What will be the machining allowance for a bore of a 405mm cast iron object to be casted?(a) 1.0mm(b) 2.0mm(c) 3.0mm(d) 5.0mmI had been asked this question in semester exam.I would like to ask this question from Difference between Pattern and Casting topic in portion Pattern and Pattern Making of Casting-Forming-Welding I

What will be the machining allowance for a bore of a 405mm cast iron o

1.	What will be the machining allowance for a bore of a 405mm cast iron object to be casted?(a) 1.0mm(b) 2.0mm(c) 3.0mm(d) 5.0mmI had been asked this question in semester exam.I would like to ask this question from Difference between Pattern and Casting topic in portion Pattern and Pattern Making of Casting-Forming-Welding I
Answer» Correct ANSWER is (d) 5.0mm For explanation I would say: The machining ALLOWANCE for CAST IRON of various dimensions is SHOWN in the table below. DIMENSIONS(mm) ALLOWANCE(mm) BORE SURFACE COPE SIDE upto 300 3.0 3.0 5.5 301-500 5.0 4.0 6.0 501-900 6.0 5.0 6.0

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