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Unformatted text preview: Lecture 10 1 Lecture 10 MAE 52 Lecture 10 2 Tolerancing in SolidWorks • Set the tolerance in the dimension form. Lecture 10 3 Chain versus Baseline p 217218 The two schemes apparently are no different until you consider tolerances. If a tolerance of +/ 0.01 is applied to each dimension what is the overall distance to the center of the right most circle. Using the chain dimensioning scheme the tolerances are cumulative so the answer is 55 +/ 0.03. Using the baseline dimensioning scheme the dimension is specifically stated so the tolerances do not add up and the answer is 55 +/ 0.01. An improvement in accuracy has been achieved with no tightening of tolerances and no extra cost. In general baseline dimensioning is more accurate and should always be used except when chain dimensioning better reflects the critical dimensions. Lecture 10 4 Types of Tolerances • General Tolerances General Tolerances – L imit the error a machinist is allowed on all dimensions, unless otherwise specified. Place in the title block. • Linear Tolerances Linear Tolerances – Specific error limits for a particular linear measurement. • Geometric Tolerances Geometric Tolerances– Error limits, not on the size, but on the shape of a feature. (After midterm) Lecture 10 5 Definitions • Nominal Size  The approximate size of a part. • Actual Size  The measured size of a finished part. • Basic Size  The exact theoretical size for a part, used to calculate the acceptable limits. • Hole Basis  A system of fits based on the minimum hole size as the basic diameter. • Angular Tolerance – Angular Tolerances are used to position angular features – Example: a hole at 30 degrees from horizontal – Measured in degrees, fractions of degrees or minutes/seconds of degrees. Lecture 10...
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This note was uploaded on 02/12/2010 for the course MAE 19010 taught by Professor Norton during the Spring '07 term at UC Irvine.
 Spring '07
 Norton

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