Assembly Drawing

Only available on StudyMode
  • Topic: Drawing, Bill of materials, Technical drawing
  • Pages : 9 (1352 words )
  • Download(s) : 145
  • Published : October 14, 2012
Open Document
Text Preview
Chapter 12 Assembly Drawings

Topics Exercises

Copyright ©2007 by K. Plantenberg Restricted use only

Assembly : Topics
Summary 12.1) Definitions 12.2) Views Used in Assembly Drawings 12.3) Things to Include/Not Include 12.4) Standard Parts - Specifications for General Fasteners - Specifications for Bolts and Nuts (Advanced Topic)

Copyright ©2007 by K. Plantenberg Restricted use only

Assembly: Exercises
Exercise 12-1: Section lines in assemblies Exercise 12-2: Working drawing package

Copyright ©2007 by K. Plantenberg Restricted use only

Assembly Drawings

Summary

Copyright ©2007 by K. Plantenberg Restricted use only

Summary
What will we learn in Chapter 12?
→ How to create an assembly drawing. → How to create a standard parts sheet.

Key Points.
→ Assembly drawings show how individual parts fit together to make a machine. → A standard parts sheet contains purchased items. Copyright ©2007 by K. Plantenberg Restricted use only

Assembly Drawings

12.1) Definitions

Copyright ©2007 by K. Plantenberg Restricted use only

Assembly Drawing
What is an assembly drawing and why do we need them?
An assembly drawing is a drawing of an entire machine or system with all of its components located and identified. We need to know how to put the machine together.

Copyright ©2007 by K. Plantenberg Restricted use only

Parts List (Bill of Materials)

Part#’s

Subassembly Drawing
Subassembly: Two or more parts that form a portion of an assembly. Can you think of some examples of subassemblies? → A car differential → A motorbike engine → A compressor in an AC

Copyright ©2007 by K. Plantenberg Restricted use only

Definitions
Does an assembly drawing normally show size?
No. Its job is to locate parts.

How do we show the size of an individual part?
A detail drawing is a drawing of an individual part, which includes an orthographic projection and dimensions. Copyright ©2007 by K. Plantenberg Restricted use only

Working Drawing Package
Working Drawing Package: A packet of drawings that gives the specifications necessary to manufacture a design. A typical working drawing package A standard part sheet includes; contains information about → an assembly drawing, purchased items and will not → detailed drawings, be discussed in this course. → and a standard parts sheet. Copyright ©2007 by K. Plantenberg Restricted use only

Drawing Order
Drawings included in a working drawing package should be presented in the following order. → → → → → Assembly drawing (first sheet) Part Number 1 Part Number 2 .... Standard parts sheet (last sheet)

Copyright ©2007 by K. Plantenberg Restricted use only

Assembly Drawings

12.2) Views Used in Assembly Drawings

Copyright ©2007 by K. Plantenberg Restricted use only

Selecting Views
Does an assembly drawing need a FRONT, TOP and RIGHT SIDE view? Sometimes

We need as many views as it takes to identify and locate each part. →It may only take one view.

Copyright ©2007 by K. Plantenberg Restricted use only

Needed 3 views to locate all of the parts.

Needed only 1 view to locate all of the parts.

Sectional Views
Sectional views are used quite often when drawing assemblies. Why? Assemblies often have parts fitting into or overlapping other parts and we need to look inside the assembly to see clearly.

Copyright ©2007 by K. Plantenberg Restricted use only

Section Hatch in Assemblies
Section Hatch: Section hatch in adjacent parts are drawn in opposing directions. → In the largest area, section hatch are drawn at 45° → Next largest = 135° (- 45o) → Additional areas = 30° and 60° → Smaller areas = The distance between the section hatch may also be varied to further distinguish between parts. Copyright ©2007 by K. Plantenberg Restricted use only

Exercise 12-1

Section hatch in assemblies

Copyright ©2007 by K. Plantenberg Restricted use only

Exercise 12-1
Draw the section hatch for the assembly...
tracking img