OKK MCH600 8 pallet 50 taper HMC with Mitsubishi Meldas 300
I've been working on this machine for the past 8 years, machining mostly investment castings requiring true position of prcision bores on center, TP of .001 inch. For the past 4 years, I have susspected an error in my x axis but could not prove it. This past month it has finally reared it's ugly head. I put a .0005" indicator in the spindle and wrote a program with 3 offsets going to 3 indexes, b0, b90, b270. From home position in x,y,z, the indicator will rapid in position, 1." away in x, then feed to x0. I have found my b axis to be accurate in rotations. However the error observed in x to be as great as .002". A machine tech has been called out, who also observed this problem. Tightening of the gibs and purging the way lube lines was thought to be the fix, however the error is still observed. This machine is box way construction with glass scales. I was told that the control would alarm if there were a problem with the scale. Maybe someone on this forum has had a similar issue. I appreciate all replys and any advise , thanks.