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Chapter24ba - Materials Processes in Manufacturing ME 151...

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©2003 Bill Young 1 Materials & Processes in Manufacturing ME 151 Chapter 24 Drilling and Related Hole Making Processes ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bill Young 2 Introduction Drilling is the most common method of producing a hole Drilling makes up 25% of all machining operations _________________ with several inherent problems: Cutting edges at the end of a relatively flexible tool Cutting action takes place inside the workpiece Exit for the chips is limited by the tool Friction produces additional heat Lubrication & cooling difficult due to chip flow Drill accuracy and precision depend on: Drill point ___________ and ____________ (Angles, Edge) Drilling machine tool (Drill Press, Lathe, Machining Center) Workholding device (Vise, Fixture) Drill holder (Chuck, Adapters, Spindle) Surface of the workpiece (Hard Spots, Sand Pockets, Mill Scale) ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bill Young 3 Types of Drills Types of Drills ________ Drills (Fig 24-3 Page 587) Gun Drills (Deep Hole Drills) (Fig 24-7 Page 592) Combination Drills (Fig 24-10 Page 594) Spade Drills (Fig 24-11 Page 594)
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  • Spring '08
  • AlanT.Male
  • Bill Young, ___________________________________ ___________________________________, Drills Insert Drills

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