AIT Technical Drawing 3

Question 1

What is the correct reading direction for a unilateral tolerance such as +0.005 / -0.000?

Accepted Answer

The dimension may only vary in the positive direction

Answer

A unilateral tolerance of +0.005/-0.000 means the actual size may be up to 0.005 larger than nominal but no smaller.

Question 2

On a welding symbol, where is the reference line drawn?

Accepted Answer

Horizontally, with the arrow on one end and the tail on the other

Answer

The welding symbol reference line is always horizontal; the arrow points to the joint and the tail holds supplementary information.

Question 3

What does an 'R' prefix before a dimension value indicate?

Accepted Answer

The feature is a radius

Answer

The prefix 'R' designates a radius dimension, measured from the center of the arc to its circumference.

Question 4

In a thread callout '1/2-13 UNC-2A', what does '2A' specify?

Accepted Answer

The thread class of fit — external thread with moderate allowance

Answer

In the Unified thread system, class 2A denotes an external thread with a standard allowance suitable for most general applications.

Question 5

What information is typically found in the title block of a technical drawing?

Accepted Answer

Part name, drawing number, scale, material, tolerances, and approvals

Answer

The title block consolidates essential administrative and technical information needed to identify and use the drawing correctly.

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