Chapter 10
Dimensioning
Suggested answers for the Review Questions.
1.
Which dimension system allows dimensions to be read from the bottom and from the right?
When can a dimension be read from the left?
2.
Explain the concept of contour dimensioning.
3.
Which type of line is never crossed by another line when dimensioning an object?
4.
How is geometric analysis used in dimensioning?
5.
What is the difference between a size dimension and a location dimension?
6.
7.
Which dimension system allows dimensions to be read from the bottom and from the right?
When can a dimension be read from the left?
Sketch an example of dimensioning an angle.
8.
When are finish marks used? Draw two types.
9.
How are negative and positive cylinders dimensioned? Draw examples.
10.
How are holes and arcs dimensioned? Draw examples.
11.
What are notes and leaders used for?
12.
How does a counterbore dimension that specifies a fillet radius differ from a fillet radius
specified as part of a spotface dimension?
13.
Why is it important to avoid including superfluous dimensions?
Dimensioning
Worksheet
Chapter 10
Dimensioning
Name: _______________________________________________
1.
List the three rules students should follow to dimension properly.
2.
How is dual dimensioning used?
3.
Dimensioning is made up of two type of descriptions; name them.
4.
Although all drawings should be made to scale, you might have to indicate that a dimension is NOT
to scale. How would you identify this unique dimension?
5.
Of the three styles of finish marks, which is preferred by ANSI?
Chapter 10
Dimensioning
6.
Of the two directions of dimensioning figures, which method is the preferred method?
7.
Two methods are used when dimensioning angles. Name them.
8.
The radius of a cylinder should never be given. Explain why.
9.
A beveled or sloping edge is referred to as a:
10.
A.
chamfer
B.
taper
C.
keyway
D.
knurals
Which of the following statements about dimensioning is True?
A.
Centerlines are often extended from view to view
Chapter 10
11.
12.
13.
Dimensioning
B.
Avoid dimensioning to hidden lines and hidden features.
C.
A dimension may be attached to a single view or adjacent views.
D.
Dimension lines are often joined end to end in chain fashion with object lines.
Which of the following statements is FALSE?
A.
Avoid crossing dimensioning lines.
B.
It is OK to cross extension lines.
C.
When extension lines and center lines cross object lines, a small gap should be left.
D.
The shorter dimension are located nearest to the object outline.
Dimensions given for information only, and not intended to be measured nor govern the
manufacturing process are referred to:
A.
datums
B.
baselines
C.
starting dimensions
D.
reference dimensions
The seven basic units of measure in the international system of units (SI) are:
A.
millimeter, centimeter, decameter, hectometer, decimeter, kilometer, and meter.
B.
Kilogram, second, ampere, kelvin, mole, candela, and meter.
C.
millimeter, centimeter, meter, kilometer, hectometer, liter, and gram.
D.
Kilogram, meter, kelvin, centimeter, millimeter, gram, and liter.
Chapter 10
14.
Dimensioning
Techniques for good lettering include all the following except:
A.
Arrowheads should be drawn freehand.
B.
Arrowheads should be drawn at a ratio of 3:1
C.
Arrowheads should be drawn 1/4" long.
D.
Arrowheads indicate the extent of the dimension.
15.
Spacing of the dimension lines should be uniform throughout the drawing and at least ________
inches apart.
16.
How long should arrowheads be? _________
17.
The extension line should extend ________ beyond the outermost arrowhead.
18.
The shoulder of a leader should be approximately _______ and extend from the middle height of the
letter at the beginning or the end of the note
19.
The dimension line nearest the object should be at least _______ inch from the object.
20.
What is the size of the gap between the object and an extension line? _________
21.
T
F
The dimension to create the drawings may be different than the dimensions required
to create and inspect the part.
22.
T
F
Drawings may be dimensioned entirely with whole numbers and common fractions,
entirely with decimals, or with a combination of the two.
23.
T
F
When dimensioning figures, the standard height for whole numbers is 1/8" and for
fractions, 3/8".
Chapter 10
Dimensioning
24.
T
F
When dimensions are grouped in parallel lines, the numerals should be stacked, one
above the other.
25.
T
F
When using millimeters and meters, they are indicated by lowercase letters to the
right of the dimension.
26.
T
F
Notes are classified as "local notes" when they apply to an entire drawing.
27.
T
F
Dimensions should be attached to the view in which the dimension appears as a plan
view.
28.
T
F
Usually, location dimensions may be made from any edge being used as a
datum plane.