ER16 Collet Chuck for Unimat M12X1 Spindle

Paul,
Thank you for the excellent documentation on your ER16 collet chuck build for your Unimat. A T.I.R. of .0004” is great on a removable “screw-on” chuck.
Great work!

Hi Paul:

I did an ER32 chuck for my Unimat:

Attachment 45112

Carl.

Hello Paul:

I have a full set of ER-32 collets and decided I wanted a chuck for my Unimat too.
So I bought a Cat40>ER-32 chuck and cut the Cat40 end off:
Attachment 47104
Then I bored the back of the ER32 section for a new bushing and welded it in:
Attachment 47105Attachment 47106
I clamped the ER32 collet on a trued shaft in the lathe and tapped it M12x1 for the Unimat:
Attachment 47107
Then with some checking and stoning I had it running true:
Attachment 47108Attachment 47109
Now it is all finished and it is great. I used it to hold wood dowels and the range -1mm really helped.
Attachment 47110
Some said the chuck would be too large for the Unimat, but it isn't much larger than the 4 jaw chuck.
Good luck! Carl.

<!-- BEGIN /var/www/html/homemadetools/protected/modules/zeus/views/tool/postUpdate.php -->
Thanks carl blum! We've added your Unimat Collet Chuck to our Workholding category,
as well as to your builder page: carl blum's Homemade Tools. Your receipt:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/homemade-unimat-collet-chuck"> <img src="/uploads/262206/homemade-unimat-collet-chuck.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="https://www.homemadetools.net/homemade-unimat-collet-chuck">Unimat Collet Chuck</a> <span> by <a href="https://www.homemadetools.net/builder/carl+blum">carl blum</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/chuck'>chuck</a>, <a href='https://www.homemadetools.net/tag/collet'>collet</a> </div> </div> </div> </div>
<!-- END /var/www/html/homemadetools/protected/modules/zeus/views/tool/postUpdate.php -->