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Unit 2
Handling your Sandex
66
1. Operating theory
SANDEX units operate based on the following principal. A globoidal cam is mounted onto the input
shaft. This cam interlocks with the turret portion of the output shaft. The turret has cam followers along
its perimeter, which are in contact with the tapered ribs on the cam. This contact or pressure is called
the preload. Turning the input shaft rolls the cam followers along the rib surfaces thereby rotating the
turret according to the curve of the cam. The turret is motionless when the ribs are parallel with the
edges of the cam although the cam followers stay in motion.
Two of three cam followers are always kept pressed against the tapered ribs to ensure an accurate
transmission of rotation. Any backlash or movement between the tapered rib surfaces and cam
followers can cause vibrations, noise, and also damage the cam and cam follower surfaces. Backlash
can be completely eliminated by rotating the eccentric flange that holds the input shaft, and minimizing
the distance between the input and output shaft.
Explanation of terms used with indexing equipment
TERM DEFINITION
Number of stops
The number of stops determined by the customer’s programming.
A predetermined number of stops have been programmed into the
controller (1-16) CW or CCW.
Index angle The index angle is dependant on the number of stops.
Dynamic Torque output
rating(Top)
The maximum torque that can be applied on the output shaft
during indexing phases. Directly related to machine life.