Cam Ring Slot Grinder
Sometimes we find it necessary to slightly 'tweak' the slots in a cam ring which control the advance and retard positions and range. Using a small angle grinder and stand as the basis, we made this slot grinder to enable this work to be carried out in a controlled manner.
The modifications we have made allow both radial and axial slots to be ground. The cam ring holder can be either rotated or moved in a linear direction. One of these operations is locked while the other is in use. The picture below left shows how a series of plunge cuts can be made and then the base of the wide slot is flattened out by rotating the cam ring holder between a pair of adjustable stops. The picture below right shows how an axial slot is ground, again with a series of plunge cuts and then linear movement of the cam ring holder up to an adjustable stop flattens the bottom of the slot.