Assembly and Details

CHAPTER - 06 ASSEMBLY AND DETAILS DRAWING.
A] STEPS TO DRAW ASSEMBLY DRAWING FROM DETAILS DRAWING:-
1. Understand the purpose, principle of operation and field of application of the given machine.
This will help in understanding the functional requirements of individual parts and their
location.
2. Examine thoroughly, the external and internal features of the individual parts.
3. Choose a proper scale for the assembly drawing.
4. Estimate the overall dimensions of the views of the assembly drawing and make the outline
blocks for each of the required view, leaving enough space between them, for indicating
dimensions and adding required notes.
5. Draw the axes of symmetry for all the views of the assembly drawing.
6. Begin with the view from the front, by drawing first, the main parts of the machine and then
adding the rest of the parts, in the sequence of assembly.
7. Project the other required views from the view from the front complete views.
8. Mark the location and overall dimensions and add the part numbers on the drawing.
9. Prepare the parts list.
B] STEPS TO DRAW PART OR DETAILS DRAWING FROM ASSEMBLY
DRAWING:-
1. Understand the assembly drawing thoroughly, by referring to the parts list and the different
orthographic views of the unit.
2. Study the functional aspect of the unit as a whole. This will enable to understand the
arrangement of the parts.
3. Visualize the size and shape of the individual components.
4. As far as possible, choose full scale for the drawing. Small parts and complicated shapes may
require the use of enlarged scales so that their presentation will have a balanced appearance.
5. Select the minimum number of views required for describing each part completely. The view
from the front selected must provide maximum information of the part.
6. The under mentioned sequence may be followed for preparing different views of each part :
(i) Draw the main centre lines and make outline blocks, using the overall dimensions of the
views.
(ii) Draw the main circles and arcs of the circles.
(iii) Draw the main outlines and add all the internal features.
(iv) Cross-hatch the sectional views.
(v) Draw the dimension lines and add dimensions and notes.
7. Check the dimensions of the mating parts.
8. Prepare the parts list.

1] PLUMMER BLOCK (PEDASTAL BEARING)

3] ASSEMBLY OF LATHE TAIL-STOCK

3] DETAILS OF LATHE TAIL-STOCK

4] ASSEMBLY OF GLAND &STUFFING BOX

4] DETAILS OF GLAND & STUFFING BOX

7] ASSEMBLY OF REVOLVING CENTRE

7] DETAILS OF REVOLVING CENTRE

8] ASSEMBLY OF MILLING MACHINE TAIL-STOCK

8] DETAILS OF MILLING MACHINE TAIL-STOCK

10] ASSEMBLY OF NON-RETURN VALVE

10] DETAILS OF NON-RETURN VALVE

11] ASSEMBLY OF FEED CHECK VALVE

11] DETAILS OF FEED CHECK VALVE

12] ASSEMBLY OF PRESSURE RELIEF VALVE

12]DETAILS OF PRESSURE RELIEF VALVE

14] ASSEMBLY OF SQUARE TOOL POST

14] DETAILS OF SQUARE TOOL POST

16] ASSEMBLY OF INDEXING DRILL JIG

16] DETAILS OF INDEXING DRILL JIG

17] ASSEMBLY OF LEVER SAFETY VALVE

17] DETAILS OF LEVER SAFETY VALVE

18] ASSEMBLY OF SPRING LOADED RELIEF VALVE

18] DETAILS OF SPRING LOADED RELIEF VALVE

21] ASSEMBLY OF SELF CENTRING CHUCK

21] DETAILS OF SELF CENTRING CHUCK

22] ASSEMBLY OF FOUR JAW CHUCK

24] DETAILS OF STEAM ENGINE CROSSHEAD

24] ASSEMBLY OF STEAM ENGINE CROSSHEAD

25] DETAILS OF CRANE HOOK
Note: - Dimensions of assembly and details drawing are different.

Assembly and Details

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