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DRILLS AND DRILLING PROCESSES

DRILLS AND DRILLING PROCESSES. DRILLS AND DRILLING PROCESSES. Introduction Types of Drill presses Portable Drilling Machine Sensitive Drilling Machine Upright Drilling Machine – Round column section or pillar and Box column section Heavy duty Drilling Machine. DRILLS AND DRILLING PROCESSES.

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DRILLS AND DRILLING PROCESSES

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  1. DRILLS AND DRILLING PROCESSES

  2. DRILLS AND DRILLING PROCESSES • Introduction • Types of Drill presses • Portable Drilling Machine • Sensitive Drilling Machine • Upright Drilling Machine – Round column section or pillar and Box column section • Heavy duty Drilling Machine

  3. DRILLS AND DRILLING PROCESSES • Radial Drilling Machine • Gang Drilling Machine • Multiple – drill head Drilling Machine • Tape Controlled Drilling Machine

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  5. DRILLS AND DRILLING PROCESSES • Work Holding Attachments and Accessories • Drill – press vice • Drill jigs • Angle plates • V – blocks • T – bolts, Clamps and step blocks

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  15. DRILLS AND DRILLING PROCESSES • Cutting Tool • Flat or Spade drill • Straight fluted drill • Twist drill • Parallel shank – short series • Parallel shank – stub series • Parallel shank – long series • Taper shank • Taper shank core drill • Oil tube drill

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  25. DRILLS AND DRILLING PROCESSES • Geometry of drill bits • Axis – Body – Chisel edge – Face – Flank – Flutes – Heel – Lands – Lip – Neck – Shank – Tang • Chisel edge angle – 120 to 135 • Helix angle or rake angle – 30 • Point angle – 118 • Lip clearance angle – 12

  26. DRILLS AND DRILLING PROCESSES • Grinding of drill bits • Operations • Drilling • Reaming • Countersinking • Counterboring • Lapping

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  30. DRILLS AND DRILLING PROCESSES • Cutting Speed • v = (π D N)/ 1,000 mpm • D – diameter of drill in mm • N – rpm of the drill spindle

  31. DRILLS AND DRILLING PROCESSES • Safety • Work should not be held by hand • Hair cut short, wear a cap, short sleeves, no neck ties, no rings or a wrist watch • Dull drill can cause an accident

  32. DRILLS AND DRILLING PROCESSES • Use correct tool to release a taper shank drill from drilling m/c – drill drift • Stop the m/c before measuring or adjusting • Stop m/c before removing chips and excess coolant

  33. QUESTIONS? THANK YOU!

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