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Hold square bar in a 3 jaw chuck
Rob.Wilson:
Handy Tip Dave :thumbup:
Rob
Anzaniste:
Is it possible to hold square bar in an ER32 collet?
AdeV:
--- Quote from: Anzaniste on January 06, 2012, 06:17:48 PM ---Is it possible to hold square bar in an ER32 collet?
--- End quote ---
ER collets appear to only be available in round form. Whilst you probably can hold square stock in a regular collet, I wouldn't because I suspect it would damage the collet.
5C collets can be had with round, square or hexagonal grips, but I guess that's no good if you've already got ER32 stuff....
Anzaniste:
That was my point really. Isn't a round collet essentially the same as the split collet that started this thread. I was just wondering if anybody had tried it. Idle curiosity really. :scratch:
andyf:
--- Quote from: Anzaniste on January 06, 2012, 06:17:48 PM ---Is it possible to hold square bar in an ER32 collet?
--- End quote ---
As a last resort, it is possible with care, if the collet has 4 or 8 slits as you look at either end . You have to be careful that the corners of your square bar are gripped by the lobes, and aren't trapped in the slits, so don't put the corners in the middle of the lobes you can see at the front, because that will place them in the slits which run from the back. If the bar shifts, a corner is bound to catch up in a slit and try to twist the collet out of shape. So, light cuts only, which isn't easy because of the interrupted cut which you will get on square bar.
On reading this before I post it, I wonder if having the corners caught up in the back slits could be be an advantage, if the diagonal of the bar is not much less than the uncompressed ID of the collet.
I've only ever done it once, because it was proving difficult to get a smallish square bar well centred in a 4-jaw chuck.
Andy
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