Thread surface not according to requirements

Thread surface not according to requirements
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