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oldcarguy:
There's a lot of Kearney Trecker Rotary Head Mills around. And the Machinists that own them are mostly old timers and treasure them. The Cherrying attachment is rather rare though. Nice that you remember that he owned the attachment. Here's a picture of mine. I have yet to recover it from the fire. Priorities have hindered recovering it.
The Cheerying attachment mounts on the underside of the rotating head.



The link will shows my mill in action. Just taking a light cut showing how it runs.

https://youtube.com/shorts/07f--GiHelY?si=Yf-8RVs_08X3uRjA

The Cherrying attachment moves the spindle depth cut in a relationship of the cross slide movement on the head while rotating the head. The end results is cutting a spherical ball shape into the work piece. It can also make a male spherical shape.  If you run the X axis rather then the rotating the head. You'll get a round longitudinal channel. As if you ran a ball mill in a piece of steel. In plastic injection molds that produce PVC elbows. Both the core can be produced along with the cavity. Picture the elbow, the inside is made from a core, that is pivoted out of the molded part before it is ejected from the mold. 

Anything this attachment will do, Today's CNC can do faster and better.. Hence the Cherrying head is obsolete.

Here's a link to my shaper G&E running. Making a light cut in a piece of 4140 heat treated to 48 RC

https://youtu.be/-IbU4g8cX4A

Link Cherrying on a K&T Mill
https://youtu.be/ypMl2kQTeMo

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