In the wake of covering this segment you will realize how to do the accompanying: Utilize ordinary dimensioning methods to portray size, shape and areas on an designing drawing.
Make and read at a predefined scale. Make drawings utilizing metric, designing and planner scales. Effectively place measurement lines, expansion lines, points and notes. Perceive adjusted and unidirectional measurement frameworks. Measurement circle, circular segments and slanted surfaces. Apply finish images and notes to a drawing.
We have all heard the “rule of thumb”. At one time, an inch was defined by the width of a man’s thumb, and a foot, simply was the length of a man’s foot.
DIMENSION LINES AND EXTENSION LINES
Dimension Lines: A thin, dark, solid line terminated by arrowheads, which indicate the direction and extent of a dimension.
Extension Lines: A thin, dark solid line that “extends” from a point on the drawing towhich a dimension refers.
LOCATION AND SIZE DIMENSIONS ON A DRAWING
Shape description:
What does the object look like? The Shape of the object.Size Dimensions:
How big or small is something? For example, what is the size of the
circle being drilled through the block? How big is that block, what is it’s size?
Location Dimensions:
Where should that hole be drilled through the block?
Dimensions on a drawing need to be exact and clear
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Dimensions on a drawing should be given so workers building or fabricating the part do not have to assume anything, measure anything, and dimensions given should always be to points or surfaces accessible to the worker.
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Dimensions should not be duplicated or excessive .
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Drafters should be familiar with and understand the materials used in their parts so they can exercise proper judgment in the engineering matters itself.
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