Question

What is the typical machining allowance for aluminum?

(a) 0.5 mm

(b) 1.6 mm

(c) 2.4 mm

(d) 3.0 mm

I had been asked this question by my school teacher while I was bunking the class.

I want to ask this question from Pattern Making topic in chapter Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

Answer 1

Correct option is (b) 1.6 mm

To explain I would say: The extra size given to a matter for machining purpose is called machining or finishing allowance. For aluminum of 0-300 mm, an allowance of 1.6 mm is permitted. For aluminum of 0-600 mm, the typical machining allowance is 3.2 mm.