Home made I.D expanding collet

You allso might like to look at video showing how to use a Rovi ID collet. Their brand came out years after I started to use my design. And you can buy their 5c collets up too 6 in dia . They also have them for other spindle designs and now I think they are making 5c lever collet set ups. And they are an American company in Caifornia near LA. Hardinge also makes ID collets but they are pricy.
 
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