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(i)  What is the difference between counter boring and counter-sinking?

(ii)   What are the basic differences between gear milling and gear bobbing?

(iii)  What are the basic differences between facing at constant S-speed and facing at constant feed?

(iv)  A surface 80mm x 160mm is rough machined using a face milling cutter of 150 mm diameter having 10 teeth. The cutter centre is off-set by 15 mm from the line of symmetry of the surface. Estimate the time to rough machine the surface, if the feed per tooth is 0.25 mm and a cutting speed of 20 m/min is employed.

(v)   With 5 mm approach and 5 mm over-nm v hat is the single pass feed time?

(vi)  If tool axis is symmetrical with the job what happens to the machining time ?

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