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From: Snag <Snag_one@msn.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Further testing needed ...
Date: Sat, 21 Sep 2024 17:55:39 -0500
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On 9/21/2024 4:21 PM, Jim Wilkins wrote:
> "Snag"  wrote in message news:vcn5gc$1n35p$1@dont-email.me...
> 
>    Further testing having been completed the chuck has runout with all 3
> sets of jaws of around .007" . Chuck body is more like .002-.003 . A
> known straight 1/2" rod is not pointing  straight with the ways ...
> looks like it's time to set up the toolpost grinder .
>    So it looks like maybe a cheap chuck , though well made . Fit and
> finish are good , everything fits as it should and the scroll moves
> smoothly with all 3 pinions . Which brings me to a question - since
> there's more than one pinion is it going to make any difference which
> one I use ? Do I need to give 'em all 3 a twist when I mount a piece of
> stock ?

------------------

In the new Mongolian 6-jaw I cleaned up the scroll plate fit quite 
closely on its pivot in the body, too tight until it was cleaned. I 
don't think it could shift away from whichever pinion I tightened. 
Perhaps it might in a worn chuck.
------------------

   I don't think this chuck has much wear . All the jaws look "new" but 
that doesn't always mean much . I was told the original owner was into 
woodworking , which doesn't necessarily require the precision needed for 
metal working . By tightening all 3 pinions I have gotten it down to 
average .004" , which is pretty close to my original equipment 5" chuck 
.. I can live with that ...
-- 
Snag
Voting for Kamabla after Biden
is like changing your shirt because
you shit your pants .