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Thread: ER 20 collet holder from drill shank

  1. #1
    olderdan's Avatar
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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.

    ER 20 collet holder from drill shank-imgp0304.jpg

    ER 20 collet holder from drill shank-imgp0303.jpg

  2. The Following 6 Users Say Thank You to olderdan For This Useful Post:

    aphilipmarcou (02-15-2017), bigtrev8xl (01-31-2017), C-Bag (01-29-2017), Paul Jones (01-28-2017), PJs (01-30-2017), tonyfoale (01-28-2017)

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    Sure would like to see the taper gauge.

  4. #3
    olderdan's Avatar
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    Quote Originally Posted by C-Bag View Post
    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.

    ER 20 collet holder from drill shank-screen-shot-01-29-17-06.34-pm.pngER 20 collet holder from drill shank-screen-shot-01-29-17-06.04-pm.pngER 20 collet holder from drill shank-screen-shot-01-29-17-06.29-pm.png
    Last edited by olderdan; 01-29-2017 at 12:48 PM. Reason: extra comment

  5. The Following 2 Users Say Thank You to olderdan For This Useful Post:

    Paul Jones (01-31-2017), PJs (01-30-2017)

  6. #4
    Content Editor DIYer's Avatar
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    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:




  7. #5
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    Olderdan
    Nice job and another fine tool
    Nelson


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