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Posted by F. George McDuffee on April 5, 2008, 7:55 pm
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On Sat, 05 Apr 2008 13:22:40 -0400, Joseph Gwinn
<snip>
>The problem has been that I could not cut a 1.25" diameter mild steel
>bar off in the 3-jaw chuck without house-shaking chatter. This with a
>HSS T-blade 1/8" wide in an Aloris BXA-7 holder.
<snip>
=========
As you have discovered "parting off" or cut-off is one of the
more difficult lathe operations.
Many people use a cut-off tool upside down from the back of the
machine with good results. These are generally home made.
http://iwr.ru.ac.za/~iwdf/lathe/reartool.html
http://www.americanmachinist.com/304/Issue/Article/False/78007/Issue
kits are available
http://www.hemingwaykits.com/Catalogue%20130%20-%20Web%20Version.pdf
for a commercial version see
http://pdf.directindustry.com/pdf/kennametal/lathe-tooling-catalog-4010/7354-1120-_374.html
also see
http://mcduffee-associates.us/machining/rearcoth.htm
where we machined one as a class project.
Unka' George [George McDuffee]
-------------------------------------------
He that will not apply new remedies,
must expect new evils:
for Time is the greatest innovator: and
if Time, of course, alter things to the worse,
and wisdom and counsel shall not alter them to the better,
what shall be the end?
Francis Bacon (1561-1626), English philosopher, essayist, statesman.
Essays, "Of Innovations" (1597-1625).
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Posted by Joseph Gwinn on April 6, 2008, 4:03 pm
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> On Sat, 05 Apr 2008 13:22:40 -0400, Joseph Gwinn
> <snip>
> >The problem has been that I could not cut a 1.25" diameter mild steel
> >bar off in the 3-jaw chuck without house-shaking chatter. This with a
> >HSS T-blade 1/8" wide in an Aloris BXA-7 holder.
> <snip>
> =========
> As you have discovered "parting off" or cut-off is one of the
> more difficult lathe operations.
>
> Many people use a cut-off tool upside down from the back of the
> machine with good results. These are generally home made.
> http://iwr.ru.ac.za/~iwdf/lathe/reartool.html
> http://www.americanmachinist.com/304/Issue/Article/False/78007/Issue
>
> kits are available
> http://www.hemingwaykits.com/Catalogue%20130%20-%20Web%20Version.pdf
The problem with the 5914 is that the cross-slide won't go far enough
back to allow for two toolposts, and has just one T-slot. Apparently,
there is a two-slot cross-slide available for the Clausing 5900-series
lathes, but I have not seen one. DoN may have one.
> for a commercial version see
>
<http://pdf.directindustry.com/pdf/kennametal/lathe-tooling-catalog-4010/7354-1120-_374.html>
Man does Kennametal have a big catalog. What I didn't see was a
comparison of the advantages and disadvantages of the various methods of
holding inserts.
Joe Gwinn
> also see
> http://mcduffee-associates.us/machining/rearcoth.htm
> where we machined one as a class project.
>
>
>
>
> Unka' George [George McDuffee]
> -------------------------------------------
> He that will not apply new remedies,
> must expect new evils:
> for Time is the greatest innovator: and
> if Time, of course, alter things to the worse,
> and wisdom and counsel shall not alter them to the better,
> what shall be the end?
>
> Francis Bacon (1561-1626), English philosopher, essayist, statesman.
> Essays, "Of Innovations" (1597-1625).
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Posted by Mike Henry on April 6, 2008, 5:28 pm
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>
>> On Sat, 05 Apr 2008 13:22:40 -0400, Joseph Gwinn
>> <snip>
>> >The problem has been that I could not cut a 1.25" diameter mild steel
>> >bar off in the 3-jaw chuck without house-shaking chatter. This with a
>> >HSS T-blade 1/8" wide in an Aloris BXA-7 holder.
>> <snip>
>> =========
>> As you have discovered "parting off" or cut-off is one of the
>> more difficult lathe operations.
