Question

What is profile error?

(a) The minimum distance of any point on the profile of tooth form and normal to the design profile when the two coincide at the reference circle

(b) The minimum distance of any point on the profile of tooth form and parallel to the design profile when the two coincide at the reference circle

(c) The maximum distance of any point on the profile of tooth form and parallel to the design profile when the two coincide at the reference circle

(d) The maximum distance of any point on the profile of tooth form and normal to the design profile when the two coincide at the reference circle

I have been asked this question in an interview for internship.

Query is from Sources of Errors in Manufacturing Gears topic in section Measurement and Testing of Gears of Engineering Metrology

Answer 1

Right answer is (d) The maximum distance of any point on the profile of tooth form and normal to the design profile when the two coincide at the reference circle

For explanation I would say: Profile error is a possible error on spur, helical or bevel gear etc. It is the max distance of any point on the profile of tooth and normal to the design profile when two coincide at the reference circle.