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Posted by Adrian G on September 25, 2008, 4:07 am
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> On Wed, 24 Sep 2008 12:19:14 -0700 (PDT), Adrian G
>
> >Hi all
>
> >I have been given a collet chuck for my lathe which has a different
> >type of collect to most I have found. The collets are similar to a 5c
> >collets except they have a thread of 12TPI at the base, are 1.25in dia
> >over the thread. They are 3.43 in long and have a fromt diameter of
> >1.5in.
>
> >Could someone help with an identification of the type and, if anyone
> >has any they want to sell, could you let me know. I am after 1/16 to 1
> >1/2 collets as time and pocket permit!!
>
> >Many thanks
>
> They are Crawford "Trugrip" collets. Quite rare and there are more
> chucks than collets out there. Don't even ask the new price unless
> you're backed by a sovreign wealth fund.
>
> If you take the chuck apart you can see how it's made. There's a
> stepped ring inside that can be easily remade to accept 5C threads and
> then you can use proper 5c collets. The only downside is the fine
> thread of 5C requires more turns of the chuck key and turning the
> handle the wrong way, 5C are RH threaded and Trugrip are LH.
>
> Charles
Many thanks for that Charles. looks like another job for the weekend!!
Adrian
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>
>I have been given a collet chuck for my lathe which has a different
>type of collect to most I have found. The collets are similar to a 5c
>collets except they have a thread of 12TPI at the base, are 1.25in dia
>over the thread. They are 3.43 in long and have a fromt diameter of
>1.5in.
>
>Could someone help with an identification of the type and, if anyone
>has any they want to sell, could you let me know. I am after 1/16 to 1
>1/2 collets as time and pocket permit!!
>
>Many thanks