i'm new to blender but not to 3d modeling, and i'm trying to rig a 7 cylinder radial engine, everything is set: crankshaft, piston, counterweight, planetary gear made with the extra mesh add-on(it could be important cause thoses gears are working perfectly) and rigged with a rotation driver for an output of 1/6 ratio.i'm know trying to rig a hand modeled piece (the cam ring ) which spin at the same speed as the ring gear with the same driver: -(var*1/6) of the sun gear. but a rotation of 180° on the X axis of the sun gear cause a sudent jump back of 30° on the x axis of the cam ring I tried to delete the driver on the cam ring and parent it to the ring gear directly but still doing the same. Could anyone help?

I'm new to blender but not to 3d modeling, and I'm trying to rig a 7 cylinder radial engine, everything is set: crankshaft, piston, counterweight, planetary gear made with the extra mesh add-on(it could be important cause those gears are working perfectly) and rigged with a rotation driver for an output of 1/6 ratio. I'm know trying to rig a hand modeled piece (the cam ring ) which spin at the same speed as the ring gear with the same driver: -(var*1/6) of the sun gear. but a rotation of 180° on the X axis of the sun gear cause a sudden jump back of 30° on the x axis of the cam ring I tried to delete the driver on the cam ring and parent it to the ring gear directly but still doing the same. Could anyone help?