[TheForge] Smithing question

[Jerry Frost]

Thanks Dave:

I knew you couldn't believe HP ratings on many motors anymore but AM a bit
surprised HP is HP watt ever it's turned to. <grin>

Torque x RPM I can handle.

Thanks again.

Frosty
------------------------
If it ain't forged
it ain't real.
Wrought iron is.
The FrostWorks

Meadow Lakes, AK.


----- Original Message -----
From: "David E. Smucker" <davesmucker at hotmail.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Saturday, May 15, 2004 2:00 PM
Subject: Re: [TheForge] Smithing question


> Horsepower is horsepower if truly rated.  In other words it is the same
for
> both a gas engine and a 3 phase motor.  Now you can't use any of the damn
> Sears stuff i.e. "peak horsepower" and other associated crap.  (Sears are
> the folks that started this false advertising many years ago when giving
the
> horsepower for various tools.  In most cases it was the stall torque --
> rated as horsepower with the motor burning out.)
>
> The real question is what torque at what RPM are you trying to handle and
> can the motor or the engine provide that torque at that RPM.  So to really
> match a prime mover to a load you need the torque vs. speed curve for both
> the load and the motor or engine.  Hope that helps.
>
> Also some motors are designed to provide very high output torques or
> overloads for short periods of time.  It some case this is 250 % or more
if
> the time is short enough.  A example of this is the electrical motors that
> are used on diesel electric train applications.  They can handle very high
> starting loads to get the train moving -- and then cool back down during
> normal operations.
>
> Dave
>
>