Re: [CAD_CAM_EDM_DRO] Off topic please read and reply likewise

A simple brake dyno is adequate for that power range.. The brake can be
anything from a water pump and valve to an automotive disk brake and
caliper.

The caliper (if using a disk) is mounted to an arm that pivots freely about
the same shaft that carries the disk. Torque is the tangential force
measured at some convenient point on the shaft multiplied by the distance
from that point to the pivot. The more you squeeze the caliper, the greater
the torque. Horsepower is just the torque times the RPM and a few
conversion factors (1HP = 550ft.lb./sec.). Piece of cake!

Seems like someone would have such a contraption posted on a webpage
somewhere in the world.

Doug

----- Original Message -----
From: Josh Lane <jlane@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, April 28, 2002 11:43 PM
Subject: [CAD_CAM_EDM_DRO] Off topic please read and reply likewise


> I would like to Biuld a small semi acurate engine dyno. I have really no
> money to put into the project but I do have a small shop full of
> computers and parts including printers and old drives? I was thinking
> of using a stepper motor with a resistor load on it to get a voltage and
> current and posibly use the frequency for rpm measurement. I am not an
> engineer or a designer but am mechanically inclined and have a good
> knowledge of electronics. The max hp rating will be something like 3 bph
> and will usally be operated between .5 and 1.5 bph. My e-mail is
> jlane@.... I look forward to any help anyone can give.
>
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