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Stepped Gear′ing.


Machinery.) An invention of Dr. Hooke for obtaining a continuous bearing between the meshing surfaces of gear-wheels.

Stepped gearing.

Each wheel is composed of two, three, or more separate sets of teeth, which, instead of being in line, are arranged in steps (a, Fig 5781). It is sometimes used for driving screw-propellers, and in connection with a rack of similar character for operating the beds of large planingmachines.

Dr. Hooke also invented the screwgearing b. This consists of a pair of wheels whose teeth are of helical form, corresponding respectively to the threads of a right-hand and a left-hand screw. The contact of each pair of teeth commences at the foremost end of the helical front, and terminates at the back part: the pitch of the helices being such that the contact of one pair of teeth does not terminate until that of the next pair has commenced, thus causing great uniformity and smoothness of motion.

Stepped key.

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