Thought you guys might enjoy seeing the little X2 doing precision grinding. I tried this with the original X2 table and no dice unless I locked the Y axis. Works great with the new table!
I figured out a way to run the 4th axis as the spindle and still have the X2 spindle running at the same time.
http://www.youtube.com/watch?v=tu20ndoPuS0This is end prep for the permanent precision ground ballscrews for my new table. The new table had Thompson ballscrews temporarily since the post office lost the ground screws. I finally got them and they are on the table now. Zero lash and smooth as silk!
Surprisingly, I can actually hold less than .001" on the OD of the shaft I am grinding in the video. I have a Thompson on the Z axis also, but I put oversize balls in it to take out most of the lash and I have a gas spring (strut) on the Z pushing the head upward pretty hard, so as long as I sneak downward slowly, I can get fairly accurate results.
Notice the 4th axis is complete now with belt guards, the home sensor has been relocated under the belt guard and there are pin blocks to lock the spindle for collet changes.