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Update, well it seems the early GHA tool and cutter grinder does not accept 20mm U2 collets they are 16mm dia. So it is looking like I may have to make them, or at least adapt an ER collet holder as I need a half inch (12.7mm) collet) and currently only have 1/8" and 1/4".
er16 only goes up to 9mm, so need an er20 with a 16mm straight shaft. I will have to see what I can find, heads are available, though I may just make a single 1/2" collet and be done with it.

[QUOTE="Wildman, post: 1724650, member: 13686"] Update, well it seems the early GHA tool and cutter grinder does not accept 20mm U2 collets they are 16mm dia. So it is looking like I may have to make them, or at least adapt an ER collet holder as I need a half inch (12.7mm) collet) and currently only have 1/8" and 1/4". er16 only goes up to 9mm, so need an er20 with a 16mm straight shaft. I will have to see what I can find, heads are available, though I may just make a single 1/2" collet and be done with it. [/QUOTE]

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