1. By adopting a DC carbon-brush motor together with a precise electronic controlling board, JSF-820V functions a stepless variable-spindle-speed change. It is easy to reach the required main spindle speed by lightly turning the speed controller without adjusting the belt. Thus, it is able to increase efficiency and reduce cost. And, it can also perform high torsion at a low spindle speed.
2. An attached main spindle speed meter on the machines can show the speed of main spindle exactly.
