Centre Drilling and Boring
- Created by: KittyKatKatiexx
- Created on: 13-03-17 16:55
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- 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
- Once used changed for a twist drill
- Lathe is used to drill a hole
- Boring
- Make large holes
- Used interanlly to enlarge holes
- Held in tool post and controlled by hand wheels
- Can produce flat bottomed hole
- Make large holes
- 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
- Commercial Lathes
- Keep end of drill cool
- Needs to be removed from hole being drilled
- Keeps tip free of swarf and makes cutting for efficient
- Needs to be removed from hole being drilled
- Coolant is used
- Important to keep the work cool
- Cutting tool can become blunt and ineffecient
- Danger of heat building up beacuse of friction
- 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
- Right hand knife tool
- 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
- Centre Drilling
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