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Ex. No : Date :
BORING
Aim
To perform boring on a cylindrical work piece.
Material used
Mild steel rod.
Tools required
- Lathe
- Three-jaw chuck
- Chuck key
- Vernier caliper
- Cutting tools
Procedure
- First loosen the jaw in the chuck key to position the work piece, and then tighten the jaws.
- Fix the cutting tool in the toolpost.
- Switch on the lathe and move the carriage near to the workpiece. Give it a small cross feed, and then move carriage longitudinally to the required length slowly.
- Bring the carriage to the original position, give a small cross feed and move carriage longitudinally. Repeat this step until required diameter is obtained.
- To get smooth surface give a very small feed when the diameter is nearing the required value.
- The drill bit is fixed in the tail stock.
- The hole is made by moving the tailstock through over the bed.
- By rotating the hand wheel which is in the tailstock, the tailstock is move.
- The drill bit is removed .Then the boring bar is fixed in the tailstock. The boring operation is done in the drilled workpiece.
- Finally the dimensions of workpiece are again checked.
Result
Thus the required size and shape of the given work piece is obtained.
Questions
1. What is the difference between drilling and boring?
2. Name the drill material.
3. What are the different drilling machines.
4. Name the different work holding mechanisms in a drilling machine.
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