Aim:

To prepare and assemble a semi-circular fitting joint using mild steel (MS) pieces by performing various fitting operations.

Materials & Tools Required:

• Material: Mild Steel (MS) Flat Pieces (Size: 100 mm × 50 mm × 5 mm)

• Measuring Tools: Steel rule, Vernier caliper, Divider

• Marking Tools: Scriber, Try square, Dot punch

• Cutting Tools: Hacksaw, Chisel

• Filing Tools: Flat file, Half-round file, Round file

• Finishing Tools: Emery paper (if required)

• Holding Tools: Bench vice

• Inspection Tools: Try square

Operations:

1. Measuring and Marking

2. Hack Sawing (Cutting the Metal Piece)

3. Chiseling (Removing Excess Metal)

4. Filing (Smoothing and Shaping the Surface)

5. Assembly and Inspection

Procedure:

1. Clean the MS pieces with cotton waste and emery paper to remove rust, grease, or dirt. Ensure the surface is smooth before proceeding with marking.

2. Use a steel rule to measure and mark the required dimensions. Set a divider to the required semicircle radius and mark the arc on one of the MS pieces. 

3. Use a try square to ensure perpendicularity at the base of the semicircle.

4. Use a dot punch to create small indentations along the marked semicircle for easy cutting.

5. Hold the MS pieces in a bench vice to prevent movement. Use a hacksaw to make rough straight cuts along the curve to remove excess material. Carefully use a chisel to remove smaller sections along the semicircle.

6. Use a half-round file to shape the semicircular edge. If required, use a round file for fine adjustments and smoothness.

7. Place the semicircular cut piece against the corresponding straight piece and check the fit. Use a try square to verify that the semicircle and straight edge align correctly. Re-check the alignment before proceeding.

7. Place both semicircular pieces together to check the accuracy of the V-joint. Ensure that the pieces fit tightly without gaps. Use a try square to check for correct alignment , adjust if needed.

8. In the final process, Use file to smoothen the surface and remove sharp edges. 

Precautions:

1. Use safety gloves and goggles while cutting and filing.

2. Ensure accurate marking before cutting to avoid material wastage.

3. Secure the workpiece firmly in a vice while cutting or filing.

4. Apply uniform pressure while filing to maintain the correct shape.

Result:

A semicircular fitting joint is successfully fabricated using MS pieces, maintaining the required accuracy and alignment.

Development of the Semi-Circular Fit: