Watts=volts x amps. 1HP =746Watts. Double the voltage then half the amps. It
is 240 volts and 120volts in residential. 110volts and 220 volts went the
way of the Doh-doh bird long ago. Using old numbers with newer equipment
will do funny things to your mathematical calculations compared to real
world measurements.

Stu

"Leon" wrote in message
...

wrote in message
...
My new edge sander was delivered today, Grizzly 6x80. In the version
of the manual on the website they list it as 1.5 HP 16A/8A. But in
the manual that came with it and on the nameplate on the motor it says
1.5 HP 20A/10A.

Now I should probably run a dedicated 220V line to it regardless, but
for the time being I thought I was going to be fine on my 20A 110V
circuit. I just think it's very weird because if it's really drawing
20A then why are they calling it 1.5 HP? 20A should give 2 HP. I was
under the impression that they couldn't lie about the amps, but HP
ratings were more fudge-able. It's a 1725 RPM motor, and looking at
the motors Grizzly has in their catalog the 1.5 HP 1725RPM model draws
17A, whereas the 3450RPM draws 15.6. So I suppose that can explain a
bit of why the number is higher than I expect, but not all of it.
Have they just found a new source of really inefficient motors?

I wired it for 110 and it ran fine with no belt on it, but that
doesn't really mean anything. I need to build a stand for it and get
it up on that before I start bolting on all the tables and whatnot so
it's going to be a while before I can test it under load.


Before adding special circuits I would first plug it in to what you have
and try it out during actual use.

On a 15 amp circuit I run a radio, lighting, 12 amp dust collector and a
15 amp router, no problem at all unless the compressor comes on.
typically your heaviest amp draw is going to be when you start the
machine, usually you don't work on the machine until it comes up to speed
and the amp demand goes down.