TB0257 Fault Finding Gripper Slip

Checklist of root causes for gripper slip issues

Gripper, Slip

Technical Bulletin

TB Number:	257
Originator:	Gareth Green
Machine:	All
Date:	11/07/14
Circulate to:	Service
Title:	Gripper Slip

Symptoms

Code	Description
	Accuracy Issues Gripper moving no profile
	Gripper Slip Error Message
	Slots wrong length
	Operation in wrong place
	Bar missing from queue
	Incorrect bar length measurement
	Bar does not eject properly
	Piece length wrong

                                                          

Actions / Checks

Code	Description	Tick
	Is it on all profiles
	Is gripper bent or worn Is gripper loose
	Clean teeth? Recently Replaced
	Prior to problem? Collision
	Check rollers free to turn and clean
	Blunt tools / correct tools
	Clamp pressures
	Gripper positions correct for profile
	Zip gate and clacker heights ok
	Bits of machine caught in V notch (esp rear)
	Clutch / clutch relay stuck on
	Faulty gripper sensor
	Loose gripper heel / insert
	Spirol pin in zip gates sticking up
	Gripper pressure
	Gripper datum position correct / G axis parallel
	Water in Air system
	Split air pipe / air leak Faulty gripper cylinder
	Incorrect gripper for profile
	Faulty Valve
	Gasket of profile catching
	Gripper sensor wire
	Check profile spec – web where gripper sits
	Profile too cold and shatters
	Profile too wet and slips
	Correct profile loaded
	[A2001-A2004 Sturtz Grippers] Clevis pin is floating causing lock-up

          

Root Causes

Code	Description	Tick
	Gripper bent

           en none 0

Draft