Stepping motors are used to drive the two axes of an insertion machine used for electronic assembly.

Question:

Stepping motors are used to drive the two axes of an insertion machine used for electronic assembly. A printed circuit board is mounted on the table which must be positioned accurately for reliable insertion of components into the board. Range of each axis = 700 mm. The lead screw used to drive each of the two axes has a pitch of 3.0 mm. The inherent mechanical errors in the table positioning can be characterized by a Normal with standard deviation = 0.005 mm. If the required accuracy for the table is 0.04 mm, determine
(a) The number of step angles that the stepping motor must have, and
(b) How many bits are required in the control memory for each axis to uniquely identify each control position. Distribution
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