Hello all--
I have a PM3520B and recently took the tailstock assembly apart for cleaning. On that tailstock, there is a groove milled into the quill, and a threaded grub screw that rides in the groove to keep the quill from spinning. I noticed while I had it apart that there was substantial galling on the wall of that groove. I believe this is from drilling, where you're advancing the quill with a rotational load, pushing the side of the groove into the threads of the grub screw. PM has obviously recognized this problem because on the 3520C, the grub screw threads into a small steel plate that rides in the groove, which puts smooth metal on smooth metal and also increases the surface area of contact greatly. See part #28 in the diagram below of the 3520C.
Capture 169.JPG
Anyone have a patch or workaround to deal with this? I thought about using a brass grub screw, but the threads that extend into the groove would get smashed and I'm worried I wouldn't be able to get it back out.
Best,
Dave