Objective: – To design chopper for composter.

Material: – Power cutter, GI pipe, iron sheet, welding machine, paint and grinder.

Procedure: –          

DESIGN OF CHOPPER

1. Firstly the GI pipe of 25 mm diameter was taken of length 130.5 cm and cut it as per dimension with power cutter.

2. For blades of the chopper the iron sheet of 2 mm thick was taken and cut it with dimension 22 cm x 11 cm by using cutter grinder

3. Then one blade having spike teeth of 2 cm length and 1.5 cm of height were cut with help of cutter grinder.

Finishing of blades

4. The blades were grinded with grinder.

5. Then the both blades edges were sharpened on bench grinder.

Blades

6. The grooves of 5 cm were made on the pipe as well as on blades for fixing the blades into the pipe. The grooves were made with help of cutter grinder.

7. After the blades are fitted into each other and in pipe grooves.

8. Then the blades and pipe was welded with welding machine.

Welding

9. The fabricated chopper was then painted with primer and the next day with color.

Painting of chopper

Bill of Material: –

Sr. No. Material Price (Rs)
1.   GI pipe 48
2.  MS sheet 50
3.   Welding 100
4.   Grinder 25
5.   Cut off 20
6.   Paint and Red oxide 100
Total Rs. 343

Learning Outcome: –

  1. Cutting by power cutter and cutter grinder
  2. Polishing by grinder
  3. Bench grinder
  4. Arc welding