Detail And Assembly Drawing

INTRODUCTION

For the production of the component study of detail and assembly drawing is very important. When we need a particular component or object we give some specification and which describe its shape, size and dimensions. According to these dimensions, the designer or producer can understand and/or manufacture it.

• Detail Drawing

Drawing which enable us complete information about each part of the machine or structure is called detail drawing.

 Good detail drawing contains :

• Limits of accuracy
• Shape of part
• Grade of finish
• Material
• Number of parts required
• Number of views
• Size of the part.

• Assembly And Drawing

When all the components of the machine or any other object assembled together then the drawing of the unite is called assembly drawing, a good assembly drawing should satisfy.

• Maintenance requirement
• Operational requirement
• Manufacturing requirement.
  

• Type Of Assembly Drawing

Design Assembly Drawing : Drawing made at the time of design stage on large scale.

Layout Assembly Drawing : Drawing shows how the part to be assembly with their basic proportions and dimension.

Installation Drawing : In this drawing how to install or erect a machine or structure is highlighted. Dimension of a few important part overall dimension of assembled unit is indication.

Working Assembly Drawing : Working drawing of machine consist of detail drawing giving all necessary information for the production of individual parts, and assembly drawing shows the location of each component of the machine.

General Assembly Drawing : Show the detail drawing of the individual part, sum-assembly and the assembly drawing of the machine.

• Requirements Of Assembly Drawing

• Views : The view (either top, bottom, side) which shown all the individual components and their respective locations. Additional view can be provided only when they add necessary information.

• Sectioning : Components or parts should be sectioned (half or partial) show important or hidden details.

• Dotted Lines : Dotted lines should not be present in assembly drawing when proper section is done. In case of partial sectioned view the dotted lines may be drawn to clear the detail of the part.

• Dimensions : Overall dimensions and center to center distances made easy to understand the drawing also clear the relationship between the various components and parts.

• Bill Of Materials : The numbers marked on the drawing identifies every component of the machine on assembly drawing.

Other then these the following also describe the components details :-

1. Scale
2. Method of projection
3. Shop process
4. Name of components
5. Material of part
6. Designed checked by.

• How Can We Prepare Assembly Drawing

1. First of all, we understand the need principle of operation and application of the machine. This help in understanding the functional requirements of individual parts and their location.

2. Examine the external and internal features of individual parts.

3. Choose a proper scale.

4. Overall dimensions of the views of the assembly drawing should be estimated first, so that after drawing the views (Top, Bottom, Front, Side) leaving enough space between them for indicating dimensions and adding notes.

5. Draw axes of symmetry for all views.

6. Front should be drawn at the beginning. The main part of machine and adding rest of the parts.

7. After completing the front view, project it to draw the other necessary views.

8. Mark dimensions and part number.

9. Prepare the list of the part.

10. Add the title block.