A shop vac should be able to run continuously with no hose attached without overheating. However what would overheat one fairly quickly, would be running with a restriction in the exhaust. Perhaps you're muffler is adding too much backpressure?
Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 -----Original Message----- From: gene heskett <ghesk...@shentel.net> Sent: Wednesday, October 11, 2023 10:04 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] silly Q #42 [EXTERNAL EMAIL] Be sure links are safe. 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://gen/ >> eslinuxbox.net%3A6309%2F&data=05%7C01%7Ctoddz%40pgrahamdunn.com%7C08b >> 2b2f6f92441cd302108dbcac9f2ad%7C5758544c573f47cebee96c3e0806fb43%7C0% >> 7C0%7C638326740971431741%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAi >> LCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata= >> YM8H%2FfSwN62xRpKFPYbmw%2FiA8kAnNRC5%2ByXJOksuFg4%3D&reserved=0> >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lis/ >> ts.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7Ctodd >> z%40pgrahamdunn.com%7C08b2b2f6f92441cd302108dbcac9f2ad%7C5758544c573f >> 47cebee96c3e0806fb43%7C0%7C0%7C638326740971431741%7CUnknown%7CTWFpbGZ >> sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0% >> 3D%7C3000%7C%7C%7C&sdata=vrUU77ARPmSG4E60VB0hPZWoZ7MuHu%2BSqdbRdSfv2w >> 0%3D&reserved=0 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://list/ > s.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7Ctoddz% > 40pgrahamdunn.com%7C08b2b2f6f92441cd302108dbcac9f2ad%7C5758544c573f47c > ebee96c3e0806fb43%7C0%7C0%7C638326740971431741%7CUnknown%7CTWFpbGZsb3d > 8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C > 3000%7C%7C%7C&sdata=vrUU77ARPmSG4E60VB0hPZWoZ7MuHu%2BSqdbRdSfv2w0%3D&r > eserved=0 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/> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
