A Keyway is a slot in the bore of a gear corresponding to the slot milled in the diameter of a shaft that fits (usually tightly) together with a square (or rectangular) key aligned with the two slots, eliminating slippage between the two members. There is usually on keyway, but often there is two at 90, 120, or 180 degrees apart. Sizes as large as 4” wide can be manufactured. Odd sizes and metric sizes can also be produced.
Splines are sometimes used instead of key and keyway
Straight splines are multiple keyways in the bore (usually six out of ten is also fairly common) driving multiple keys equally spaced on the shaft. The major and minor diameters are curved (instead of straight as in actual keyways). There is often minimal clearance between major diameters and minor diameters of the mating parts.
If you are looking for custom made manufacturing services of worms gears or emergency repairs, contact us for more information or to schedule your service.