Concept explainers
(a)
The high-speed steel 6.0-mm twist drill is used in a production drilling operation on mild steel. Cutting oil is apply by the operator by brushing the lubricant over the drill point and flutes before each hole. The cutting conditions are speed = 25 m/min, feed = 0.10 mm/rev, and hole depth = 42 mm. The foreman comments that the “speed and feed are right out of the handbook” for this work material. Yet, he also says, “The chips are clogging in the flutes, resulting in friction heat, and the drill bit is failing in advance due to overheating.” Analyze the problem.
(b)
The high-speed steel 6.0-mm twist drill is used in a production drilling operation on mild steel. Cutting oil is apply by the operator by brushing the lubricant over the drill point and flutes before each hole. The cutting conditions are speed = 25 m/min, feed = 0.10 mm/rev, and hole depth = 42 mm. The foreman comments that the “speed and feed are right out of the handbook” for this work material. Yet, he also says, “The chips are clogging in the flutes, resulting in friction heat, and the drill bit is failing in advance due to overheating.” recommend some changes that might be made to solve it.
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