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I needed to hold some 1/2" pistons in my milling machine vise today so I could mill out the inside. My usual method is to use a couple of v-blocks but these pistons were really too small.
I had an ER-20 collet chuck that had had the shank mostly cut off, so I took a piece of 1.5" square aluminum and bored it out to a very close sliding fit on the remaining part of the shank. I installed set screws on 2 opposite sides that screw into the flats on the shank normally used for a wrench when tightening the collet. The collet chuck can be removed and used for other things if need be.
Chuck
I had an ER-20 collet chuck that had had the shank mostly cut off, so I took a piece of 1.5" square aluminum and bored it out to a very close sliding fit on the remaining part of the shank. I installed set screws on 2 opposite sides that screw into the flats on the shank normally used for a wrench when tightening the collet. The collet chuck can be removed and used for other things if need be.
Chuck