Question

How the iron blade is fixed into a wooden handle in tools used to dig the soil?

Answer 1

1. First the ring in the iron blade of spade is heated.
2. Heating of the blade leads to its expansion and thus the ring gets bigger.
3. This happens because metals always expand on heating.
4. The metal blade is then fitted easily into the wooden handle.
5. After this, cold water is usually poured on the iron blade which leads to the contraction of the expanded iron blade.
6. The spade can also be left to cool down, undisturbed so that it is firmly fixed, (vu) The blade is attached firmly to the wooden handle of a spade in this process.