write about the investment casting method.

read the brief carefully and follow the instruction of it .
in the A.a) the two ways i want them to be written are investing casting and CNC milling
in A.c) write about the investment casting method
in A.d) in this section about the costing, I want to have an accurately estimated price for one process to be done e.g.. how much it cost to make the foot valve using the CNC milling
Finally i want everything to be clear with a good referencing and please make sure that i want no plagiarism in the assignment
1-PAGE SUMMARY NEEDED;