Lecture7 - Lecture 7 MAE 52 Lecture 8 1 Fasteners Chapter...

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Lecture 8 1 Lecture 7 MAE 52
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Lecture 8 2 Fasteners Chapter 10 Fasteners are needed to hold parts together. Threaded fasteners – such as bolts and screws – are most common. There are many different types (shcs, hex, fillister, etc) Flat head
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Lecture 8 3 Threads Thread – a projecting helical rib by which parts can be screwed together How to display schematic threads on drawings (see text) Thread terminology External Internal Major diameter Minor Diameter Pitch UNF UNC See the handout now online…
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Lecture 8 4 Detail Views Sometimes needed to dimension a small feature in a crowded space. – To create a detail view in solidworks 1. On the view, draw a circle of the region for the detail view. 2. Select Drawing > Detail View to create the view.
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Lecture 8 5 Dimensions Chapter 8 • Dimensions are used to manufacture parts and to inspect the resulting parts to determine if they are acceptable. • Drawings with dimensions and notes often serve as construction documents and legal contracts. • ANSI Y14.5M-1994 is the current standard. Other standards may apply.
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Lecture 8 6 3 Things for Good Dimensioning • Good technique of dimensioning • Good choice of dimensions • Good placement of dimensions
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Lecture 8 7 Choice of Dimensions the dimensions you specify determine the way the the part is manufactured and the way the tolerance is applied • consider the purpose of the part and its function in the assembly • consider how easy it will be to check the measurement on the actual part • fully dimension each part • do not over-dimension, each dimensions should appear only once
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Lecture 8 8 Drawing Properties Dimensioning Standard = ANSI
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Lecture 8 9 Dimensioning • There are two kinds of dimensions: – Size dimensions – how big is the feature? – Location dimensions – where is the feature? Size Dimensions Location Dimensions
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Lecture 8 10 Vocabulary Dimension line, Extension line, Leader, Dimension offset or gap, Centerline, Finish mark, Dimension value Baseline dimensioning, Chained dimensioning
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11 Tolerance Definition: The total allowable variation an acceptable part can have from the specified dimension. The less variation allowed, the more
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Lecture7 - Lecture 7 MAE 52 Lecture 8 1 Fasteners Chapter...

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