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Our micro drill bits are great for precision drilling of wood, plastic, and soft metal. This set includes 20 micro drill bits sizes 61-80 and a convenient plastic storage case. These small drill bits can be used with any rotary tool, but they are best used with a push drill or pin vise such as our Mini Push Drill (#402), Push Drill (#403), or Swivel Head Pin Vise(#407).

(Problem): What is the feed per revolution when main axis spindle speed is 500min-1 and cutting length per minute is 120 mm/min? (Answer): Substitute n=500, I=4.72 into the formulae. f=I÷n=4.72÷500=.009IPR The answer is .009IPR.