Interference
Parallel gears - Geometric study

Geometric interference

Interferences are phenomena that occur either during the generating operation (hobbing, grinding, etc.), or during the meshing of a pinion with a wheel, under unfavorable conditions such that certain useful parts of the profile are trimmed by the tool, or that the conjugate profiles of pinion and wheel tend to penetrate each other at certain times. Let's start with the most striking case of hobbing interference.

Figure 21 shows three conditions for generating a pinion with a circular tool of generating profile P₀ .

a ) The extreme point of action A ₀ is located between I and T (figure