Definitions
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.
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.
Subassembly: Two or more parts that form a portion of an assembly. Can you think of some examples of subassemblies? (add interactivity)
Working Drawing Package: A packet of drawings that gives the specifications necessary to manufacture a design. A typical working drawing package includes an assembly drawing, detailed drawings and a standard parts sheet (A standard part sheet contains information about purchased items and will be discussed later.)
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)