Below is a video of a finishing cut being performed by a gear cutter with a myCNC controller, provided to us by a client of ours. As can be seen, the spindle and the rotation axis sync up to make sure the cutting is resumed at the exact position it was stopped at, allowing for a highly precise finishing cut to be performed. In order to prevent slip on the rotation axis, the synchronization is done at lower speeds, and, once the two have been synchronized, the gear cutter is brought back to its original cutting speed:

Without this synchronization system in place, only one precise cut would have been possible, while the myCNC syncronization allows for an arbitrary number of cuts to be performed by allowing to position the spindle and the rotation axis at the exact position required.