Why do circular saws cut upwards?

Online Answer
The teeth of circular saw blades are intended to cut upwards into the material from below and this is for safety purposes. It is important that you should not spin them in a different direction just like you spin a table saw blade..
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The hook angle is the amount of forward or backward lean each tooth has. ... To prevent self-feeding, sliding miter saws and radial-arm saws require a blade with a negative tooth angle. In general, a blade with a positive hook angle is a faster-feeding blade and one with a negative hook is less aggressive..
The teeth of circular saw blades are intended to cut upwards into the material from below and this is for safety purposes. It is important that you should not spin them in a different direction just like you spin a table saw blade..
The first tool that comes to mind for cutting curves is a jigsaw, but if the curve is gradual, try a circular saw instead. It's surprisingly quick and easy to cut a smooth curve with a circular saw. This method is for cutting rough curves. ... The thinner the material you're cutting, the sharper the curve can be..