand type) |
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On Tue, 29 Aug 2006 23:08:48 GMT, Lew Hartswick
<lhartswick@earthlink.net> wrote:
| Quote: | Is there such a thing as a "bottoming" die ?
One that will cut threads up to (at least a lot closer than
a "common" one ) a shoulder ? Sometimes while threading on
a lathe (male threads) even with a stop groove the thread
isn't either deep enough or some other minor distortion
occurs which could be cleaned up with a die but the partial
start threads on the die won't get close enough to the
shoulder.
Any suggestions short of grinding the first, about 3, threads
off a regular die ?
Thanks
...lew...
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Try turning the die over. On some dies the threads don't have
any lead taper on the back side. Cut as much as you can with the
die in the regular position and flip for that last 1/4 or 1/2
turn.
Unka George (George McDuffee)
=============================
When you give power to an executive
you do not know who will be filling
that position when the time of crisis comes.
Ernest Hemingway (1899-1961), U.S. author.
"Notes on the Next War: A Serious Topical Letter,"
in Esquire (New York, Sept. 1935; repr.
in By-Line Ernest Hemingway, ed. by William White, 1967). |
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Ned Simmons
Guest
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| Posted: Wed Aug 30, 2006 4:38 am Post subject: Re: Threading dies (hand type) |
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In article <4O3Jg.198$v%4.163@newsread1.news.pas.earthlink.net>,
lhartswick@earthlink.net says...
| Quote: | Is there such a thing as a "bottoming" die ?
One that will cut threads up to (at least a lot closer than
a "common" one ) a shoulder ? Sometimes while threading on
a lathe (male threads) even with a stop groove the thread
isn't either deep enough or some other minor distortion
occurs which could be cleaned up with a die but the partial
start threads on the die won't get close enough to the
shoulder.
Any suggestions short of grinding the first, about 3, threads
off a regular die ?
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Flip the die over.
Ned Simmons |
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Dave Hinz
Guest
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| Posted: Wed Aug 30, 2006 4:55 am Post subject: Re: Threading dies (hand type) |
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On Tue, 29 Aug 2006 23:08:48 GMT, Lew Hartswick <lhartswick@earthlink.net> wrote:
| Quote: | Is there such a thing as a "bottoming" die ?
One that will cut threads up to (at least a lot closer than
a "common" one ) a shoulder ?
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I've done this in the past by just turning my regular die upside-down
after doing most of the work the "right" way. No idea if I'm offending
the metalworking gods by doing so, but it works for me.
Dave Hinz |
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Harold and Susan Vordos
Guest
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| Posted: Wed Aug 30, 2006 5:19 am Post subject: Re: Threading dies (hand type) |
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"Ned Simmons" <news@nedsim.com> wrote in message
news:MPG.1f5e9a028059c8e8989cd1@news.suscom-maine.net...
| Quote: | In article <4O3Jg.198$v%4.163@newsread1.news.pas.earthlink.net>,
lhartswick@earthlink.net says...
Is there such a thing as a "bottoming" die ?
One that will cut threads up to (at least a lot closer than
a "common" one ) a shoulder ? Sometimes while threading on
a lathe (male threads) even with a stop groove the thread
isn't either deep enough or some other minor distortion
occurs which could be cleaned up with a die but the partial
start threads on the die won't get close enough to the
shoulder.
Any suggestions short of grinding the first, about 3, threads
off a regular die ?
Flip the die over.
Ned Simmons
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And if that doesn't provide a full thread, it's acceptable practice to grind
the back side away enough to achieve a thread right to a shoulder. Only
problem is the die will be inclined to chip, so it's not a good idea if
you're threading tough materials.
Harold |
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Tony
Guest
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| Posted: Wed Aug 30, 2006 5:20 am Post subject: Re: Threading dies (hand type) |
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ummm, turn the die around?
"Lew Hartswick" <lhartswick@earthlink.net> wrote in message
news:4O3Jg.198$v%4.163@newsread1.news.pas.earthlink.net...
| Quote: | Is there such a thing as a "bottoming" die ?
One that will cut threads up to (at least a lot closer than
a "common" one ) a shoulder ? Sometimes while threading on
a lathe (male threads) even with a stop groove the thread
isn't either deep enough or some other minor distortion
occurs which could be cleaned up with a die but the partial
start threads on the die won't get close enough to the
shoulder.
Any suggestions short of grinding the first, about 3, threads
off a regular die ?
Thanks
...lew... |
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Guest
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| Posted: Wed Aug 30, 2006 9:42 pm Post subject: Re: Threading dies (hand type) |
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Lew Hartswick wrote:
| Quote: | Is there such a thing as a "bottoming" die ?
One that will cut threads up to (at least a lot closer than
a "common" one ) a shoulder ? Sometimes while threading on
a lathe (male threads) even with a stop groove the thread
isn't either deep enough or some other minor distortion
occurs which could be cleaned up with a die but the partial
start threads on the die won't get close enough to the
shoulder.
Any suggestions short of grinding the first, about 3, threads
off a regular die ?
Thanks
...lew...
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And if you flip the die over to run the threads up to a shoulder, you
end up with a nice stress-riser. After having a few of these type
projects shear threads at that point, I got the message. Either bore
and tap for a hardened roll-threaded stud or use a through-bolt.
Stan |
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Robert Swinney
Guest
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| Posted: Thu Aug 31, 2006 12:23 am Post subject: Re: Threading dies (hand type) |
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Tony sez:
" ummm, turn the die around?"
Yeah, Tony. That's what numerous respondents said. Why are you questioning
it ? Have you read so many of Iggy's posts that you want to imitate him?
It doesn't become you.
Bob Swinney |
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Nick Müller
Guest
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| Posted: Thu Aug 31, 2006 12:24 am Post subject: Re: Threading dies (hand type) |
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Robert Swinney <judybob@comcast.net> wrote:
| Quote: | Yeah, Tony. That's what numerous respondents said. Why are you questioning
it ?
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The strange thing here is, that _none_ of my dies have a flat and
tapered side. They are all identical on both sides.
Nick
--
The modular DRO
<http://www.yadro.de> |
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David Billington
Guest
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| Posted: Thu Aug 31, 2006 3:24 am Post subject: Re: Threading dies (hand type) |
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None of my dies have a flat and tapered side either but one side has
more of a lead in than the other. Best to check the details from the die
supplier, I haven't got a link to hand for the dies I have but IIRC the
greatest lead in is one the marked face. Having looked up the details
before the recommendation was to use the side with the greatest lead in
for best die life, if threading closer to the shoulder was required then
the other side of the die could be used to do the last bit. I must say
that on general inspection the difference in lead in was not obvious so
I used the side indicated by the maker.
Nick Müller wrote:
| Quote: | Robert Swinney <judybob@comcast.net> wrote:
Yeah, Tony. That's what numerous respondents said. Why are you questioning
it ?
The strange thing here is, that _none_ of my dies have a flat and
tapered side. They are all identical on both sides.
Nick
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