DRWG120-Thread_Fastener

DRWG120-Thread_Fastener - Threaded Fasteners TOPICS...

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Threaded Fasteners
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TOPICS Introduction Thread terminology Thread drawing and dimensioning Threaded fastener
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Introduction
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FASTENING TYPE 1. Permanent Welding Welding Gluing Gluing Riveting Riveting
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FASTENING TYPE 2.1 Threaded fastener - bolts - studs - screws 2. Temporary 2.2 Non-threaded fastener - keys - pin key
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THREAD APPLICATION 1. To hold parts together. 2. To move part(s) relative to others. Part A Part B Part C
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THREAD APPLICATION 1. To hold parts together. 2. To move part(s) relative to others. Wood working vise Palm fruit pressing machine
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Thread Terminology
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External (male) thread Internal (female) thread THREAD TERMINOLOGY A thread cut on the outside of a cylindrical body. A thread cut on the inside of a cylindrical body. Internal thread External thread
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Right-hand thread Thread that will assemble when turned clockwise . Left-hand thread Thread that will assemble when turned counter-clockwise . THREAD TERMINOLOGY Turnbuckle use RH and LH thread at each end to double displacement.
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Crest Root Thread angle THREAD TERMINOLOGY The peak edge of a thread. The bottom of the thread cut into a cylindrical body. The angle between threads faces. Internal Thread External Thread Crest Root Thread angle Crest Root
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Major diameter The largest diameter on an internal or external thread. Minor diameter The smallest diameter on an internal or external thread. Internal Thread External Thread Minor dia. Major dia. THREAD TERMINOLOGY
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Pitch The distance between crests of threads. Lead The distance a screw will advance when turned 360 o . THREAD TERMINOLOGY Internal Thread External Thread Pitch Pitch
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Form is the profile shape of the thread. Thread Form THREAD TERMINOLOGY Example : “knuckle thread form”
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EXTERNAL THREAD CUTTING Tools Operation Threading Die Die stock
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Twist drill Tools Tap Tap wrench Operation INTERNAL THREAD CUTTING
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COMPARISON OF THREAD CUTTING External Thread Internal Thread Major Dia. Minor Dia.
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Thread Drawing
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1. Detailed Detailed representation representation 2. 2. Schematic Schematic representation representation 3. 3.
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DRWG120-Thread_Fastener - Threaded Fasteners TOPICS...

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