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.

Attachment 16312

Attachment 16311

Sure would like to see the taper gauge.

Quote:

---

Originally Posted by C-Bag

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.

Attachment 16323Attachment 16324Attachment 16325

<!-- BEGIN /var/www/html/homemadetools/protected/modules/zeus/views/tool/postUpdate.php -->
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:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="http://www.homemadetools.net/homemade-collet-holder-5"> <img src="/uploads/164965/homemade-collet-holder-5.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="http://www.homemadetools.net/homemade-collet-holder-5">Collet Holder</a> <span> by <a href="http://www.homemadetools.net/builder/olderdan">olderdan</a></span> </div> <div class="tags">tags: <a href='http://www.homemadetools.net/tag/holder'>holder</a>, <a href='http://www.homemadetools.net/tag/collet'>collet</a> </div> </div> </div> </div>
<!-- END /var/www/html/homemadetools/protected/modules/zeus/views/tool/postUpdate.php -->

Olderdan
Nice job and another fine tool
Nelson

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