I was doing some turning over the weekend trying out a new faceplate. The faceplate went on quite easily - no cross threading. While turning I had a catch that managed to stop the spinning (just got a Powermatic 3520A a couple of weeks ago - gloat). I assume the belts slipped when the piece stopped turning.
Anyway, it was VERY difficult to remove the faceplate - not the initial move that is solved with the nylon washer but rather it was a fight the entire length of the threads. I then tried putting my oneway and Nova chuck on and they were difficult to get on but did eventually seat. Those 2 chucks now go on/off like normal. However, NONE of my faceplates (nor my wood river chuck) are going on far enough to seat. They seem so just stop threading on with about 2 or 3 threads left.
Is it possible I damaged the threads (would expect the spindle to be harder than the faceplate though)? Was the catch and this difficulty just coincidence? This was the first time I had used a faceplate on this new lathe.
Any theories why the 2 chucks are now working well but not the faceplates/wood river chuck?
Any ideas what I could have done, how to check and possible fixes?
Thanks,
David