I have a Tongtai Topper lathe with fanuc OITC control. We had a hit the other day where our new operator hit a boring bar on the chuck in the process of a tool change. After resetting and taking back off, we noticed the turret was setting down hard on a counter clockwise tool change. Before I get ahead of myself, this is a slant turn machine with V.D.I. tooling. I pulled all of the holders out of the turret and started with loosening the face bolts to allow for some manual manipulation of the disc. I can get the "thump" from clamping lessened, but can't get rid of it completely. My next step was going to be to loosen the coupler on the servo and call up a tool, then call up t0101 for the original zero point. My thinking was that with the turret in the clamped position and the coupler being disengaged, this would allow for the servo to go to "home or start position", without having a load on it. Once this was done, I would tighten the coupler back down and everything would be timed correctly again. Unfortunately, this is a direct drive servo with a taper lock on the drive pulley. A little more of a tear down than what I was initially planning on. Next, I went into the PMM and reset zero point for the encoder while in the clamped position. I was sure that this would fix my problem because each tool change position would be exactly the same distance, 30 degrees for 12 stations, from one another and being as I zeroed a new clamped position, each movement would be in the correct position for a smooth seat. I still have the hard seat! One thing that confuses me is that with the face bolts loosened on the turret, I have smooth seating a no "thump". Once I tighten the face bolts, there's the thump again. I'm thinking this has something to do with the turret putting load on the pressure plate and loading up the mechanics of everything, but not sure. Also, the directions I have for resetting the turret servo zero point says to have hydraulics on but CNC off. This confuses me because how can I have the CNC off but still have hydraulics? Any help would be greatly appreciated in working through this problem.
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