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Posted by Den on July 24, 2008, 8:00 am
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I looking for some advice on how to improve my lathes 3 jaw chuck.
Without going out to the workshop to measure it, it's about 7" or 8"
diameter. The jaws are worn and when small diameter work is fitted it is a
off centre by ~0.020". Looking at the jaws I can see where they are flogged
out a little, particulary the outermost 10mm or so.
I occaisionally stick a drill bit or endmill cutter in the chuck and clamp
some work in a vertical mounted vice on the cross slide. I dont know if
gripping the hardened tools has contributed to the jaw wear.
What's the best way to clean them up. The chuck jaws allow external/outside
edge clamping - can I wind the jaws out and fit a ring and then run a boring
bar across the inside clamping surfaces of the jaws as someone here
mentioned a week or so back?
Cheers.
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Posted by spaco on July 24, 2008, 8:32 am
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20 thou is a lot. I'd seriously consider getting a new one. For
years I fought a 6" 3 jaw chuck that was about 6 thou out. I tried a
couple of the solutions that you no doubt will get from this post, but
they didn't work for me.
Finally, about 6 or 7 years ago I bought a brand new set-true chuck.
Even though it cost me $350 (3 times what I paid for the whole
(used)lathe 30 years ago, it was and is still worth it.
It has 0.0004" run out. I can simply throw stuff in there and cut
metal.
You may not need a 7 or 8 inch chuck. consider a 6" to hold the
cost down.
You may be right about hurting the jaws with a drill or end mill.
I'd also suggest getting a collet or two for holding them. End mills in
particular seem to pull out of the 3 jaw chuck.
Pete Stanaitis
------------------------------------
Den wrote:
> I looking for some advice on how to improve my lathes 3 jaw chuck.
>
> Without going out to the workshop to measure it, it's about 7" or 8"
> diameter. The jaws are worn and when small diameter work is fitted it is a
> off centre by ~0.020". Looking at the jaws I can see where they are flogged
> out a little, particulary the outermost 10mm or so.
>
> I occaisionally stick a drill bit or endmill cutter in the chuck and clamp
> some work in a vertical mounted vice on the cross slide. I dont know if
> gripping the hardened tools has contributed to the jaw wear.
>
> What's the best way to clean them up. The chuck jaws allow external/outside
> edge clamping - can I wind the jaws out and fit a ring and then run a boring
> bar across the inside clamping surfaces of the jaws as someone here
> mentioned a week or so back?
>
> Cheers.
>
>
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Posted by Andy Stall on July 24, 2008, 9:52 am
Please log in for more thread options spaco wrote:
> 20 thou is a lot. I'd seriously consider getting a new one. For
> years I fought a 6" 3 jaw chuck that was about 6 thou out. I tried a
> couple of the solutions that you no doubt will get from this post, but
> they didn't work for me.
> Finally, about 6 or 7 years ago I bought a brand new set-true chuck.
> Even though it cost me $350 (3 times what I paid for the whole
> (used)lathe 30 years ago, it was and is still worth it.
> It has 0.0004" run out. I can simply throw stuff in there and cut
> metal.
> You may not need a 7 or 8 inch chuck. consider a 6" to hold the cost
> down.
>
> You may be right about hurting the jaws with a drill or end mill. I'd
> also suggest getting a collet or two for holding them. End mills in
> particular seem to pull out of the 3 jaw chuck.
>
>
> Pete Stanaitis
Agree I do 90, no 95% of the stuff I do on a 6" 6 jaw set true on
a 13" lathe.
> ------------------------------------
> Den wrote:
>> I looking for some advice on how to improve my lathes 3 jaw chuck.
>>
>> Without going out to the workshop to measure it, it's about 7" or 8"
>> diameter. The jaws are worn and when small diameter work is fitted it
>> is a off centre by ~0.020". Looking at the jaws I can see where they
>> are flogged out a little, particulary the outermost 10mm or so.
>>
>> I occaisionally stick a drill bit or endmill cutter in the chuck and
>> clamp some work in a vertical mounted vice on the cross slide. I dont
>> know if gripping the hardened tools has contributed to the jaw wear.
>>
>> What's the best way to clean them up. The chuck jaws allow
>> external/outside edge clamping - can I wind the jaws out and fit a
>> ring and then run a boring bar across the inside clamping surfaces of
>> the jaws as someone here mentioned a week or so back?
>>
>> Cheers.
>>
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Posted by Stealth Pilot on July 24, 2008, 10:34 am
Please log in for more thread options wrote:
>20 thou is a lot. I'd seriously consider getting a new one. For
>years I fought a 6" 3 jaw chuck that was about 6 thou out. I tried a
>couple of the solutions that you no doubt will get from this post, but
>they didn't work for me.
> Finally, about 6 or 7 years ago I bought a brand new set-true chuck.
>Even though it cost me $350 (3 times what I paid for the whole
>(used)lathe 30 years ago, it was and is still worth it.
> It has 0.0004" run out. I can simply throw stuff in there and cut
>metal.
> You may not need a 7 or 8 inch chuck. consider a 6" to hold the
>cost down.
>
> You may be right about hurting the jaws with a drill or end mill.
>I'd also suggest getting a collet or two for holding them. End mills in
>particular seem to pull out of the 3 jaw chuck.
>
>
>Pete Stanaitis
>------------------------------------
>Den wrote:
>> I looking for some advice on how to improve my lathes 3 jaw chuck.
>>
>> Without going out to the workshop to measure it, it's about 7" or 8"
>> diameter. The jaws are worn and when small diameter work is fitted it is a
>> off centre by ~0.020". Looking at the jaws I can see where they are flogged
>> out a little, particulary the outermost 10mm or so.
>>
>> I occaisionally stick a drill bit or endmill cutter in the chuck and clamp
>> some work in a vertical mounted vice on the cross slide. I dont know if
>> gripping the hardened tools has contributed to the jaw wear.
>>
>> What's the best way to clean them up. The chuck jaws allow external/outside
>> edge clamping - can I wind the jaws out and fit a ring and then run a boring
>> bar across the inside clamping surfaces of the jaws as someone here
>> mentioned a week or so back?
>>
>> Cheers.
>>
>>
Den
I would recommend you making a trip over to HAFCO in Belmont and
buying a new chuck. Fuerda chucks are not expensive. They also have a
polish made chuck that is quite reasonable.
Google for Hare and Forbes or HAFCO on australian only pages, they
have a website with online cattledog.
(I bought 2 new ones for a Myford I'm restoring. they're not
expensive)
Stealth Pilot
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Posted by Jon on July 24, 2008, 11:32 am
Please log in for more thread options We have several Bison (Poland) 6- jaw set-tru chucks that are great
one of them saw daily production in a cnc lathe for years, you can't tell it
from new.
Parts are available for the occasional oops.
=)
I got mine at MSC
> wrote:
>
>>20 thou is a lot. I'd seriously consider getting a new one. For
>>years I fought a 6" 3 jaw chuck that was about 6 thou out. I tried a
>>couple of the solutions that you no doubt will get from this post, but
>>they didn't work for me.
>> Finally, about 6 or 7 years ago I bought a brand new set-true chuck.
>>Even though it cost me $350 (3 times what I paid for the whole
>>(used)lathe 30 years ago, it was and is still worth it.
>> It has 0.0004" run out. I can simply throw stuff in there and cut
>>metal.
>> You may not need a 7 or 8 inch chuck. consider a 6" to hold the
>>cost down.
>>
>> You may be right about hurting the jaws with a drill or end mill.
>>I'd also suggest getting a collet or two for holding them. End mills in
>>particular seem to pull out of the 3 jaw chuck.
>>
>>
>>Pete Stanaitis
>>------------------------------------
>>Den wrote:
>>> I looking for some advice on how to improve my lathes 3 jaw chuck.
>>>
>>> Without going out to the workshop to measure it, it's about 7" or 8"
>>> diameter. The jaws are worn and when small diameter work is fitted it
>>> is a
>>> off centre by ~0.020". Looking at the jaws I can see where they are
>>> flogged
>>> out a little, particulary the outermost 10mm or so.
>>>
>>> I occaisionally stick a drill bit or endmill cutter in the chuck and
>>> clamp
>>> some work in a vertical mounted vice on the cross slide. I dont know if
>>> gripping the hardened tools has contributed to the jaw wear.
>>>
>>> What's the best way to clean them up. The chuck jaws allow
>>> external/outside
>>> edge clamping - can I wind the jaws out and fit a ring and then run a
>>> boring
>>> bar across the inside clamping surfaces of the jaws as someone here
>>> mentioned a week or so back?
>>>
>>> Cheers.
>>>
>>>
>
> Den
> I would recommend you making a trip over to HAFCO in Belmont and
> buying a new chuck. Fuerda chucks are not expensive. They also have a
> polish made chuck that is quite reasonable.
> Google for Hare and Forbes or HAFCO on australian only pages, they
> have a website with online cattledog.
>
> (I bought 2 new ones for a Myford I'm restoring. they're not
> expensive)
> Stealth Pilot
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>
> Without going out to the workshop to measure it, it's about 7" or 8"
> diameter. The jaws are worn and when small diameter work is fitted it is a
> off centre by ~0.020". Looking at the jaws I can see where they are flogged
> out a little, particulary the outermost 10mm or so.
>
> I occaisionally stick a drill bit or endmill cutter in the chuck and clamp
> some work in a vertical mounted vice on the cross slide. I dont know if
> gripping the hardened tools has contributed to the jaw wear.
>
> What's the best way to clean them up. The chuck jaws allow external/outside
> edge clamping - can I wind the jaws out and fit a ring and then run a boring
> bar across the inside clamping surfaces of the jaws as someone here
> mentioned a week or so back?
>
> Cheers.
>
>