Automation System
Straight-line operations:

All of these
must be parallel to one of the axes of the coordinate system
can include diagonal cuts if they aren't curved
None of these
must be limited to two per workpiece

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Automation System
A stepping motor;

has a commutator
can index positional movement.
None of these
has a speed proportional to voltage input
is a good choice where continuous rotation is needed

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Automation System
Stepping motors:

do not require commutators
can run at varying speeds
can be built to index different amounts by changing the pole configuration
All of these
can run both clockwise and counterclockwise

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