"effinperfectionist" wrote in message . com...
This is hilarious.

4.4HP * 746W = 3282.4W

3282.4W / 15A = 218.83V


You are playing the same game bu using "theoretical" numbers. You have to look at efficiency and power factor to knoe the actual
watts/hp

If your 110/115/120V (however you want to rate it) circuit EVER reaches
that, you're going to melt stuff in your house.
Vpeak for 110Vrms is only about 155V. I've measured 125Vrms in the wall
before, which is a peak of 177V.


peak-to-opeak voltave has nothing to do with it.

In short, it is IMPOSSIBLE for that saw to ever develop 4.4HP, presuming its
stall current is 15A, and it is running on a household 110V circuit (and
further presuming that the motor is operating at 100% efficiency, which it
is, of course, NOT).


the 15A is full load current (FLA) not locked rotor current.

Now, if it can draw 21A at Vpeak (155V) without turning in to a puddle, then
it can consume power equivalent to 4.4HP, though it still wouldn't be
cutting wood at that rating.



Still wrong since you are not taking efficiency and power factor in to account and you are using a ficticious voltage.

The long and short of it is that on a nominal 120vac circuit, a motor drawing 15 amps will produce `~1.5 hp. On a 20 Amp curcuir
you can eek out a little more at the expense of heat and speed. If the circuit is not limited, it will continue to slow down and
produce more power until it hist 'breakdown' and stalls. at that point it will deaw the Locked rotor current.

I am not sure why the manufacturers have taken to this silly rating game. I have a 1.5 hp Ingersol-Rand air compressor that is 1.5
HP and draws about 16 amps. The same compressor by today's 'standard' is rated at 6hp. That's great, except that in reality, they
do the same amount of work for the same power input.






"Wayne Brissette" wrote in message
thlink.net...
A co-worker asked my opinion of the current worksite table saws out there.
He
mentioned that he had seen the Bosch 4000 at Cosco along with the Dewalt
744.
He said he was leaning towards the Bosch 4000 because it had a 4HP motor.
"What? No, way!" I told him, then he proceeded to show me Bosch's web site
where in fact they claim:

* Powerful 15 Amp, 4.4 HP max. tool output - Power to tackle any material

OK, how are they claiming to get 4.4 HP out of this thing on 115v?


Wayne