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Which of the following is not correct for dovetail joints?

(a) Sloping sides act as a guide

(b) The slope is 1:5 for softwoods

(c) Used in box constructions

(d) Difficult to make manually

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

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Correct answer is (b) The slope is 1:5 for softwoods

For explanation I would say: In dovetail joint, the sloping sides acts as guide and during the mating operation prevent the lifting of the female mating part. The slope is 1:6 for softwoods and 1:8 for hardwoods.

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