From: David Cole (DavidCole@tk7.net)
Date: Wed Oct 15 2003 - 20:09:45 PDT
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
>
>
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>
-- Dave
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