Introduction to Basic Manufacturing Processes and ... - always yours

474 Introduction to Basic Manufacturing Processes and Workshop Technology
ISO 9000 is becoming popular because it controls quality and saves money too. A company
may decide to use ISO 9000 for many reasons. To develop the system one has to start with
gap analysis. A gap analysis will help the enterprise to identify the gaps that exist between
the ISO 9000 standard and current processes and will tell exactly what one needs to do to
meet the ISO 9000 quality management standard. An enterprise may chose to follow this path
because it needs to control or improves the quality of products and services or to reduce the
costs associated with quality or to become more competitive. Alternatively, an enterprise may
choose this simply because its customers expect it to do so or because a governmental body
has made it mandatory.
26.10 QUESTIONS
1. What is the importance of interchangeability in fitting of mating parts?
2. Define the terms: tolerance, allowance, interference and clearance in fits.
3. Illustrate the unilateral tolerance with figures. How is the tolerance specified?
4. Which points you will keep in mind in selecting the tolerance between the piston and cylinder
of an engine?
5. Write short notes on the following:
(i) Nominal size (ii) Basic size (iii) Tolerance (iv) Allowance, (v) Hole Basis System and
(vi) Shaft basis system.
6. Write short note on unilateral system of tolerances covering the points-definition, application
and advantages over die bilateral system.
7. Describe any system of setting limits and fits.
8. State the importance of limits and fits in production of articles.
9. Give the classifications of fits between the mating parts. What type of fit you will require
between the piston rod and stuffing box.
10. Describes the various types of fits.