In my design, I've been using several indexing boxes from the Japanese company "Sankyo Seisakusho". The model of the indexing box is "SANDEX". It is a generic name for our cam units that combine a simple and ideal indexing mechanism, the "Roller gear cam mechanism". Sankyo's original cam technology, consisting of a roller gear cam and a follower spider (turret) is used to complete the units. SANDEX indexing units have always enjoyed high sales and are responding to industrial needs where the new technologies are evolving.
The indexing units must accommodate three types of basic motion -- that is the indexing drives with an intermittent rotating motion, the oscillating drives with their oscillating rotating motion, and the roller drives with a continuous rotating motion. SANDEX units have a higher number of indexes, index angle, and degree of design freedom than other indexing mechanisms. They are more rigid and have higher output values relative to the size of the unit, and they can eliminate backslash completely, performing at high-speed. A broad lineup of models and sizes will meet the needs of automated rotary machines of all sizes and specifications from the world smallest miniature indexes to the largest class of super-size indexes.
In addition, one model with parallel input/output shafts is also available, using a parallel mechanism as an "ideal flat cam". This is optimum for Conveyer drives with a large feed pitch or indexing drives with relatively long stopping interval.
This is the example of indexing movement (intermittent rotation).
More details about how to select the indexing drive and calculation example, please visit Ezy Mechanic.