CUTTING DEPTH AND THE NUMBER OF PASSES
Selection of the appropriate cutting depth and the right number of passes is vital for threading.
- For most threading, use a "threading cycle program," which has originally been installed on machines, and specify "total cutting depth" and "cutting depth in the first or final pass."
- Cutting depth and the number of passes are easy to change for the radial infeed method, thus making it easy to determine the appropriate cutting conditions.
ADVICE ON IMPROVED THREADING
Increasing tool life
- To prevent damage to the nose radius - Recommended method - Modified flank infeed.
- To have uniform flank wear on both sides of a cutting edge - Recommended method - Radial infeed
- To prevent crater wear - Recommended method - Flank infeed
To achieve highly efficient machining
- Increase cutting speed. (Dependant on the maximum revolution and rigidity of the machine.)
- Reduce the number of passes . (Reduce by 30-40%.)
- A reduced number of passes can improve chip discharge because of the thicker chips generated.