The Egyptian Academy of Engineering and Advanced Technology
Second year of Mechanical
Engineering (Mechatronics)
MEC 131: Machine Part Design
Exercise Sheet (1)
Fits and Tolerances
Student Name:
Student ID:
Section No.: Date:
Score:
2019-2020
The Egyptian Academy of Engineering and Advanced Technology
Second year of Mechanical
Engineering (Mechatronics)
MEC 131: Machine Part Design
Exercise Sheet (1)
Fits and Tolerances
1. Define the terms: (a) basic size, (b) limits, (c) allowance, (d) tolerance and (e)
deviation.
2. What is an unilateral tolerance and what is a bilateral tolerance?
3. What is meant by the term “fit” and how are fits classified?
4. Differentiate between clearance fit and transition fit.
The Egyptian Academy of Engineering and Advanced Technology
Second year of Mechanical
Engineering (Mechatronics)
MEC 131: Machine Part Design
5. For the fit Ø100 H8/f7:
(a) Draw the position of tolerance fields for shaft and hole with respect to zero line.
(b) Determine the type of fit.
(c) Mark and calculate values of max. and min. clearance or interference.
(d) Explain the meaning of each letter and digit used to describe the fit Ø100 H8/f7.
(e) Determine the low and high limits of hole and shaft.
(f) Write the numerical values of dimensions of hole and shaft.
The Egyptian Academy of Engineering and Advanced Technology
Second year of Mechanical
Engineering (Mechatronics)
MEC 131: Machine Part Design
6. Draw the following fits and determine the type of each one:
(a) Ø120 H7/r6
(b) 90 T7/h6
(c) 150 H8/j7
The Egyptian Academy of Engineering and Advanced Technology
Second year of Mechanical
Engineering (Mechatronics)
MEC 131: Machine Part Design
7. The dimensions of a shaft and a hole are given below:
Shaft, Basic size = 60mm and given as
Hole, Basic size = 60mm and given as
Find out:
(a) Tolerance of shaft
(b) Tolerance of hole
(c) Maximum allowance
(d) Minimum allowance
(e) Type of fit
mm
mm
The Egyptian Academy of Engineering and Advanced Technology
Second year of Mechanical
Engineering (Mechatronics)
MEC 131: Machine Part Design
8. A 30mm diameter hole is made on a turret lathe to the limits, 30.035 and 30.00. The
following two grades of shafts are used to fit in the hole:
(a) φ 30 e5 mm,
and
(b) φ30 s8 mm.
Calculate the system tolerance and indicate the type of fit in each case by a sketch.