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taffy0687(at)yahoo.com
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 Posted: Mon May 22, 2006 8:25 am Post subject: Air tools & Compressor/ hp. vs psi. |
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Frank H. ---- in an earlier post you said your Sears compressor is 6 hp. Is this the actual hp. or the inflated hp. Not that is matters, as we can agree that the performance is what counts------- but we should compare apples to apples, for the folks who are looking at the numbers in order to buy a unit (our units regardless of hp ratings work fine) It appears the "buyer's" should be looking at the "6.4 scfm (at) 90 psi" (etc.) vs. the hp rating.
Fritz---- Corvair
do not archive
The compressor mentioned below is less than 2HP...120V* 15amp ignores
the power factor of the motor which can be assumed to be about 0.8.
So 120V * 15A *0.8/ 0.746 = 1.9HP motor horse power
Frank
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frank.hinde(at)hp.com
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| Posted: Mon May 22, 2006 8:54 am Post subject: Air tools & Compressor/ hp. vs psi. |
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Its most definatly the inflated number. If you think about it the most
you can get reasonably is about 15A, Yes I know you can get 20A in the
US but the in-rush current on a true 20A motor would probaly pop 20A
panel breakers regularly.
So 15A equates to less than 2Hp on a 120V supply. The max you would get
even on a 240V supply would be aroud 4Hp. Personally I would avoid a
240V machine unless you are sure it will be permanently in one place.
Yes I agree the SCFM number(at) 90psi would be a better comparison but even
then you have to read between the lines...I mean what if the SCFM number
is shown at 70psi...Whats the comparison?
All the domestic quality machines are going to run about the same
efficiency so you can get a rough idea on the max amps the thing draws.
I.e 15A= 2HP. 7.5A = 1HP etc.
What we do know is a 15A machine with a 30 Gallon tank is more than
adequate to do everything on an airplane and in the shop.
Incidently, I would be wary of Harbor Freight compressors. I have a
small HF pancake compressor for portable jobs like nail guns etc and it
works great for the $80 I paid for it. Occasionally though it will stall
on start up. This is not what you want if your in the middle of a paint
job, you got to turn it on and forget about it till the end of the day.
As an owner of more HF tools than you can shake a stick at I would say
the compressor is the one place I personally would NOT buy Harbor
Freight.
Frank
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John Bolding
Joined: 23 May 2006
Posts: 281
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| Posted: Tue May 23, 2006 9:55 am Post subject: Re: Air tools & Compressor/ hp. vs psi. |
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This is one of those subjects that has a LOT of potential for some serious BS to be spread around (from the compressor sellers, not the list members) Try this website,http://www.eatoncompressor.com/page/page/518643.htm open up one of the bare pump descriptions and you will find out all you ever wanted to know about hp/amps/cfm/pressure.
I sold air compressors for a living for over 30 yrs and this company has about the best value in the country on air compressors. That is if you are looking for a quality tool. LOW&SLOW John Bolding
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