HOW IT WORKS

The workpiece is automatically loaded on the carrier, centered on the primitive diameter with some pins jointly liable to the carrier going in the tooth valley.
Afterthat the arms close with a rotary and axial movement, clamping the workpiece. The mechanism moving the arms is tilting to achieve a correct stirruping effect.
Carrier and arms are driven separately, therefore it's needed a double cylinder.
In such a way the machine can machine the gear hole. 
When you need to machine the synchronizer tape the carrier keep on clamping the part while the arms open and recover leaving space for the tools or the wheel.