Page 104 - Module DMV20173

5. 0 JOINING PROCESSES

5.7 MECHANICAL FASTENING

1. Bolts, screws, and nuts are among the most commonly used threaded fasteners.
2. If the joint is to be subjected to vibration (such as in aircraft, engines, and machinery),
several specially designed nuts and lock washers are available.
3. Mechanical fasteners consists with two types : Permanent and Non Permanent (Figure
5.14).

Figure 5.14 Permanent and non-permanent fastening systems.

Example 5.3
Describe the considerations in choosing mechanical fastening as a joining method than
welding.

Solution:

Mechanical fastening may be preferred for the following reasons:

1. Ease of manufacturing.

2. Ease of assembly and transportation..

3. Ease of part replacement, maintenance, or repair.

4. Ease in creating design that require movable joint (e.g. hinges, sliding mechanism).

5. Lower overall cost of manufacturing the product.

BPLK 136 DMV 20173