Answer to Question #293272 in Mechanical Engineering for Niaz

Question

A fit or assembly of pin and hole is designated by 55mm H9/d9/

a) Describe what kind of fit it is.

b) Find: i)tolerances for pin & hole ii) Deviations (Upper, Lower and Fundamental) for both hole and pin

iii) The maximum, minimum, mean and most frequent clearances.(hint: mean is the most frequent value

in normal distribution)

c) Neatly sketch the fit/assembly in a graph paper and show all the pertinent dimensions

d) Assume the natural spread and tolerance coincide for both shaft and hole. What % of fit was less than

the minimum clearance?

(find σ for shaft, hole and clearance. For the σ of clearance, use the population combination formula

mentioned in the study material named statistical considerations)

Answer 1

Answer is given below as table