Hi folks

I have a Hitachi Seiki TS 15 with the Seicos control. Our turret timing belt snapped and I have since replaced it. However, now when I do a turret index, the turret begins moving in one direction, then inexplicably changes and stops half way between tools. I have tried a complete turret restoration but that has not worked at all. Obviously as soon as the turret clamp tries to come back, it pulls against the convex part of the turret index drive coupling and then the location shaft doesn't depress the microswitch and I get a Turret Index Time Over alarm.

We have removed the turret, and tried the indexing sequence without it. I have tried a number of different reset techniques (spindle stop + select + feed hold) while powering down and then up again. Also, no luck.

Please, any ideas?