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CADD-2 Lesson 8
Screw Machine Parts, Assembly Drawings, & Manufacturing Processes
| Text | Definition |
|---|---|
| Working Assembly Drawing | A drawing describing how mating parts are assembled with detailed information about each part |
| Bills of Materials | or Parts List, the listing of parts on an assembly drawing with a brief description and quantity required. |
| Detailed Drawing | a drawing with specific information about an individual part. |
| Reference Assembly Drawing | A drawing indicating how a part is assembled and includes a BOM’s but only . |
| Attributes | allows you to store information about a product within the drawing. (Similar to XREF’s) |
| Exploded Assembly Drawing | Created as a 3D or Isometric view with parts separated to show how the product is to be assembled. |
| Tolerance | Acceptable variation from a standard size. |
| Dimension | A distance between two points, lines or planes. The size of a circle or arc. |
| Notes | Specifications for the drawing such as material, finish, or special operations. |
| Surface Finish | The finish applied by smoothing the outer surface to a specified finish.. |
| Concentricity | The condition of being concentric within a tolerance zone expressed as TIR. |
| Taper | A gradual reduction in thickness or width. |
| Slot | A long narrow groove or aperture. |
| Keyway | A groove or slot in a shaft or hub into which a key fits. |
| Knurls | To roughen or indent a rounded surface so that it can be held or turned by hand. |
| 3 types of Knurls | Straight, Diagonal, Diamond |
| Plating | A thin layer, coating, or covering of metal or of metal plates. |
| Investment Casting | An ancient method of forming metals into the desired shape |
| Drill Press | Machine used to drill holes, etc. |
| Reaming | Process used to create a more accurate hole than a standard drill bit. |
| Deburr | Removing the sharp edges of an object. |
| Tap | Used to cut threads in a part |
| Fastener | Device used to hold parts together. |
| Pitch | 1 over the number of threads per inch. |
| Bilateral Tolerance | Variation permitted in both directions |
| Unilateral Tolerance | Variation permitted in one direction. |
| 3 Types of thread representation | Simplified, Schematic, Detailed |
| Crest | Top of the thread |
| Root | Bottom of the thread |
| Pitch | Distance measured from one point on the thread to a corresponding point on the next thread. |
| Lead | Distance traveled during one complete revolution of a thread. |
| Nominal Diamter | The general designation for the diamter of the thread. |
| Helical Angle | The angle at which th thread is cut. |
| Lathe | A type of Machine Tool that rotates the piece of work against the edge of a cutting tool to form the desired diameter. |
| Sand Casting | The mold that gives the metal the desired shape is made of sand and is one of the oldest metal forming techniques known. |
| Die Casting | Process in which molten metal is forced into a die under pressure and the pressure is maintained until the metal solidifies. |
| Permanent Mold Casting | A metal mold used for repeated production of of similar castings. |
| Injection Molding | Plastic Pellets are melted, injected into the mold cavity, and allowed to cool to form the part. |
| Tabulated Drawing | A detailed drawing for standard parts that come in a range of sizes |
Created by:
tmurphy
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