007 drilling


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007 drilling

  1. 1. Drill and Drilling Processes
  2. 2. Drill Press Motor Drill head clamp Slotted table Column T-slotted base Chuck Feed handle Pulley guard Start-stop switch Release/lock for vertical adjustment of the table
  3. 3. Work-Holding Attachments and Accessories <ul><li>Drill Vise </li></ul><ul><li>A work-holding tool in which the work piece may be seated square and securely while drilling is performed. </li></ul>
  4. 4. Work-Holding Attachments and Accessories <ul><li>Common accessories used for clamping work: </li></ul>
  5. 5. Work-Holding Attachments and Accessories
  6. 6. Holding a Work <ul><li>Accessories for clamping work are important to keep the work piece parallel while being supported above the worktable or vise surface and to keep the drill from cutting into the holding device or worktable. </li></ul>
  7. 7. Laying Out Work <ul><li>Laying out work for drilling consists of locating and marking the exact centers of the holes to be drilled. The accuracy of the finished work piece depends, in most part, on the accuracy of the layout. </li></ul>
  8. 8. Drilling Operation <ul><li>Drilling is the operation of producing a hole in solid material by means of cutting tool called a drill . </li></ul>
  9. 9. Drilling Operation
  10. 10. Safety Precautions <ul><li>Do not support the work pieces by hand. </li></ul><ul><li>Never make any adjustments while the machine is operating. </li></ul><ul><li>Never clean away chips with your hand. Use a brush. </li></ul><ul><li>Keep all loose clothing away from turning tools. </li></ul><ul><li>Make sure that the cutting tools are running straight before starting the operation. </li></ul><ul><li>Never place tools or equipment on the drilling tables.   </li></ul><ul><li>Keep all guards in place while operating. </li></ul><ul><li>Ease up on the feed as the drill breaks through the work to avoid damaged tools or work pieces. </li></ul><ul><li>Remove all chuck keys and wrenches before operating. </li></ul><ul><li>Always wear eye protection while operating any drilling machines. </li></ul>
  11. 11. Drill Press Work Area Detail
  12. 12. Drilling Operations <ul><li>Drilling machines may be used to perform other operations. They can perform countersinking, boring, counter boring, spot facing, reaming, and tapping. </li></ul>
  13. 13. Drilling Operations
  14. 14. Drills <ul><li>The principal parts of standard twist drill </li></ul>Body Length
  15. 15. Rake Angle <ul><li>The angle between the flute and the axis of the drill that forms the cutting edge is known as the rake angle. Generally, the rake angle is between 18° and 45°, with 30° being the most common. </li></ul>
  16. 16. Specialty Drills
  17. 17. Specialty Drill <ul><li>Coolant fed twist drills </li></ul>Standard step drills
  18. 18. Drill Shanks <ul><li>Straight shank drills are used on most portable drilling machines – for example, the electric drill. </li></ul><ul><li>Tapered shank drills can quickly and accurately inserted to the spindle of a machine without using screw or clamps. </li></ul>
  19. 19. Drill Holding Devices <ul><li>Geared Drill Chuck </li></ul><ul><li>Drills with straight shanks are held in geared drill chucks which have three adjustable jaws to clamp onto the drill. </li></ul><ul><li>Drill Sleeve and Socket </li></ul><ul><li>A drill too small for the machine spindle may be fitted into a socket or sleeve which has a taper hole of the proper size to hold the drill and a taper shank of the proper size to fit the drill spindle. </li></ul>
  20. 20. Drill Holding Devices Geared Drill Chuck Chuck Sleeve
  21. 21. Drill Drift <ul><li>Drill drifts are flat, tapered keys with one rounded edge that are designed to fit into a spindle chuck's slot to force a tapered shank drill loose. </li></ul>
  22. 22. Checking the Depth of Drilled Holes <ul><li>Do not measure from the bottom point of the hole. A thin depth gage is inserted into the hole, along the side, and the measurement taken. </li></ul><ul><li>Clean all chips and coolant from the holes before attempting any depth measurement. </li></ul>