>>
>> Many people use a cut-off tool upside down from the back of the
>> machine with good results. These are generally home made.
>> http://iwr.ru.ac.za/~iwdf/lathe/reartool.html
>> http://www.americanmachinist.com/304/Issue/Article/False/78007/Issue
>>
>> kits are available
>> http://www.hemingwaykits.com/Catalogue%20130%20-%20Web%20Version.pdf
>
> The problem with the 5914 is that the cross-slide won't go far enough
> back to allow for two toolposts, and has just one T-slot. Apparently,
> there is a two-slot cross-slide available for the Clausing 5900-series
> lathes, but I have not seen one. DoN may have one.
>
>
<snip>
That sounds like the production cross slide, which was probably intended for
use with a bed turret. They came in two versions I think, those being
leadscrew and lever types. I've got the leadscrew type and never found the
need to try it, mostly as it seems best suited to production work and I'm
more into one-offs or very short runs.
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Posted by DoN. Nichols on April 7, 2008, 12:39 am
Please log in for more thread options >
[ ... ]
>> Many people use a cut-off tool upside down from the back of the
>> machine with good results. These are generally home made.
>> http://iwr.ru.ac.za/~iwdf/lathe/reartool.html
>> http://www.americanmachinist.com/304/Issue/Article/False/78007/Issue
>>
>> kits are available
>> http://www.hemingwaykits.com/Catalogue%20130%20-%20Web%20Version.pdf
>
> The problem with the 5914 is that the cross-slide won't go far enough
> back to allow for two toolposts, and has just one T-slot. Apparently,
> there is a two-slot cross-slide available for the Clausing 5900-series
> lathes, but I have not seen one. DoN may have one.
Don't I wish! I've only seen them in an old catalog which was
scanned for me.
>> for a commercial version see
>>
<http://pdf.directindustry.com/pdf/kennametal/lathe-tooling-catalog-4010/7354-1120-_374.html>
>
> Man does Kennametal have a big catalog. What I didn't see was a
> comparison of the advantages and disadvantages of the various methods of
> holding inserts.
Typically, I think that you pick a system which matches what you
already have. At least that is what I did -- starting with a couple of
good holder from eBay auctions along with 100 matching inserts for each. :-)
Enjoy,
DoN.
--
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---
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Posted by Joseph Gwinn on April 7, 2008, 9:55 pm
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> >
>
> [ ... ]
>
> >> Many people use a cut-off tool upside down from the back of the
> >> machine with good results. These are generally home made.
> >> http://iwr.ru.ac.za/~iwdf/lathe/reartool.html
> >> http://www.americanmachinist.com/304/Issue/Article/False/78007/Issue
> >>
> >> kits are available
> >> http://www.hemingwaykits.com/Catalogue%20130%20-%20Web%20Version.pdf
> >
> > The problem with the 5914 is that the cross-slide won't go far enough
> > back to allow for two toolposts, and has just one T-slot. Apparently,
> > there is a two-slot cross-slide available for the Clausing 5900-series
> > lathes, but I have not seen one. DoN may have one.
>
> Don't I wish! I've only seen them in an old catalog which was
> scanned for me.
Hmm. Maybe someday.
> >> for a commercial version see
> >> <http://pdf.directindustry.com/pdf/kennametal/lathe-tooling-catalog-4010/73
> >> 54-1120-_374.html>
> >
> > Man does Kennametal have a big catalog. What I didn't see was a
> > comparison of the advantages and disadvantages of the various methods of
> > holding inserts.
>
> Typically, I think that you pick a system which matches what you
> already have. At least that is what I did -- starting with a couple of
> good holder from eBay auctions along with 100 matching inserts for each. :-)
I'm leaning towards buying new, not wanting to wait a year to get lucky.
Now you know that the day after I order the new item, three fine used
items will turn up on eBay, for a third the price.
Joe Gwinn
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>bar off in the 3-jaw chuck without house-shaking chatter. This with a
>HSS T-blade 1/8" wide in an Aloris BXA-7 holder.