[TheForge] Smithing question

[David E. Smucker]

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


----- Original Message ----- 
From: "Jerry Frost" <frosty at customcpu.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Saturday, May 15, 2004 12:49 PM
Subject: [TheForge] Smithing question


> I know this has been covered in the past but don't recall the answer(s).
>
> How does gas engine HP equate to 3ph. electric motor HP?
>
> Thanks,
>
> Frosty
> ------------------------
> If it ain't forged
> it ain't real.
> Wrought iron is.
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