[modeleng] Re: Hooray.... sliding head collet chuck fixed!

Congratulations on your success!

Al


--- On Mon, 2/9/09, Chris Crosskey <chris.crosskey@xxxxxxxxx> wrote:

> From: Chris Crosskey <chris.crosskey@xxxxxxxxx>
> Subject: [modeleng] Hooray.... sliding head collet chuck fixed!
> To: modeleng@xxxxxxxxxxxxx
> Date: Monday, February 9, 2009, 4:01 AM
> Howdy all... although weather (and rugby viewing) curtailed
> workshop
> activity this past weekend I managed at least to get one
> thing filed in
> the "good job jobbed" file.... Many moons ago I
> siold off my MA99E
> sliding head collet chucks and the hundreds of collets I
> had accumulated
> for them, they took up too much space, I could never find
> the right damn
> sized collet and I'd pretty much stopped doing the
> repeat operation
> stuff for work that had been their raison d'etre....
> The other reason I
> let them go was because they were worth rather a lot of
> money and I
> managed to pick up for cheap a Crawford B-series lever
> operated chuck
> and enough collets to have pretty much the full set (I
> think I'm missing
> two out of the complete set) ... only problem was the chuck
> needed a
> rebuild.... Well I finally sorted it out.... Basically some
> previous
> attempt at servicing it had left it with two issues:
>  
> 
> The return spring preload grubscrews had been screwed down
> onto the
> springs instead of preloading the springs and locking them
> in position,
> so the springs weren't doing anything;
> 
> The collet holder and chuck body were mismatched so the
> collet holder
> was a fraction too big, also the chuck body was out of
> round by nearly a
> though.....
> 
>  
> 
> I replaced the springs from my stock with some that
> approximated the
> right force and very carefully skimmed the chuck body and
> repolished
> both the body and the collet holder....
> 
>  
> 
> End result is it all seems to be fine, the collets open and
> close
> smoothly, the grip seems good and the best thing about it
> is 28 collets
> cover the entire range ......
> 
>  
> 
> chrisc
> 
> 
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