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CAM developer Robert Grzesek wrote a fabulous guest post for us on how to choose your stepover for 3D work. Ans: Form tolerances are applicable to single individual features or elements of single features. Form tolerances are not related to datum. Ans: Tolerance. The total amount by which a specific dimension is permitted to vary. The tolerance is the difference between the maximum and minimum limits.
They are three types:. The actual size of the feature at any cross section must be within the size boundary. No portion of the feature may be outside a perfect form barrier at maximum material condition MMC. Ans: A theoretically exact point, axis, or plane derived from the true geometric counterpart of a specified datum feature, A datum is the origin from which the location or geometric characteristics of features of a part arc established.
What is Geometric Tolerance? Ans: The general term applied to the category of tolerances used to control form, profile, orientation, location, and runout. What is Feature Control Frame? What is Bilateral Tolerance? Ans: A tolerance in which variation is permitted in both directions from the specified dimension. What is Unilateral Tolerance? Ans: A tolerance in which variation is permitted in one direction from the specified dimension. Want to crack your upcoming job interview?
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Ans: When part features are critical to a function or interchangeability When functional gaging is desirable When datum references are desirable to ensure consistency between design When standard interpretation or tolerance is not already implied When it allows a better choice of machining processes to be made for production of a part Q6.
Ans: Maximum Material Condition MMC : The condition where a size feature contains the maximum amount of material within the stated limits of size. Least Material Condition LMC : The condition where a size feature contains the least amount of material within the stated limits of size. Allowance: Difference between the MMC of two mating parts.
Minimum clearance and maximum interference Basic Dimension: Nominal dimension from which tolerances are derived. Interview Questions Want to crack your upcoming job interview? Recent Topics Archive. Net Interview Question and Answer 1. Top Categories. Enterprise Services. Drop us a line. All Rights Reserved.
Test Your GD&T Knowledge
Geometric Dimensioning and Tolerancing has the following general rules and they are called as Rule No. In short feature should have perfect form at MMC. Rule No. Size Form 2. Individual 3. MMC 5. Zero 6.
Geometric Dimensioning and Tolerancing (GD&T) Interview Questions & Answers