Print Reading Unit 8

A screw thread follows a(n) ____ path around a cylindrical surface.

• involute

• cylindrical

• 
  spiral

• helical

An external thread is a thread on the outside of a shaft.

• True

• False

Computer-generated orthographic views of threads often use a schematic representation.

• True

• False

Double threads can also be referred to as two-start threads.

• True

• False

Inch screw threads are classified by how precise they are made, with 2 being most common, 1 being less precise, and 3 being more precise.

• True

• False

Standard thread form

• Unified thread

• Multiple-start thread

• Reverse thread

• Detailed representation

The top edge or surface of a ridge

• Root

• Pitch

• Crest

• Lead

Screw threads as they would appear in true projection

• Unified thread

• Detailed representation

• Major diameter

• Minor diameter

Root-to-root measurement across the diameter of the cylinder

• Multiple-start thread

• Crest

• Minor diameter

• Detailed representation

Crest-to-crest measurement across the diameter of the cylinder

• Minor diameter

• Major diameter

• Lead

• Pitch