Cam processing with closed scanning

In the case of cam processing with closed scanning, the cam profile is processed exclusively within the closed value range (= modulo range or "period") of the master axis.

It is assumed that this modulo range of the master axis is a property of the axis, i.e.: the axis keeps its position automatically within the modulo range.

Thus, there is always precisely one associated slave position for each master position. Therefore, the cam can never be scanned at an invalid position.

Only the following cam types are suitable for cam processing with closed scanning:

Cams (a) whose velocity integral in the definition interval is exactly equal to zero, e.g. for limited oscillating motion.
Cams (b) whose velocity integral in the definition interval corresponds to the modulo range of the slave axis, e.g. for endlessly rotating cranks.

Processing of any cam by means of closed scanning that does not correspond to the definition above leads to abrupt position changes of the slave axis whenever the master position exceeds a modulo limit.

Quasi mechanical coupling between the master and slave positions with cam types a and b

When scanning the cam type "a", nothing needs to be observed when the master passes through the modulo limit.

When the cam type “b” is scanned and when the master passes through the modulo limit, make sure that the slave position is corrected by a modulo range (see Section Closed processing for an endlessly rotating slave axis).