Machine Drawing

Blueprint Reading 263

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d:\N-Design\Des17-1.pm5

THEORY QUESTIONS

17.1 What is a blueprint and how the original drawing is prepared to take the blueprint from it?

17.2 What are the various reprographic processes that are used to take copies of the original draw-

ing?

17.3 What kind of knowledge is required for blueprint reading?

17.4 What are the two principal dimensions of an object that can be identified from (a) view from the

front, (b) view from the side and (c) view from above?

17.5 How many views are required to represent a cylindrical component?

17.6 To understand the visibility of various lines in the view from the front, in what direction, one

should see the view from above?

17.7 What kind of notes is required to describe an object, made of a plate and represented by only one

view?

17.8 Explain the instructions on the drawing in the form of the following notes:

(a) U/C, WIDE 6 DEEP 3

(b)φ20 C’ BORE FOR M19 SOCKET HD CAP SCR

(c) 4 HOLES, EQUI - SP PCD 180.

17.9 Write the note forms to indicate the following operations:

(a) to drill four holes of diameter 25 mm and depth 40 mm,

(b) to drill two holes of diameter 20 mm and countersunk to diameter 25 mm,

(c) to cut a key seat of width 6 mm and depth 3 mm on a shaft,

(d) to carburise, harden and ground, and

(e) to cut an ACME thread of pitch 4 mm on a shaft of 30 mm diameter.