Question

Which of the following formula is true for the angle of internal dovetail?

(a) Tan A = (l2-l1/2) / h

(b) Sin A/2 = (l2-l1/2) / h

(c) Cos A = (l2-l1/2) / h

(d) Sin A = (l2-l1/2) / h

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This is a very interesting question from Determine the Included Angle of an Internal Dovetail in section Miscellaneous Measurements (EM) of Engineering Metrology

Answer 1

Correct option is (a) Tan A = (l2-l1/2) / h

The explanation: Formula for finding the angle of an internal dovetail is Tan A = (l2-l1/2) / h where l1 and l2 are the distance across the pins and h is the height of slip gauges. Thus by knowing these three parameters, angle A can be calculated.