From: Paul A. Thomas (bluewhale@jaxkneppers.com)
Date: Tue Oct 14 2003 - 21:27:54 PDT
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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