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CADD-2 Lesson 8

Screw Machine Parts, Assembly Drawings, & Manufacturing Processes

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