Cutting speed: Cutting speed is the rate of expressed in feet per minute. That a point on the drill travels in one minutes. Its mathematically expressed as.. Rpm= Cutting speed ( sfpm )/ Sfpm means surface feed per minute. What factors affect the cutting speed for drilling? The cutting speed for drills depend upon i. The kind of material being drilled where speed is high in soft material. ii. The cutting tool material where speed is high in hard material. iii. The quantity of hole design. iv. The efficiency use of cutting fluid. v. The way in which the work is set up of held. vi. The size and the type of drilling machine. If drill machine is older cutting speed is lower. If drill machine is newer cutting speed is newer. Feed: Feed is the distance
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