Using a torque force, these clever cutting tools make light work of wood.
Circular saws rely on providing a large ‘torque’ in the centre of a hole in the blade.
As a force is applied to one side of the hole, a torque force is created much like when using a spanner on a nut, although signifi cantly faster. When cutting through an object such as wood, the circular saw is placed fl at with the saw pointing down. The wood is clamped in place. By slowly moving the blade through the wood it will produce a clean cut.
There are several types of circular saw, most spinning at up to 3,500 rotations per minute (rpm) to make a clean cut through an object. Some connect the motor directly to the saw for a one-to-one speed ratio. Others use a combination of large and small cogs to alter the revolution of the saw and ultimately the speed.
For example, by attaching a large gear cog to a smaller one on the blade, usually at a ratio of two to one, a motor turning at 1,750 rpm will actually move the blade at 3,500 rpm.
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