Thanks for the suggestion Norman, but the split collar won't work in this situation. This is 'widget production '.
The copper bar is in 1 meter lengths, is griped in the soft jaws, part turned in main spindle, opposing spindle advances grips the part which is still attached to the bar. Main spindle releases it's grip and bar and part are pulled out 45 mm. Main spindle grips again, both spindles spin up to speed in synchronism, the part is parted off. Opposing spindle withdraws and second operation is performed on its left hand end (drill and tap).. The parts catcher comes out, opposing spindle stops, parts ejector pushes part out as flushing coolant washes the collet for next time. The the whole cycle repeats until the bar is all used. Nb main spindle has a sleeve reducing it to 10.2 mm to prevent bar whip.