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Because of their tendency to stick to the blade.
A coarse blade cuts faster. This is futile with very hard metals - they will merely dull a coarse tooth blade - but is simply quicker with softer metals. Hard metals cut best, though slowly, with a fine tooth blade.
A blade with those teeth is for cutting very hard metals.A blade with those teeth is for cutting very hard metal
The hacksaw is a saw for cutting metals. It has a very fine tooth, replaceable blade.
A hacksaw is a metal frame that holds an adjustable and disposable blade for cutting metals. Blades are usually 12" long and 1/2 wide with a range of teeth for cutting different metals.
A hack saw is for cutting metals. It has a disposable blade and you can choose from many tooth sizes and teeth per inch, this allows cutting of a wide range of metals, soft to very hard.
It is used when you need a maneuverable saw as in an arch in a stand or bench.
On a blade, the cutting edge is the sharp side.
Shearing requires one blade to pass over another blade or a fixed edge. Cutting only requires one blade.
On a circular saw, a combo blade is one that can be used for both ripping and cross-cutting wood. Ripping is done by cutting with the grain of the wood.Cross cutting refers to cutting across the grain.
the wood blade has sharp long teeth and the metal on has small tiny teeth
The cutting blade on a sawmill is typically powered by an electric motor or a gasoline/diesel engine. These power sources provide the necessary energy to drive the blade through the wood to perform the cutting operation.