explain how the iron blade of a spade is fixed to a wooden handle
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The hole in an blade must be made to be smaller than the wood.
This is accomplished in three different ways.
The old blacksmith's way is to heat the blade so that the hole is large enough to go over the wood and when it is cooled it will shrink down to the size of the wood. Wagon wheels are made this way.
Secondly, the wood is put into the hole of the blade and then spread out with wedges that expand the wood. Hammers are often made this way.
Thirdly, in a pick axe the blade is dropped onto the the handle from the hand end and the working end is over-sized so that it will not slip off.
This is accomplished in three different ways.
The old blacksmith's way is to heat the blade so that the hole is large enough to go over the wood and when it is cooled it will shrink down to the size of the wood. Wagon wheels are made this way.
Secondly, the wood is put into the hole of the blade and then spread out with wedges that expand the wood. Hammers are often made this way.
Thirdly, in a pick axe the blade is dropped onto the the handle from the hand end and the working end is over-sized so that it will not slip off.
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Answer:
By contraction and expansion
Explanation:
The iron blade of a spade is fixed to a wooden handle by heating up the iron blade, thus, making it hole expand. now, we can fit the handle into the hole. then, we pour some cold water on the iron blade and it thus contracts now it is perfectly fitted into the wooden handle
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