Question

9. Which of the following reasons necessitate(s) rough machining before finish Machining? a) b) c) d) When the material removal amount exceeds the horsepower of the machine When the material removal amount exceeds the designed safe cutting limit of the tool or machine To assure that a minimum amount of material is machined in order to maintain a required tolerance throughout a production run To assure that a minimum amount of material is machined in order to maintain a required surface finish throughout a production run e) All of them 10. CNC machines can generally position to an accuracy of ±0.002 inch ±0。002 inch ±0.0001 inch ±0.001 inch None of them a) c) d) e) 11. Which of the following processes need(s) interpolation technique? A Drilling two holes B. Milling a straight line from point a to point b C. Boring two holes D. Tapping two thread holes E. None of the above 12. If a servo system does not have sensing or feedback system to verify and monitor the machine's actual positioning, it is called: a) Point-to-Point movement system b) Continuous path movement system c) Open-Loop system d) Closed-Loop system e) None of them The origin and machining order is shown in the part drawing. If the part is programmed in absolute mode, the coordinate of hole 2 is: 13. A. x 5.25, y 6.031 B. x=8.75, y = 8.031 C. x=8.031, y = 325 D. x=4.031 , y=6.031 E. None of above

Answer 1

You did not mentioned which one to answer so I am obliged to answer 9th.

It's answer is e) - all of them.

because -b) and c) Machining is costly so we want to remove excess material in safe zone as roughly and cheaply as possible.

a) and d) because MRR is for whole removal part so we can reduce the material and hence operate in safe zone and within given horsepower.

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