MAE 1351 Exam 4 Questions And Answers( Update)

What is the accepted national standard in the United States for dimensioning and tolerancing? - ANSWER-ANSI Y14.5 Dimension - ANSWER-*A numerical value expressed in appropriate units of measure and used to define the size, location, geometric characteristic, or surface texture of a part or part feature. Arrowhead - ANSWER-A small triangle at the end of dimension lines and leaders to indicate the direction and extent of a dimension (see Figure 15.10). Dimension Line - ANSWER-A thin, dark, solid line that terminates at each end with arrow- heads. The value of a dimension typically is shown in the center of the dimension line. *A dimension line, along with its arrowheads, shows the direction and extent of a dimension (see Figure 15.10). Extension Line - ANSWER-A thin, dark, solid line extending from a point on an object, perpendicular to a dimension line. *Extension lines are used to indicate the extension of a surface or point to a location preferably outside the part outline (see Figure 15.10). There should be a visible gap between extension lines and visible lines so the person reading the drawing can distinguish between the part and the dimensions describing the part. Leader - ANSWER-A thin, dark, solid line terminating with an arrowhead at one end and a dimension, note, or symbol at the other end. *Leaders are used to direct a dimen- sion, note, or symbol to the intended place on a drawing. contour rule or contour dimensioning - ANSWER--In addition, each dimension should be placed in the view where the contour shape is best shown. This is known as the contour rule or contour dimensioning. Baseline Dimensioning - ANSWER-All of the dimen- sions in a given direction originate from a base or datum. Chain Dimensioning - ANSWER-Features are dimensioned relative to another. M