|
Posted by Wayne on September 29, 2008, 6:34 pm
Please log in for more thread options
A friend at work has a wine press which needs some help. The internal
threads of a piece that moves up and down on an acme thread are
damaged.
I've been unsuccesful at getting him to bring it so I can measure it.
Through other methods it appears to be 1.25 x 3 TPI (or possibly
M32 x 8.5). I haven't been able to find any sources for any acme
nuts of that size. The lowest the my lathe will go is to 4 TPI.
It will also do 6 or 9 TPI.
Is there anyway to fudge a 3 TPI?
Wayne D.
|
|
Posted by Pete Keillor on September 29, 2008, 6:52 pm
Please log in for more thread options
wrote:
>A friend at work has a wine press which needs some help. The internal
>threads of a piece that moves up and down on an acme thread are
>damaged.
>I've been unsuccesful at getting him to bring it so I can measure it.
>Through other methods it appears to be 1.25 x 3 TPI (or possibly
>M32 x 8.5). I haven't been able to find any sources for any acme
>nuts of that size. The lowest the my lathe will go is to 4 TPI.
>It will also do 6 or 9 TPI.
>Is there anyway to fudge a 3 TPI?
>
>Wayne D.
>
Mine switches from 9 to 4-1/2 tpi by switching from a 24 tooth stud
gear to a 48 tooth. If I could find a 72 tooth, that'd cut 3 tpi.
Pete Keillor
|
|
Posted by Wayne on October 1, 2008, 4:37 pm
Please log in for more thread options
Pete Keillor explained :
> wrote:
>
>> A friend at work has a wine press which needs some help. The internal
>> threads of a piece that moves up and down on an acme thread are
>> damaged.
>> I've been unsuccesful at getting him to bring it so I can measure it.
>> Through other methods it appears to be 1.25 x 3 TPI (or possibly
>> M32 x 8.5). I haven't been able to find any sources for any acme
>> nuts of that size. The lowest the my lathe will go is to 4 TPI.
>> It will also do 6 or 9 TPI.
>> Is there anyway to fudge a 3 TPI?
>>
>> Wayne D.
>>
> Mine switches from 9 to 4-1/2 tpi by switching from a 24 tooth stud
> gear to a 48 tooth. If I could find a 72 tooth, that'd cut 3 tpi.
>
> Pete Keillor
I don't think I'd get into looking for different gears for a one off
project such as this one.
Wayne D.
|
|
Posted by F. George McDuffee on September 29, 2008, 6:54 pm
Please log in for more thread options
On Mon, 29 Sep 2008 17:34:30 -0500, Wayne
>A friend at work has a wine press which needs some help. The internal
>threads of a piece that moves up and down on an acme thread are
>damaged.
>I've been unsuccesful at getting him to bring it so I can measure it.
>Through other methods it appears to be 1.25 x 3 TPI (or possibly
>M32 x 8.5). I haven't been able to find any sources for any acme
>nuts of that size. The lowest the my lathe will go is to 4 TPI.
>It will also do 6 or 9 TPI.
>Is there anyway to fudge a 3 TPI?
>
>Wayne D.
>
==========
It depends on your lathe, and what change gears you have, can buy
or can make. Even with a quick change box you can generally
change some external gears between the spindle and box and get a
whole other range of threads.
Bear in mind that your thread dial may not work with the new
gears and you will have to leave the half nut engaged. Also note
that cutting 3 TPI with a 8 TPI lead screw requires the lead
screw revolve about 3 times [8/3s] faster than the spindle and
this can be a considerable load/strain on the gear train. Some
of the old old lathes had a set up to drive the lead screw to
reduce the strain for very course pitch threads. Acme threads
are tough anyhow so take it easy.
A good reference is http://lindsaybks.com/bks7/sscut/index.html @
$4.95
Let the group know how your make out and good luck.
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).
|
|
Posted by Wayne on October 1, 2008, 4:55 pm
Please log in for more thread options
F. George McDuffee was thinking very hard :
> On Mon, 29 Sep 2008 17:34:30 -0500, Wayne
>
>> A friend at work has a wine press which needs some help. The internal
>> threads of a piece that moves up and down on an acme thread are
>> damaged.
>> I've been unsuccesful at getting him to bring it so I can measure it.
>> Through other methods it appears to be 1.25 x 3 TPI (or possibly
>> M32 x 8.5). I haven't been able to find any sources for any acme
>> nuts of that size. The lowest the my lathe will go is to 4 TPI.
>> It will also do 6 or 9 TPI.
>> Is there anyway to fudge a 3 TPI?
>>
>> Wayne D.
>>
> ==========
> It depends on your lathe, and what change gears you have, can buy
> or can make. Even with a quick change box you can generally
> change some external gears between the spindle and box and get a
> whole other range of threads.
>
> Bear in mind that your thread dial may not work with the new
> gears and you will have to leave the half nut engaged. Also note
> that cutting 3 TPI with a 8 TPI lead screw requires the lead
> screw revolve about 3 times [8/3s] faster than the spindle and
> this can be a considerable load/strain on the gear train. Some
> of the old old lathes had a set up to drive the lead screw to
> reduce the strain for very course pitch threads. Acme threads
> are tough anyhow so take it easy.
>
> A good reference is http://lindsaybks.com/bks7/sscut/index.html @
> $4.95
>
> Let the group know how your make out and good luck.
>
>
> 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).
Thanks for the input. Everything I do seems to take a long time.
I have started experimenting taking bigger cuts, but still am
conservative. I'd never make it in the real world of machining.
So if I tried an inside acme thread it'd probably be a day
or 2 project for me.
Wayne D.
|
| Similar Threads | Posted | | Re: Another 4-start thread question - 1/4" internal thread | April 2, 2006, 5:25 pm |
| class of thread fit on studs and all-thread | January 23, 2007, 10:18 am |
| acme rod/nut refurbish? | September 20, 2006, 11:51 am |
| 1/2 X 8TPI Acme | September 20, 2007, 10:24 am |
| Re: WTB-Rent 7/8-5 Acme tap | May 1, 2006, 12:59 pm |
| Re: WTB-Rent 7/8-5 Acme tap | April 29, 2006, 11:40 pm |
| Acme threaded stuff | November 10, 2006, 5:05 pm |
| Acme screw and way lubrication | May 7, 2006, 6:51 pm |
| ACME coventry chasers | May 1, 2006, 4:48 am |
| Brass ACME nut repair | July 14, 2008, 11:36 am |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
>threads of a piece that moves up and down on an acme thread are
>damaged.
>I've been unsuccesful at getting him to bring it so I can measure it.
>Through other methods it appears to be 1.25 x 3 TPI (or possibly
>M32 x 8.5). I haven't been able to find any sources for any acme
>nuts of that size. The lowest the my lathe will go is to 4 TPI.
>It will also do 6 or 9 TPI.
>Is there anyway to fudge a 3 TPI?
>
>Wayne D.
>