Chuck size (good idea or not.?)

I would imagine it is. But I imagine said system with it being Bernerd is a 'lovely' handsome price also.! I would probably have to sell my playtime motorbike to fund one. lol

Yes John, I think the smallest size possible for a D1-3 backplate is 100mm or the mounting spigots would end up in 'mid-air'. I don't have a problem with 10mm around the back of the chuck protruding so long as it's finished smooth and rounded edges to prevent my knuckles becoming 'customised'

Cheers all, Nick

I would imagine it is. But I imagine said system with it being Bernerd is a 'lovely' handsome price also.!

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Regrettably true, at list prices ... but they do come up seconhand, and they were built to last.

MichaelG.

> they were built to last.

I have often wondered about the durability of the rubber inserts. How do they stand up over the years?

Neil

???

What rubber inserts, Neil?

Burnerd MultiSize is not to be confused with RubberFlex.

MichaelG.

Ah! I'm sure I have seen the Jacob's rubber ones illustrating comments about the Bernerd type.

Neil

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Good and interesting replies. Thanks.

The side discussion about the collets is a worthy one and I can understand the benifits of such a system and why it should be considered when purchasing a new chuck.

I should however have made my requirements a little clearer in my OP (which also ties in with a recent thread I made about avoiding marks on work) I will also need to re-hold part finished items that would not be possible in a collet chuck such as things in the image below.

A collet chuck at some point will be on my 'new toy' list though.

Cheers, Nick

Thanks for the picture, Nick

Both aspects of your requirement are now much clearer.

I would be tempted to make a sleeve, split lengthwise [i.e. two pieces] and nicely finished:

Outside diameter bigger than the lumps on the job, and maybe with a flange.

... This would then clamp very nicely in a big collet.

MichaelG.

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Michael, from henceforth you shall be know as 'The collet fetish man-guy-bloke-fella' .!!!!

Nick

There is one other thing with collets that has not been mentioned (I think), they tend not to mark the work piece, never mind the repeat accuracy that you'll never get with a 3 jaw self centring chuck unless you use soft jaws. You can reduce the amount of TIR on a three jaw chuck by using shims, this can be calculated or a little trial and error.

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Nick,

I can live with that

Make me a badge, and I shall wear it with pride

MichaelG.