engr 111a 9.2 tolerance

engr 111a 9.2 tolerance - ENGR111AFall2009 October28,2009...

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Tolerances ENGR 111 A            Fall 2009   Class 9.2 October 28, 2009
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Tolerance ??? What does the word “Tolerance” mean to you? The dictionary defines tolerance as: tol·er·ance: n. 2.a. Leeway for variation from a standard. b. The permissible deviation from a specified value of a structural dimension, often expressed as a percent. Paraphrased to “Tolerance is how accepting of errors you are”.
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General Concepts A measurement with a zero tolerance is impossible to manufacture in the real world Tolerances on parts contribute to the expense of a part, the smaller the tolerance the more expensive the part
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Types of Tolerances General Tolerances - limit the error a machinist is allowed on all dimensions, unless otherwise specified Linear Tolerance - specific error limits for a particular linear measurement Geometric Tolerances - Error limits, not on the size, but on the shape of a feature
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General Tolerance Are specified in the title block of a drawing
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Linear Tolerance Is an overriding tolerance which specifies a tolerance for one specific dimension Can be listed in limit or deviation form, but normally should be specified on an engineering drawing in limit form Should only be used in the case of real necessity, not just because
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Example of Linear Tolerance The parts shown to the right illustrate the proper form of linear tolerance shown in limit form.
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8 “Forms” of Linear Tolerance Unilateral.
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This note was uploaded on 04/04/2011 for the course ENGR 111 taught by Professor Walker during the Fall '07 term at Texas A&M.

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engr 111a 9.2 tolerance - ENGR111AFall2009 October28,2009...

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