Reply by bigblockyeti

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Posted on Is there an advantage to worm-drive circular saw?

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5285 posts in 1921 days

#1 posted 01-23-2014 02:02 PM

You can change the oil in a worm drive saw, if done every couple years can extend the life of the gearbox for a very long time. Grease lubricated parallel gears in over 99% of sidewinder saws are more efficient from a mechanical design standpoint and because the gears aren’t dragging through a heavy oil. They rely on a (very) thin film of oil from the grease. Over 99% of side winder saws have the drive pinion teeth cut into the armature shaft which has to be replaced when the gears become worn. Worm drive saws have a worm that is installed onto the armature shaft, in the unlikely event it requires replacement, the armature doesn’t have to be purchased as well. The worm gear (on the blade spindle) is brass which lends itself well to the sliding action of such a gear train. From a power standpoint the average horsepower supplied by a good worm drive saw will be close to that of a good sidewinder saw, the taller gear ratio in the worm drive saw offers more torque, which in many cases can be seen as an advantage over greater blade speed.

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