Thread surface not according to requirements
BACK
| Possible causes | Solution |
| cutting edge geometry not suitable for the application | apply “correct” tap for the material to be machined |
| cutting speed too high | - reduce cutting speed - optimise lubrication |
| insufficient coolant (concentration and supply) |
ensure suitable coolant and sufficient volume |
| chip congestion | apply suitable tap type |
| tapping size hole too small | observe tapping size hole diameter specifications to DIN 336 or respective standards. Observe table for fluteless taps |
| with tough, hard materials loading on tool too much or pitch too steep | apply hand tap sets |
| built-up edge | apply coated tap |
| cold welding | improve coolant supply |