Sorry in advance for the length of this thread, but I am going crazy over this problem I am having. I have lined up a many turrets in my time, and have never had this much trouble with one. I posted a thread on here the other day about an issue that I was having with a hard seat on turret clamp. This is a Tongtai Seiki TA-25L CNC lathe with a V.D.I. tooling mount and Fanuc OITC control. With the machine manual and this trusty site, I began my breakdown of the problem. I started off just loosening the face plate bolts and trying to indicate everything in. Everything will indicate in within .0015 thou but still the hard seat. Went into the PMM and reset zero for the turret servo. I know this was successful because I can change zero point from tool station #1 to station #10, and back. I thought by doing this, with a good clamp, the servo would drive from station to station at the correct increments. 12 station turret, 30 degree movements. The hard seat is still there. As you can imagine, frustration started setting in at this point. I pulled the battery back-up from the servo, pulled the power cable, and let the battery alarm come. I then powered the machine down, hooked up the power cable, plugged the battery back in, and powered back on. PMM had all of the alarms and 11 bit 0 was 10000000. I then went in and unclamped the turret, via Fanuc's re-zero procedure, manually rotated the turret back to tool #1 station, re-clamped, and then reset 11 to 10000001. Powered back down. Powered back up, everything was zeroed and good to go. Still the hard seat and thump. Next, I pulled the whole turret assembly down and started from scratch. Hardened pull pin dowels on curvic coupler, turret cast side, were not bent. Ran a reamer back through the hole and put in new dowels. I worked my way back out of the assembly, checking everything as I went, and cannot find a single thing that is out of whack. As I sat there today, it dawned on me. I'm sure that Fanuc uses this servo on all types of turrets. There are many different types of turrets, so there must be a parameter or setting that allows the builder to tell the control how many tool stations there are. My question to all of you guys is, why couldn't I change the setting for tool station rotation? This way I can unclamp the turret, do a tool change with the small amount that I am off on alignment, and reclamp the turret. I would then go back to PMM, change 11 to 10000000, and power down. On reboot, change setting back to 10000001, and power back down. Power back up, change parameter for this unknown encoder/servo rotation setting back to 30 degrees for 12 stations, and check for proper seat. I would continue this until I got a soft seat. First, is this possible, and second, does anyone know what this setting for rotation angle is and where do I find it? I am sure that I am missing something with this whole thing, but can't figure this thing out for the life of me. I would appreciate any and all help and suggestions on this. Thanks guys!:drowning: