From: Paul A. Thomas (bluewhale@jaxkneppers.com)
Date: Wed Oct 15 2003 - 20:47:15 PDT
Jeez. . My entire house/garage is on a 90 amp service!! ( Originally built
in the middle of WWII, upgraded from 60 amps some years ago ) I wonder if
I could even run a pump which needs 220-240 here. Would a 15-20 CFM
electric motor compressor pull much more amperage than an electric
dryer? I was considering having the dryer line extended within the garage,
then running either one or the other at a time.
Many thanks, once again.
paul
***********************************************************
At 10:09 PM 10/15/2003 -0500, you wrote:
>Hey, I understand. You have to take what everyone else says and figure
>out what works for you.
>
>I don't live in the city, so using a large pressure blaster outside is not
>a big deal. If I was in the city with a small lot, everything would be
>different.
>
>I blasted for a couple years with my 5 hp compressor alone. It ran a 1/8
>tip ok. But when you can generate 30+ cfm, it makes a big difference in
>productivity.
>
>I have a 100 amp service to my garage and can run that 10 hp air
>compressor with a phase converter - no problem. I've never popped the
>breaker. I've even run the 5 hp compressor at the same time, again no problem.
>
>Good Luck whatever way you decide to go.
>
>Dave
>
>
>On Tue, 14 Oct 2003 21:27:54 -0700, Paul A. Thomas
><bluewhale@jaxkneppers.com> wrote:
>
>>Hi Dave:
>>
>>Thanks for your break-down. You, Steve G and half a dozen others all seem
>>to give similar advice based on experience with multiple approaches and
>>makes. To all of those who gave advice like this I appreciate the @#%@#
>>of it: however I need a solution which allows me to come home from OT at
>>work, fire up and clean XXX parts and not spend time setting up, tearing
>>down, cleaning up, loading media. Not to mention my friendly neighbor..
>>If I win the Lotto ( no disrespect intended ) I plan on kicking back, and
>>going to auction after auction. In the mean time, one makes do. The
>>suggestion I read earlier about getting all the power I could from my
>>compressor when I buy it sounds right on: whatever my house's service
>>will take is what I will price.
>>Now to get busy before the local authorities realize I'm doing
>>reconstructive work here!
>>
>>Thanks again.
>>
>>Paul
>>
>>***********************************************************
>>
>>
>>At 10:56 PM 10/14/2003 -0500, you wrote:
>>>I'm partial to Quincy cast iron compressors or similar. The run slow
>>>and produce more air CFM per hp that most other compressors. Also, they
>>>are made to run continously (at least the heavier models are) and then
>>>can run that way all day and not overheat.
>>>
>>>Warning: A real 5 hp motor draws about 22-24 amps at 230 volts single
>>>phase. Sears and several others lie about their hp ratings. I don't
>>>know how they can do that but they do. To make 5 hp, you need about 24
>>>amps at 230 volts, there is no magic way to get around that fact. It
>>>takes about 1000 va (volts times amps) of input power to produce 1 hp of
>>>shaft power for small electric motors.
>>>
>>>I have a real 5 hp air compressor with an old Westinghouse Cast iron two
>>>stage head. It works fine for running air tools and sprayers. However
>>>when it comes to blasting, even a real 5 hp compressor comes up short.
>>>I have a 10 HP 3 phase air compressor that I run off a homemade rotary
>>>phase converter to produce air for blasting. It has a large Quincy 2
>>>Stage cast iron heat that must weigh 150-200 lbs by itself. The pump is
>>>rated at 36 cfm. Everything is mounted on a 120 gallon tank. I bought
>>>the compressor complete (less magnetic starter and controls) for $250.
>>>The guy just wanted to get rid of it. I hauled it home and in just a
>>>couple of hours I had it running. A couple of years ago, I bought a
>>>second Quincy Compressor but with a single stage head that is rated at
>>>34 CFM with no motor and a 120 gallon tank for $100. I have a Linsay
>>>200 lb pressure pot that works well. Lindsay went out of business about
>>>two years ago, so parts are a bit hard to find, but it's a good pot.
>>>
>>>The 10 hp Quincy compressor can run a new 3/16 nozzle at 90 PSI not
>>>quite continously. I can blast for about 10 minutes and then rest for 2
>>>and that works fine. The rest period allows the compressor to catch up
>>>and refill the 120 gallon tank. I end up moving stuff around every 10-
>>>15 minutes anyway it seems so not being able to blast continously is
>>>really not a problem.
>>>
>>>The guy on that site mentioned using Silica sand. I think that is a
>>>waste of time and money. Black Beauty or the equivalent furnace slag
>>>blasting media is a lot faster than silica sand and it is much, much
>>>safer. (Read - more metal blasted for less $) IMO, that guy on the web
>>>site used the wrong equipment. Spending 5 weeks of 10 hours days
>>>blasting two vehicles! My blaster chews through about 200 lbs of sand
>>>in about 30-40 minutes. But you can cover a lot of metal in 30 minutes.
>>>
>>>My recommendation is to skip Sears all together. Look up sandblasting
>>>equipment in the yellow pages. Visit a commercial supplier of sand
>>>blast equipment and see what they have. Perhaps they have some used
>>>stuff they want to get rid of? Look for auctions, plant closings (they
>>>are happening all over the midwest!), and pickup a nice two stage
>>>compressor that can put out the air. You can run a 1/8 nozzle off a
>>>real 5 hp compressor, but you need to take breaks to allow it to catch up.
>>>
>>>If I had to blast a duece and I had no equipment, I'd probably rent a
>>>gas or diesel compressor and a sand pot and buy about 1000 lbs of sand
>>>and go to it. That equipment can easily get the job done in a day. If
>>>you buy a Sears 5 hp compressor (really about 3 hp) and a cheap siphon
>>>blaster, you could spend a week or more blasting the same truck.
>>>
>>>Dave
>>>
>>>
>>>
>>>
>>>On Tue, 14 Oct 2003 16:10:30 -0700, Paul A. Thomas
>>><bluewhale@jaxkneppers.com> wrote:
>>>
>>>>This list is great! I have received the opinions of perhaps two dozen
>>>>listers regarding their thoughts and experiences with different types
>>>>of abrasive blasting and the manufacturers of the equipment. Based on
>>>>what I can do now and those suggestions, I'm going to buy a Skat 960
>>>>cabinet soon.
>>>>
>>>>However my 9 month old portable air compressor is not up to the job,
>>>>not even with a small carbide tip on the gun. When I have no other
>>>>idea what to do I usually go to Sears and see what they have, then buy
>>>>what I need ( hopefully ). Could anyone give me their thoughts on
>>>>brand and type of air compressor to look at for this? I found a number
>>>>of opinions about blasting and air compressors on line, but found this
>>>>one echoed what listers were saying closely so thought to TRY to use
>>>>his recommendations..
>>>>
>>>>http://www.speedprint.com/Deves50/Sandblasting.html
>>>>
>>>>However I'm not going to be doing anywhere near the volume he does, so
>>>>am currently considering a Sears unit with an 80 Gal tank, a 7 horse
>>>>two stage engine, 240 volt. Puts out 16-18 CFM at 100-175 PSI.
>>>>Overkill perhaps for the blasting cabinet, but I also will be using a
>>>>pressurized gun on parts of the trucks which will not fit into the
>>>>cabinet, so the extra power will probably come in handy.
>>>>
>>>>Thanks for all of the responses. I don't like spending money, but when
>>>>I have to do it I really dislike wasting it on something that doesn't
>>>>work well. :}
>>>>
>>>>
>>>>Paul
>>>>MVPA# 24986
>>>>'53 REO M35 Fire Conversion
>>>>'53 AEC Chevy 3/4 Ton
>>>>www.paulathomas.com/images
>>>>
>>>>
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>>>
>>>
>>>
>>>--
>>>Dave
>>
>>
>>===Mil-Veh is a member-supported mailing list===
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>
>
>
>--
>Dave
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