ER 20 collet holder from drill shank

[olderdan]

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.

[C-Bag]

Sure would like to see the taper gauge.

[olderdan]

Sure would like to see the taper gauge.

Hi C-Bag
Nothing special about the gauge, its main purpose is to set the top slide accurately before boring to an exact 8 degrees, also used for setting the depth.
It is important for ER type collets that the angle is correct as they compress at their full length.
Screen shot of a drawing (not mine) will explain it better, the drill shank holder was a prelude to making a thee speed spindle for milling on the style of the one pictured.
Tool MUST be on c/Line.

[DIYer]

Thanks olderdan! We've added your Collet Holder to our Machining category,
as well as to your builder page: olderdan's Homemade Tools. Your receipt:

Collet Holder by olderdan

tags: holder, collet

[ncollar]

Olderdan
Nice job and another fine tool
Nelson

[dbat74]

DITTO............