06/05/2026
End rolling that rolls on and rolls off — and why that distinction matters for thread quality.
Thread rolling is a cold-forming process that displaces material rather than cutting it, producing stronger tooth forms, improved surface finish, and greater precision. End rolling applies this through purely linear motion onto a rotating part.
CJWinter's 193 end-rolling attachment departs from conventional designs in one critical way: rather than springing open to clear the thread before retracting, it rolls on to create the thread, then reverses as the unit rolls off.
That difference has measurable implications:
- The roll-on/roll-off sequence creates a double-burnish, producing higher-quality thread profiles and finishes
- Eliminating the spring-open mechanism removes internal components prone to damage on hard materials
- The result is a 15-lb unit versus the 40-lb conventional alternative, reducing spindle wear over time
- Reversible thread rolls extend service life by approximately twice
Air-Way Manufacturing, the largest independent hydraulic fitting manufacturer in the United States, is currently evaluating the 193 heads on its Buffoli CNC rotary transfer machines.
Read the full piece for technical and application detail. https://www.productionmachining.com/articles/the-value-of-bidirectional-thread-rolling
