Assembly and Details machine drawing pdf • 1. CHAPTER - 06 ASSEMBLY AND DETAILS DRAWING.

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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. Examine thoroughly, the external and internal features of the individual parts. Choose a proper scale for the assembly drawing. 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.

Draw the axes of symmetry for all the views of the assembly drawing. 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.

Project the other required views from the view from the front complete views. Mark the location and overall dimensions and add the part numbers on the drawing.

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. Study the functional aspect of the unit as a whole. This will enable to understand the arrangement of the parts.

Visualize the size and shape of the individual components. 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. 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. 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. Check the dimensions of the mating parts.

Prepare the parts list.

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