Problem 5. The accompanying illustration shows drawings for a cast-steel valve body before (left) and after (right) machining. Identify the surfaces that are to be machined (noting that not all surfaces are to be machined). What type of machine tool would be suitable to machine this part? What type(s) of machining operations are involved, and what should be the sequence of these operations? 100 mm IT 100 mm Casting After machining