Deck 23: Metric System Dimensioning and Iso Symbols

Question 1

Explain why a part designer has the practice of rounding off dimensions to the nearest even decimal.

Answer 1

When dimensions on a drawing need to be divided, the part designer tries to round off the dimensions to the nearest even decimal. This practice permits parts to be economically machined to tolerances within a required number of decimal places.

Question 2

In the accompanying figure, the item identified as number 3 is a(n) ____.

A) projection symbol
B) reduction symbol
C) limit symbol
D) accuracy symbol

Answer 2

A

Question 3

The prefix ____ means one hundred times greater.

A) deka
B) milli
C) hecto
D) kilo

Answer 3

C

Question 4

____ default practice allows aligned decimal millimeter dimensions. Both standards are used throughout North America.

A) IEC
B) ANSI
C) ISO
D) IETF

Question 5

What are the two mathematical methods used to find equivalent dimensional values in other systems?

Question 6

Explain how to round off decimal dimensions.

Question 7

Discuss why the International Organization for Standardization recommends the use of projection symbols.

Question 8

Explain the practice for unilateral millimeter tolerancing on ISO metric drawings.

Question 9

____ recommends decimal-inch dimensioning and notes on U.S. drawings to be unidirectional.

A) IEC
B) ANSI
C) ISO
D) IETF

Question 10

Production costs are related directly to the ____ required to produce a part.

A) staffing
B) time
C) quality of materials
D) degree of accuracy

Question 11

Briefly describe the ANSI and ISO drafting standards.