On 10/11/23 21:30, Matthew Herd wrote:
Hello Gene,
4HP peak is probably more like 2HP in actual use. They’re probably measuring
peak current draw during startup and extrapolating that to horsepower with the
clear intent to bamboozle the unsuspecting consumer. At 120V, 4x750W is 25A.
Considering they’re designing this to run on a 15A circuit, something doesn’t
add up. Real draw won’t exceed 12A continuous. Which is as I guessed above,
about 2HP.
Matt
Well, with a fairly free flowing 3d printed muffler, and a 1.75" 12 foot
hose replacing the original 10 foot, 1" hose, my calcs, base on the diff
in square area between the hoses, and the same ratio applied to the old
ones 6.5 amps, roughly translates to 16 amps. Plugged into the same 20
amp breaker that runs the go704, it didn't trip the breaker but I'd bet
it was warming up. Max draw is about 20 amps with a locked spindle for
the go704. A heavier load on the go704's spindle probably would have
cleared the breaker. Typical is around 3 amps for the go704.
Its CCS service by the vac I'm concerned with, where most vacs happily
are on for 5 minutes and have hours or days to cool from the heat surge,
So I'm worried if I see over 7 amps on the Amprobe in the steady state
running. What I have, but not yet wired into it, is a small box with
two 40 amp SSR's controlled by the flood button in linuxcnc so I turn it
on and off with m8/m9 in the gcode I write. Two SSR's break both sides
of the line. But that duality was because the original power switch was
a dpst miniature rocker.
I have a high kilowatt powerstat that will give me some control too, but
I'd druther not tie it up running the vac till the rapture.
Thanks Mathew.
On Oct 11, 2023, at 9:08 PM, gene heskett <ghesk...@shentel.net> wrote:
I blew up old bucket-vac by putting a larger diameter hose on the intake.
This raised the air flow and the amps it drew, and apparently tripped a one
time thermal fuse about 9 minutes into a 12 minute job.
So now I am adapting by 3d printing, all the plumbing to use a 5 gallon
wet-r-dry as a vacuum src, but this puppy came with a different motor claim, 4
hp peak, and no amperage data where the decade + older bucket-vac claimed 6.5
amps and IIRC 2.5 hp.
This one claims 4 hp peak but that is likely only for short term use and this
may run for a day at a time, possibly even longer. Sucking up swarf or saw dust
as my go704 works.
I have no clue how to translate 4hp into the amps I'd see on an Amprobe which
would equal 4hp on a 125 volt circuit. What I intend to do is restrict the size
of the intake nozzle until the amps drop to whatever corresponds to 3.5 hp.
These things are $50 a pop at Wallies, and I'd like to run it at something
resembling a CCS rating.
Does anyone have a clue how to translate that 4hp into amperage for the motor?
Thanks all.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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