1. Speed of Main Drum : Max. 60rpm (Working 40rpm) 
2. Spiral Wire : Ø3~5mm 
3. Transformer : 85 or 130KVA 
4. Welding method : Spot welding 
5. Coolant : Direct water circulation 
6. Pitch Change : Pulse pick-up 
7. Control  : Inverter(3EA) + PLC