[modeleng] Re: Identifying collet chucks

  • From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
  • To: <modeleng@xxxxxxxxxxxxx>
  • Date: Sat, 3 Sep 2005 00:36:43 +0100

Hi Tony

Don't use a Jacobs chuck for anything other than drilling.  It will come 
loose if you try to use it for turning or milling.  Tapers need an axial 
load to keep them in engagement, which brings us back to drawbars!

Ron

----- Original Message ----- 
From: "Tony Wells" <oaksfield@xxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, September 02, 2005 9:12 PM
Subject: [modeleng] Re: Identifying collet chucks


> That is true Ron, I must admit, but the hole through the Myford is so 
> small
> that I should imagine any bar stock going through it would sag under it's
> own weight and foul the bottom of the left hand exit hole. I was thinking 
> in
> terms of just holding short lengths of rod though, rather than bar stock.
> Under such circumstances, perhaps a Jacobs chuck with an MT fitting would 
> do
> just as well. I read somewhere that the run out of them is only a few 
> tenths
> of a thou!
>
> Tony.
>
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