9 - THREADS AND STANDARD FEATURES ENGR 111A GC-8 Learning...

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ENGR 111A GC-8 THREADS AND STANDARD FEATURES
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Learning Objectives Be able to understand threaded parts and their terminology Be able to draw threads symbols in Simplified or Schematic representations Be able to interpret and write thread notes in both Metric and English systems Be able to scale lines on engineering drawings
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Introduction Most, if not all, engineering designs require the use of certain parts and features that serve common purposes (bolts and screws, springs, gears and cams, etc). The specifications of commonly used parts have been standardized for both the US and the metric systems. Such parts are widely available in numerous forms, shapes, and sizes. They are interchangeable and relatively inexpensive. Standard parts are normally purchased from vendors instead of being designed and manufactured from scratch for every new assembly. In engineering drawings, time is not wasted drawing and dimensioning standard parts in detail. Instead, standard representations and notations have been developed for such purposes.
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Fasteners The process by which different components of a design are held or joined together is called fastening. A fastener is a mechanical device designed for this purpose. Based on its application, fasteners often receive varying degrees of precision and capabilities. Some fastening methods are intended to be permanent (welding, nailing, stapling, or gluing). Others allow for disassembly and reassembly of the design so parts can be adjusted, serviced or replaced easily (bolts, nuts, screws, and pins). The types of non-permanent fasteners commonly used in industry and defined by current standards (both ANSI and ISO) will be discussed.
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9 - THREADS AND STANDARD FEATURES ENGR 111A GC-8 Learning...

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