, 'involute gears' and 'cycloid gears', based on the difference in tooth shape. Both types have their own advantages, but technology blogger lcamtuf explains the advantages of involute gears.

the tools for generation of involute gears can be produced with high precision, (ii) it is easy to vary the tooth thickness and provide a nonstandard center distance just by changing tool settings for ...

THE FOLLOWING TABLES GIVE THE TOOTH PROPORTIONS AND THE INCREASE IN CENTER DISTANCE FOR PINIONS OF FROM 5 TO 14 TEETH, BASED UPON THE BASIC RACK OF THE 20 FULL DEPTH INVOLUTE SYSTEM ... THE MATING ...