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Electric Drill. According to the shop manual, when
Chapter 11, Problem 27E(choose chapter or problem)
Electric Drill.? According to the shop manual, when drilling a 12.7-mm-diameter hole in wood, plastic, or aluminum, a drill should have a speed of 1250 rev/min. For a 12.7-mm-diameter drill bit turning at a constant 1250 rev/min, find (a) the maximum linear speed of any part of the bit and (b) the maximum radial acceleration of any part of the bit.
Questions & Answers
QUESTION:
Electric Drill.? According to the shop manual, when drilling a 12.7-mm-diameter hole in wood, plastic, or aluminum, a drill should have a speed of 1250 rev/min. For a 12.7-mm-diameter drill bit turning at a constant 1250 rev/min, find (a) the maximum linear speed of any part of the bit and (b) the maximum radial acceleration of any part of the bit.
ANSWER:Solution 27E Problem (a) Step 1: Diameter of the hole d = 12.7 mm -3 Radius r = 6.35mm or 6.35 x 10 m Angular speed of the drill = 1250 rev/min 20.83 rev/s