Answer
For high-volume production, manual installation of spiral retaining rings is inefficient and risks over-stressing the ring. Automated installation utilizes a tapered mandrel and a pusher (plunger). The mandrel's taper should not exceed $10$ degrees to ensure a smooth transition. The leading edge of the mandrel must be slightly smaller than the shaft diameter, and the trailing edge should match it exactly. The pusher must apply uniform axial force to the ring's circumference to prevent 'spiraling' or twisting, which can lead to permanent deformation. For internal rings, a tapered sleeve is used to compress the ring. The critical parameter is the 'push force,' which must be monitored; a spike in force indicates a misalignment that could gouge the shaft or housing.
