Centre Drilling and Boring

?
View mindmap
  • Centre Drilling + Boring
    • Centre Drilling
      • Lathe is used to drill a hole
        • Into end of rod or bar along its axis
      • Involves the work rotating in the chuck
        • Drill held stationary in the tailstock
      • Process must be carried out with care
      • Smaller hole has to be produced using the centre drill
        • Once used changed for a twist drill
          • Hole produced by centre drill guides twist drill
    • Boring
      • Make large holes
        • Used interanlly to enlarge holes
      • Held in tool post and controlled by hand wheels
      • Can produce flat bottomed hole
    • Both Processes
      • Danger of heat building up beacuse of friction
        • Cutting tool can become blunt and ineffecient
          • Important to keep the work cool
            • Coolant is used
              • Commercial Lathes
                • Pumped onto the work
              • School
                • Applied using a brush
            • Keep end of drill cool
              • Needs to be removed from hole being drilled
                • Keeps tip free of swarf and makes cutting for efficient
    • Tools
      • Right hand knife tool
        • Used to face the left hand edge or cut a shoulder to the left
      • Left hand knife tool
        • Used to face the right hand edge or cut a shoulder to the right
      • Round nose tool
        • Cut in any direction and use radii
      • Parting off tool
        • Moves at right angles into the work to sever material
      • Form Tool
        • Special profiles to cut specific shapes
      • Knurling tool
        • Produce pattern or textured surface on material
    • Speeds
      • Speed of spindle
      • How fast the work will turn
        • RPM (Revolutions Per Minute)
      • Feed
        • Rate at which cutting tool moves along the work as it cuts
      • Formulas enable operator to establish correct speeds and feeds
    • Feed
      • Rate at which cutting tool moves along the work as it cuts
    • Depth of cut
      • How deep cutting tool goes into work
      • Deeper the depth
        • More material will be removed
        • Friction greater
          • Cutting more inefficient

Comments

No comments have yet been made

Similar Design & Technology resources:

See all Design & Technology resources »See all Centre Drilling and Boring resources »