Machining the long and slender thread is preferably made by thread whirling to avoid bending and vibrations.
Thread quality is a challenge when high feeds are used in the thread whirling. Facets is a common problem.
If the thread diameter is changed, the setting angle of the whirling ring has to be changed too. Use the calculator for correct programming.
Every whirling spindle has a gear box reduction, due to size restrictions of the unit. Remember to take this into consideration. The programmed rpm will not the actual output. In our case the reduction was 50 %.
- Good surface finish
- Good dimensional accuracy
- Secure process
Machining solution (example)
|Total component length||50 mm (1.969 inch)|
|Outer thread diameter||6 mm (0.236 inch)|
|Core thread diameter||4.90 mm (0.193 inch)|
|Maximal depth of cut||1.625 mm (0.064 inch)|
Machining solution – thread whirling
The cutting data as below will give a good cutting process with acceptable
sound levels. It is possible to surpass these values, but the sound level will
increase rapidly and facets are formed.