Checklist of root causes for gripper slip issues
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 | ||
Draft
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