BEG – WEEK 2 SESSION 1
STUDY MATERIALS
Syllabus
ü 1. Demonstrate
the dimensioning and its necessity, methods, and principles,
ü 2. Sheet no.2 Dimensioning of overall sizes, circles,
threaded holes, chamfered surfaces, angles, tapered surfaces, holes, equally
spaced on P.C.D., countersunk holes, counterbored holes, cylindrical parts,
narrow spaces and gaps, radii, curves, and arches.
Principles of Dimensioning
The following are the basic principles of dimensioning:
1. All dimensional information necessary to define a part clearly and
completely shall be shown directly on a drawing.
2. Each feature shall be dimensioned once only on a drawing.
3. Dimensions shall be placed on the view or section that shows clearly,
the corresponding features
4. As far as possible, on a drawing, dimensions should be
expressed in one unit only, preferably in millimeters, without showing the unit
symbol (mm). Unit on the drawing, however, may be shown in a note
5. No more dimensions than are necessary to define a part
shall be shown on the drawing. No feature of a part shall be defined by more
than one dimension in any one direction
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