Worm wheels are similar to helical gears cut to conform to the shape of the worm.

More Questions from Gears and Cams

• Proportions and shapes of gear teeth are not standardized.
• In working drawings with teeth cut to a standard shape, individual teeth typically are not shown.
• Bevel gear teeth have the same involute shape as teeth on spur gears but are tapered toward the cone apex.
• On detail drawings, the worm and gear are usually drawn in the same detail drawing.
• Gears are used to transmit power and rotating or reciprocating motion from one machine part to another.
• Cams are used to produce regular repeating motions.
• The motion of the follower as it rises or falls depends on the shape of the curves in the displacement diagram.
• Teeth are spaced by laying out equal angles.
• A worm is a screw with a thread shaped like a rack tooth.
• Working drawings for bevel gears give both the dimensions of the gear blank and the data necessary for cutting the teeth.

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