Re: [CAD_CAM_EDM_DRO] Formula

Steve

The 6 lb/ft and the 30 lb/ft are right off the motor tag. The motor is 4.5"
diameter, 10' length, plus the tach
housing or at least that is what I think it is. It has a second commutator
with brushes or diodes mounted to
the end of the main motor. So I am guessing that it's a tach or something
else. I really don't have a clue.
I did hook the motor up to a small DC power supply that I have and it would
jog each time I touched the
wires, so I turned the motor by hand when I touched the wire and it started
to turn over. I am sure the power supply was much to small. The motor also
has a 3/4" shaft. I put the motor on my UPS scale and it
tips the balance beam at 32 lb 8 oz. Kind of hefty.

Bruce

-------Original Message-------

From: CAD_CAM_EDM_DRO@yahoogroups.com
Date: 02/16/05 11:26:09
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Formula

Bruce Pigeon wrote:

>Steve
>
>Thanks
>
>Then my cont stall at 6 lb/ft x 12 x 16 = 1152 in oz if I did that right.
>The peak stall is 30 lb/ft x12 x16
>=5760 in oz. If that is correct then that should be enough to power the
>gantry I am building for my cutting table, or maybe it's over kill. Maybe

I

>will have to build it larger to utilize the available power.
>
>The formula makes sense now that I see it.
>
>Again thanks, I would be lost without these lists.
>
>Bruce
>
>

No problem.

Regarding the motor - that sounds like a pretty big one, are you sure
those ratings are foot-pounds and not inch-pounds? Also, were both the
6 ft-lb and 30 ft-lb numbers specified, or did you multiply the
continuous rating by 5 to get the peak? The reason I ask is that you
should probably be conservative if you're estimating I'd multiply a
continuous rating by 4 (or maybe 3) to get peak, or divide a peak rating
by 5 (assuming that people who only quote peak ratings are hiding
something :) )

- Steve



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