HW 2
A triangular shape can be dimensioned by giving one of the triangle's internal angles and one of the triangle's external angles, since providing two of the angles of a triangle fixes the triangle. T/F
False
Extension lines can be crossed by dimension lines. T/F
False
Finish symbols are applied to indicate that two parts must be welded together. T/F
False
Superfluous dimensions are required because they facilitate reading the size of a feature in a set of orthographic multiview projections. T/F
False
The diameter of a circular feature should be indicated by placing the symbol "&" in front of the diameter dimension. T/F
False
When specifying standard threads on drawings, the inch system calls for the distance between adjacent threads, and the metric system calls for the number of threads in a given length. T/F
False
A cylindrical shape can be dimensioned by providing its height and the diameter of its base. T/F
True
A fit between a shaft and a ball bearing case produces, between the shaft outer diameter and the bearing inner diameter, a maximum clearance of 0.1 mm and a minimum clearance of -0.1 mm. This fit is a transition fit. T/F
True
A leader line is a thin solid line directing attention to a note or dimension. T/F
True
Dimension lines cannot be crossed by any other line. T/F
True
Dimensions should be given on the side of a view that is adjacent to another view. T/F
True
Dimensions should be given on visible features and not on invisible (hidden) features. T/F
True
The radius of a curved feature should be indicated by placing the letter "R" in front of the radius dimension. T/F
True
A fit that is associated with negative maximum clearance and negative minimum clearance a. Interference fit. b. Transition fit. c. Clearance fit. d. None of the above.
a
Using tables to be found online (as suggested in the lectures/exercises), design an interference fit between a pin and a hole. The pin/hole nominal diameter will be 50 mm, and the fit will be class "Hole H7/Pin p6". Calculate the pin minimum diameter and the hole maximum diameter associated with your design. Mark below the selection that best matches your design. a. Pin minimum diameter = 50.026 mm. Hole maximum diameter = 50.025 mm. b. The given fit class (Hole H7/Pin p6) is not even an interference fit, so the problem, as posed, has no solution. c. The is no sufficient information to answer d. Pin minimum diameter = 50.025 mm. Hole maximum diameter = 50.026 mm.
a
The primary datum should be: a. The feature with the largest surface area. b. The feature with a concave shape c. The feature with the tightest tolerance. d. The feature with a convex shape.
a & b
Secondary datums usually have: a. Tolerances that are one time the tolerance associated with the primary feature. b. Tolerances that are three times the tolerance associated with the primary feature. c.The largest possible surface area. d. None of the above.
b
