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09-08-2011 #6
Last Activity: 05-04-2020
Agreed...
Originally Posted by i2i
You mentioned self centering 4 jaw. The advantage of it is 4 jaws clamp the stock more firmly than 3. For a given clamping force you will mark the part less with the jaws as less pressure per jaw. Not being able to hold hexagons is annoying as holding nuts in the chuck is a good quick way to hold a bolt without marking the thread ... but you're not going to want to do that in a mill.
I have a 4 jaw independent 100mm and 3 jaw (125mm) for the rotary table.
Being able to centre a part in the 4 jaw chuck is not much of an advantage as you can tap the chuck into place on the rotary table.
A chuck with bolt holes in the front makes it a lot easier to mount.
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