Blueprint Reading 3

Click the card to flip 👆
1 / 43
Terms in this set (43)
AllowanceThe tightest possible fit between two mating parts.How do you calculate the tightest fit?Allowance(MMC) = hole(min) - shaft(max)Force fitAlso called Interference, where the shaft is larger than the hole.When tolerancing a Force fit, How do you find the Min/Max Interference?Min(LMC) = shaft(min) - hole(max), Max(MMC) = shaft(max) - hole(min)ClearanceThe maximum difference between the two mating dimensionsHow do you calculate the loosest fit?Clearance(LMC) = hole(max) - shaft(min)Baseline dimensioningAlso called datum dimen, technique where dimensions are referenced from a common pointChain dimensioningA technique where each dimension is referenced from the previous leader line.What problem does Chain dimensioning create that Baseline dimensioning doesn't?It creates an error of tolerance buildupTolerance buildupWhere the overall dimension will have a tolerance that is actually the sum of all the tolerances of each dimension.What is the advantage to manufacturing with Baseline dimensioned drawings?Tighter tolerances for all dimensionsFeaturePhysical portion of a partWhat are 3 examples of features?Surface, Holes, and Pins on an electrical connectorFeature of sizeAny feature that has a dimension associated with itWhat are 5 examples of Feature of size?Length, Width, Height, Diameter, DepthStraightnessThe amount a feature can vary from a straight line.GD&TA tolerance method that applies tolerances to geometric features and features of size.What are 5 types of Geometric Features?Form, Profile, Orientation, Location, Run-outFormMeasurement of a plane or circular surface of a part (ie. Straightness/Flatness)ProfileDescribes the form and orientation of the outline of the partOrientationDescribes how two features are positioned with respect to each other (ie. Parallelism, perpendicularity)LocationWhere a feature is positioned to a reference point or another featureRun-outMeasurements taken on points of a shaft to find errors in straightness, cylindricityWhat does GD&T use to represent the tolerance of features?SymbolsDatuma theoretical perfect line, point, or plane that is located by a datum featureWhy is a datum needed?To ensure the tolerances for dimensions on a part don't produce different readings depending where the measurement was takenWhat are datum features key function?It provides a perfect feature to base quality inspection and measurement off ofWhat is used to identify a datum feature on a part drawing?A datum reference, a capital letter with a box around itWhat are the 2 ways Datum features are identified?A leader line with a triangle attached or with an arrowhead attachedFeature control frameis used to relate a geometric tolerance to a part feature.What are the 4 reasons GD&T are important to manufacturing?Consistent Lingo, Increased tolerances, How to measure and manufacture parts, Describes the features of a partThe tolerance for a geometric feature can be easily identified by reading the _________?Feature control frameWhat are 3 features that a feature control frame describes?Surfaces, Features of size, Features w/o a size