Question

Find out the error(s) in the following design of a casting.

(a) The vertical faces must be tapered ( provide draft allowance) only

(b) The cavity must be created using some additional elements ( loose piece) only

(c) The vertical faces must be tapered as well as the cavity must be created using loose piece

(d) Nothing needs to be done ( no error)

This question was addressed to me in class test.

Question is taken from Pattern Design in portion Pattern and Pattern Making of Casting-Forming-Welding I

Answer 1

The correct choice is (c) The vertical faces must be tapered as well as the cavity must be created using loose piece

For explanation: Draft allowances well as loose piece needs to be provided to the pattern in order to maintain the quality of the casting. The corrected design is drawn below