Question 3
a) In an Electrochemical Machining process, the feedstock ismade of an aluminium alloy (Ultimate Tensile Strength = 572 MPa,Tensile Yield Strength = 503 MPa). The desired time to machine ahole (?=10 mm) through a 20 mm-thick part is 2.1 min at a feed rateof 0.18 mm/s. What are:
(i) the efficiency of the process in %, and
(ii) the current requirement in amps to achieve this machiningtime target?
b) Describe in detail the process of circular sawing with theaid of a freehand sketch. What are the two major mechanisms bywhich circular sawing is achieved and what materials are commonlyused as circular saws of each type?
