Originally posted by J Tiers
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1/4" shank size is .2535 closest letter E or F drill
5/16' is .316 closest being letter O drill
3/8" is ..380 closest being letter V drill 3/8" drill being .375
Sure, the sleeve will expand a little but for that perfect fit it will have to be bored unless I order special size reamers. This is where the ERs come in handy.
The shank sizes may differ from one mfg. to the other. These measurements are taken from the ones that I need to point. The bushings would have to be thin walled as 5C collets don't have the squeeze power that a chuck has, but that's not an issue since I'll be lightly grinding the bevels.
JL.................
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