I got a little 2”? Palmgren lathe milling adapter in a box of you name it shop tools that I got with my little used
10-22 lathe. Took a bit of time to figure out what it was. It just bolts to the back section of the cross slide. I’ve never used it because I also got a little griz. Mini mill thrown in with the lathe. At the time I thought that that tiny mill couldn’t do anything anywhere near what I would need. I was wrong about that. That stupid cheap little mill can do a heck of a lot more and better than I could have ever dreamed. Still planning on getting an up sized one though. I’ll probably sell of the little milling adapter unless I find another use for it.
As you can see, the adapter is a simple tube. It has a base that is slightly shorter than the height of the Palmgren base, a flair area to straddle the base legs and a reduced diameter tube to reach high enough to use the QCTP nut. The legs on the Palmgren is machined a flat surface for the adapter to sit on properly. Depending on the height of the top slide, some kind of spacer under the vice might be needed to raise the center point of the vice to the center line of the lathe, if so desired. On my lathe I have not the need to do so.
Yes for the adapter for the Atlas lathe, I did use a mill for the relief areas. I also used a surface grinder to flatten the upper and lower surfaces. The newer tube version is much easier to make and use!