Hi Guys,
I hope you can help me out or point me in the right direction. We have a Takang TNC-25-S lathe with an old Fanuc 0T. The tool turret is a Duplomatic BSV-N (electronic, not hydraulic) with absolute encoder. Our problem is as follows :
* When doing a tool change (JOG mode), the turret indexes to a tool position, 2 positions from the selected position, if we select T0101 then the turret moves to T0303, for any combination - always 2 positions out of sync.
* I've tested all electrical connections to the tool turret and it's encoder as per Duplomatic's data sheet, all are correct. The proximity sensors, solenoid indexer and motor brake all function correctly.
* I have located the machine builders diagnostic setting numbers that reflect the encoder's position "D0460" (corresponding to the correct position values as stated in Duplomatic's data sheet for the tool turret), the selected tool number "D0461" (I can see the value change as I select different tool positions on the operators panel)
* Once I select a tool position on the operators panel and press tool start, the turret indexes, on the diagnostic screen, the encoders value (diagnostic # D0460) is that of 2 tool positions onward and not the selected tool position.
* I've tried to reset the turret by turning it to the correct tool position by hand, when disengaging the turret motor's brake and indexing solenoid. I watch the diagnostic setting D0460 as it changes to the correct tool position value corresponding to the selected tool position as on the operators panel. I reboot the control, zero the Z and X axis and try to manually change the tool position in JOG mode - but the problem remains, the tool turret indexes and goes to a tool position 2 places from the selected tool position.
* I've also tried to change the value of the tool selected diagnostic to match that of the encoders, without any success.
Is there a counter parameter or diagnostic setting which I can search for and change to force the tool turret to only increment/decrement the necessary amount of times to fix this indexing issue ? I've tried to contact the machine tool builder but unfortunately the machine is too old for their records/personal to be able to assist.
I can upload photos/parameters/diagnostic settings if any of it will help. I can access the ladder as well on the machine and take some photos ?
I will appreciate any advise - everything else on the machine seems to be working perfectly, this is the last unfortunate problem that's got me stuck. It would be a shame to let the machine go just because of this.
Thank you.