Originally Posted by
SINUMERIKO
Hello,
I’ve been trying to fix this hydraulic turret for about a week or so after an operator had it crashed. It unclamps ok in all 12 stations, turns both sides as commanded but almost half of the times it skips the exact point of clamping back and after 2 or 3 seconds being stopped halfway between stations the alarm pops up. Looks to me like it is not reducing the turning speed at the appropriate moment and it skips the right position due to inertia. I’ve disassembled the whole turret, even the index motor has been taken apart without finding the cause or anything wrong. The solenoid valves and their coils are ok; I’ve changed the fwd, rev, unclamp and speed reduction relays already. I tested the encoder at bench and at PCM DGN status, I have also checked the clamp sensor. The turret can sometimes complete the 1 to 12 changes, one by one, but only in forward direction, if I go from say 10 to 9 it immediately fails. I’ve not found excessive wear at the main shaft or anywhere else, the lock pins at the main tool holder front plate were replaced after the crash. Everything is chip free and lubricated; the main hydraulic pressure is set at 600 psi as the manual says, the solenoid valve coils are 40 ohms.
What else should I check? ...Any and all the help is greatly appreciated.
Thanks.