Manufacturing And Production Technology
Which among the NC operations given below are continuous path operations?Arc Welding (AW), Drilling (D), Laser Cutting of Sheet Metal (LC), Milling (M), Punching in Sheet Metal (P), Spot Welding (SW)

D, LC, and SW
AW, D, LC and M
D, LC, P and SW
AW, LC and M

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Manufacturing And Production Technology
Which of the following statement is wrong as regard to down milling?

It can not be used on old machines due to backlash between the feed screw of the table and the nut.
The coolant can be poured directly at the cutting zone where the cutting force is maximum.
The surface milled appears to be slightly wavy.
The chips are disposed off easily and do not interfere with the cutting.

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