C/Bores from old end mills

As I spent much of my time in the grinding shop I used to make piloted counter bore cutters from old end mills for our jig borer, ok I had access to a universal grinder at the time but I have since made them by off hand grinding and finishing with a toolpost grinder and a home made Dremel type tool for backing them off. There is no great precision required in making this type of cutter after all you are only getting a cap head out of the way. Being HSS they last well and can be touched up with a diamond file. Also easy to make from drill rod in a two lip style.
Here is a pic of the ones I am using at the moment, I have a large box of old end mills etc so I make them up as needed.

Attachment 25404

A good idea for recycling, and very useful if you like to use hidden heads!
I'm a Ifanger counterbore mills fan and they are very expensive if you want them new, a good alternative.

In the machine shop at work, we had one fellow who would turn down the end of a partially softened drill bit to make a specialized counterbore with carbide or ceramic tooling, similar to this approach. Nice post!

I've made a lot of counter bores out of drill bits on my lathes with tool post grinders then touched up the cut angle manually on a bench grinder

<!-- BEGIN /var/www/html/homemadetools/protected/modules/zeus/views/tool/postUpdate.php -->
Thanks olderdan! We've added your Counterbore Cutters 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-counterbore-cutters-2"> <img src="/uploads/217657/homemade-counterbore-cutters-2.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-counterbore-cutters-2">Counterbore Cutters</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/counterbore-cutter'>counterbore cutter</a> </div> </div> </div> </div>
<!-- END /var/www/html/homemadetools/protected/modules/zeus/views/tool/postUpdate.php -->