The interference is inherently absent.

The variation in centre distance of shafts increases radial force.

A convex flank is always in contact with concave flank.

The pressure angle is constant throughout the teeth engagement.

(Length of the path of approach/Circular pitch)

(Length of the path of recess / Circular Pitch)

(Length of the arc of contact / Circular pitch)

(Length of the arc of approach / cos 0)

Agree

Disagree

?₁.?₂.r

( ?₁ - ?₂)r

( ?₁ + ?₂)r

( ?₁ - ?₂)2r

line or point contact

surface contact

zero contact none of these

none of these