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Thread: ER 20 collet holder from drill shank

Jan 28, 2017, 12:40 PM #1

olderdan

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ER 20 collet holder from drill shank

I had a No 3 MT drill that was beyond redemption and the shanks are machinable (same size as my lathe mandrel) so I decided to make an ER 20 collet holder from it.
Easy job really using a standard closing nut and drilling through clearance for 13mm.
This is the most accurate form of mounting and quick to use and is proving very useful.
The 8 degree taper is the only critical part so I made a taper gauge for that which I will use again as I am in the process of making a 3 speed geared milling spindle on the lines of the Quickstep mill.

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