ENG 004 Lecture 16, Nov 19, 2012

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Topics

Runout

Gage Block Example

Five Step Process

  1. Isolate and define the functions of the feature/part.
  2. Prioritize the functions.
  3. Identify the datum reference frame based on the functional properties and control the datum features.
  4. Select the proper control.
  5. Calculate the tolerance values.

Rail Mount Example

Rail Mount Example

Working Drawings

Other Names

Detail drawings, production drawings, final drawings

Definition

The complete set of standardized drawings specifying the manufacture and assembly of a product based on its design.

Working drawings are either multi-view drawings of a single part providing all the detail necessary to manufacture the part of an assembly drawing showing how previously manufactured parts are put together.

Includes: detail drawings of each non-standard part, an assembly or subassembly drawing showing all the standard and nonstandard parts in a single drawing, a bill of materials, a title block.

Assembly drawings

are sometimes represented as an exploded pictorial drawing.

Specifications

Written instructions

ANSI Paper Size

ISO Paper Size

Scale

Views should be scaled to fit on the paper.

Block in boundaries of views to space

Stay within the borders

Views should be aligned, if not they should be labeled

Common Scales

English

  • 1 = 1: Full
  • 1 = 2: Half
  • 1 = 4: Quarter
  • 1 = 8: Eighth
  • 1 = 10: Tenth
  • 2 = 1: Double

Metric

  • 1:1 Full
  • 1:2 Half
  • 1:5 Fifth
  • 1:10 Tenth
  • 1:20 Twentieth
  • 1:50 Fiftieth
  • 1:100 Hundredth

Title Blocks

Used to record all the important information necessary for the working drawings.

Common Elements in Title Blocks

Title Block Standards

Example Working Drawings

Example Working Drawings

External Threads

Internal Threads

Simplified Threads

English Threads

Metric Threads

Tap Dimensions

Hole Types

Rivets

Keys and Keyways

Pins

Springs

Gears

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