Reply by richgreer

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Posted on Motor differences between Circular saws(120v/2.3hp) vs Table saw (120/1.5hp)?

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4541 posts in 3072 days

#1 posted 11-04-2011 02:27 PM

In my opinion, there is a problem with how horsepower is measured and reported for hand held tools.

In general, horsepower ratings are based on the amperage draw. With hand held tools they measure the draw when there is a surge in the amperage in the micro second before the circuit breaker pops. They are not measuring the amount of power that is being provided on a sustainable basis.

I don’t like it, but it does seem to be done on a consistent basis. I note that routers are often labelled as 1.75 hp, 2.25 hp or 3.25 hp and you can usually expect that all routers of a given hp rating have about the same power.

With stationary tools, they provide a more honest measurement of horsepower.

A comparison of the rating on a hand held tool and a stationary tool is not very meaningful.

Also note that most stationary tools have induction motors and most hand held motors have universal motors and these 2 types of motors have different characteristics. You can expect an induction motor to run quieter, last longer, be heavier and have a little less power at start up.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

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