Tapping Faults/Causes Chart
Fault Codes
O = OVERSIZED OR BELL-MOUTHED TAPPED HOLES
P = POOR FINISH THREADS
T = TAP TEETH CHIPPING
E = EXCESSIVE RATE OF WEAR ON TAP
B = BROKEN TAP
C = COLD WELDING OR GALLING
Faults and Causes
| Cause | Fault Codes |
|---|---|
| MISALIGNMENT | O-P-T |
| TAP LEAD REGROUND OR ECCENTRIC | O |
| INCORRECT FEED RATE | O-P |
| WRONG TYPE OF TAP FOR JOB | O-P-E-B |
| BLUNT TAP | P-E-B-C |
| INCORRECT SHARPENING OF TAP | O-P-T-E-B-C |
| LACK OF OR INCORRECT LUBRICANT | O-P-E-B-C |
| TAP HITTING BOTTOM OF HOLE | T-B |
| TAP SPEED TOO HIGH | E-B-C |
| WORK HARDENED SKIN IN DRILL HOLE | E-B |
| MACHINE REQUIRES OVERHAUL | O-P-T-B |
| CHIPS NOT BEING REMOVED PROPERLY | P-B |
| TAP DRILL SIZE INCORRECT | O-B |
| MATERIAL TOO SOFT | C |
| INCORRECT MATERIAL STRUCTURE | C |
