constant period

fixed period

dwell period

idle period

surface of the top of the tooth

surface of the tooth above the pitch surface

surface of the tooth below the pitch surface

width of the tooth measured along the pitch circle

29 Degree

47.3 Degree

55 Degree

60 Degree

length of path of contact to the circular pitch

length of arc of contact to the circular pitch

length of arc of approach to the circular pitch

length of arc of recess to the circular pitch

(pZ)/(N)

(pN)/(Z)

(p)/(ZN)

(ZN)/(p)