I stand corrected. Yes step collets are available up to 6" size. Also collets for clamping the ID of parts up to at least two inch.
SPENDY stuff though.
If your shaft needs to go all the way through the collet your out of luck. If speed is not an issue, "holescreek"s suggestion 3 jaw chuck, seems like reasonable price and good suggestion. Other that that an emergency collet machined to size, carefully, would probably be most accurate, and depending on your releasing mechanism, the fastest.
hardinge makes a step chuck for 1.25 but it doesn't have much depth the biggest 5c collet I have seen is 1 1/8" that has a through hole hope this helped.
Thanks guys... I think I will go with the emergence collet and turn it in my lathe.. I think it will have less run out than a 3 jaw... I saw a emergence collet on the net but didn't know that it could be custom fit in a lathe... This I can do...
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