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Burnerd Multisize Collet Chuck . .

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WALLACE30/11/2009 11:18:40
304 forum posts
17 photos
Hello all.
I've got a Burnerd Multisize collet chuck which has either been dropped from a very great height or wasn't ground correctly in the frist place as the run out on the end of the collet taper is a couple of thou.
So the question is - how or where can I get is reground  ? (and not for totally silly money . . ).
I should add that the spindle end is a L00 taper.
KWIL30/11/2009 22:04:03
3422 forum posts
66 photos
Sorry to see about your problem, the Multisize is a superb bit of kit as I have found.
Have you tried contacting Pratt Burnerd? try 
He is the contact point for spares and may well direct you.
WALLACE15/12/2009 14:00:02
304 forum posts
17 photos
Thanks for the reply !
I was going to email - but thought I'd have a bit more of a play around first. . . 
I turned a scrap piece of  1 1/4" bar paralell and put the chuck onto this ' back to front' if that makes sense - and measured the run out of the LOO taper end. And it was about 1/3 of a thou - so now I'm starting to think the spindle on the lathe isn't true.
Yet that appears to be the same - or possibly less. (Slightly diificult to measure around the full 360 degrees due to the locating key ).
Finally, I started to wonder about the accuracy of the taper on the chuck - when 'blued' up, it only appears to make contact with the broadest part of the taper - there's virtually none on the front part.
All interesting (frustrating ? !) stuff !
Out of curiosity - and something to aim for - does anyone know what should be the run out of say a 1" precision ground bar held in the chuck ?   

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