Experiment No.: 03
Aim of the experiment:
To make a bicycle shaft.
Material Required:
A steel cylindrical rod of length 146 mm.
Diagram:
Tools and Equipment:
- Lathe machine
- Single point cutting tool
- Grinding machine
- Bench vice
- Flat file
- Hacksaw
- Outside caliper
- Steel rule
Procedure:
- Firstly, the workpiece is put on the lathe, fitted in the headstock using a chuck with a chuck key or chuck wrench.
- A hole is drilled after the right end is faced to fit into the tailstock.
- Turning is done to obtain 22 mm of cross-sectional area of the workpiece.
- Marks are made on the workpiece with chalk to indicate the regions of turning.
- The turning is done in regions starting from one end, and a 5 mm section is left between each turned region. The first 55 mm is turned, then a 5 mm gap is left, followed by another 55 mm turning, then another 5 mm gap, and finally, 36 mm is turned.
- The workpiece is turned until the cross-sectional area of the three sections becomes 16 mm.
- Using a flat file, the workpiece is made smoother.
- Using a file, slight grooves are made near both ends.
- The workpiece is taken out of the lathe, and the extra foot is cut off with a hacksaw.
- It is then ground on a grinding machine to get deeper and smoother grooves.
Precautions:
- Make sure the entanglement hazards are removed (e.g., loose clothing, jewelry, etc.).
- Keep the floor free from obstructions or slip hazards.
- Cutting tools should be sharp.
- Stop the lathe before taking measurements of any kind.
- The start/stop button should be within easy reach of the operator.
- The workpiece should be held tightly in the bench vice.
Conclusion: –
To be written by student.