Question

chapter 3 questions

1. true or false: dimensions should not be duplicated or the same information given in two different ways. if a reference dimension is used, the size value is placed within parentheses (x).
2. the u.s. unit system is also known as the (ips) unit system. what does ips stand for?
3. the diameter of a hole is placed in the view in which is shown as a ____________.
4. the length and diameter of a cylinder are usually placed in the view which shows the cylinder as a ____________.
5. dimension a hole by its ____________.
6. true or false: dimensioning to hidden lines should be avoided wherever possible.
7. if a hole goes completely through the feature and it is not clearly shown on the drawing, the abbreviation ____________ follows the dimension.
8. the degree (o) may be divided into smaller units called __________. there are 60 ________ in each degree. each minute may be divided into smaller units called __________.
9. identify the symbol of a counterbore and countersunk: __________, __________.

10.identify the symbol for diameter, radius, and depth: __________, ________, __________.

Explanation:

1. This is a standard rule in technical dimensioning to avoid confusion; reference dimensions are marked with parentheses.
2. IPS is the standard acronym for the U.S. customary unit system for engineering.
3. Hole diameters are dimensioned in their circular (true shape) view for clarity.
4. Cylinders are dimensioned in their rectangular (length + diameter) view for readability.
5. Holes are defined by their diameter as the key circular measurement.
6. Dimensioning to hidden lines creates ambiguity, so it is avoided.
7. "THRU" is the standard abbreviation for a through hole when not visually clear.
8. Degrees use a base-60 subdivision system for angular measurements.
9. These are the standard GD&T symbols for counterbore and countersunk features.
10. These are the universally accepted symbols for diameter, radius, and depth in technical drawing.

Answer:

1. True
2. Inch-Pound-Second
3. circle (true circular shape)
4. rectangle (rectangular outline)
5. diameter
6. True
7. THRU
8. minutes; minutes; seconds
9. ⌴, ∇
10. ∅, R, ↧