looking to buy a chop saw, HF has two 14" chop saws, one is 2 HP and sells for $69.99. The other is 3.5 HP and sells for $99.99. So for other than more HP, is there any advantage to the more expensive one? I'll only be cutting ¼" or less mild steel
I'll say this: A standard home electrical system is 110-120 volts, at usually 15 amps. Electric power of a motor can be expressed as:
Pw = ηm U I / 1000 where
Pw = power (kW)
ηm = motor efficiency
U = voltage (V)
I = current (A, amps)
So, Pw = [(1)(115volts)(15amps)]/1000 = 1.725kW
Now, 1 watt of electricity = 1/746th of a horsepower, or more easily put 1 HP = 746 watts. So 1.725kW / 746 = 2.31 HP. This is the average maximum horsepower of a standard home system, BUT, this was done at 100% efficiency, which I'd bet a lot of money your HF motor is not (also because 100% efficiency is physically impossible, damn thermodynamics), so the max HP on the bigger saw is still only going to be roughly 2HP unless hooked up to 220v.