Hi my pincer gripper is allowing my sheet to bounce in perfect does anyone know how to adjust the pincer grippers, it looks like there is a set bolt and an allen adjust will tightening the grippers stop the bouncing or is it caused by something else in the pincer gripper.
Thanks Joe

Have you back trimmed the stock?

What appears as bounce is actually the result of the difference in length from front to back of the sheet


I would never suggest in messing around with the pincer gripper settings, that is best left to an engineer

The pincer grippers are on the shaft if the shaft becomes worn it will have play in it. It cost about a galzillion dollars to have the pincer grippers repaired. Like the man said back trim the stock, makeready the back side, make sure it is straight, then move the plates on the front to line up with the back. If it bounces then you might have a pincer bar problem i hope not

What year Speedmaster? Does it only bounce At high speed in perfect only?

If your problem only appears with perfecting than check the suction bar.
Alle the holes should be clean, if not take a 3,5mm drill in between two fingers, turn it in and than pull it out of each hole along with the dirt. Also check the filters in the vac.pump.
Check if the streching-function of each bar is on and works properly, you can do that by pushing the control-bar with the little cam-roller on it sideways in the DS-direction.

In my experience there is always a little bounce while perfecting so if it's a critical job don't perfect.

Check the cam follower on the segment for pitting or wear marks, if anything looks odd there have it replaced. It should be done by a tech due to the torsion bar under the segment. Tension on the pincer fingers should be set from underneath the press, this should also be done by a tech. Alittle variance in sheet size generally won't affect front to back reg when perfecting. If your sheet is too long it will nick, if it is too short it may drop it.