Yong Yao rack has what kind of characteristics

(1) Since the rack tooth profile is a straight line, each point on the tooth profile has the same pressure angle and is equal to the tooth profile angle of inclination, which is called the tooth profile angle with a standard value of 20 °.

(2) The same pitch and modulus on any straight line parallel to the addendum line.

(3) The straight line parallel to the tooth top line and the tooth thickness equal to the tooth width is called the index line (center line), which is the reference line for calculating the rack size.