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Posted by Bobk207 on June 8, 2007, 12:00 pm
>
>
>
>
> > the output of the compressor only dictates how continuous you can blast.
> > Even a little dinky compressor with a big tank will work if you don't mind
> > waiting for it to recover. I have a little itty bitty emglo compressor on
> > top of an old 110 gallon tank, I can do anything I want as long as I
> don't
> > mind waiting. In the case of blasting, air sanding, etc.
>
> > --
> > Steve Barker
>
>
> > >> wrote:
>
> > >> >> wrote:
>
> > >> >> >Anyone got experience with the small sandblasting units like this
> one
>
> >http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=34202
>
> > >> >> >What would be great is to point me at a web site that helps a
> novice
> > > like
> > >> >me
> > >> >> >figure out how much sand to put in it, how to pressurize it
> properly
> > > and
> > >> >how
> > >> >> >to set the valve levers when it's in operation. I have followed the
> > >> >> >instructions but it seems to only really work for about three
> minutes
> > >> >before
> > >> >> >it loses pressure, I know it's something I'm doing wrong but I
> don't
> > > know
> > >> >> >what. If anyone has experience with these things I would appreciate
> > > some
> > >> >> >help.
>
> > >> >> >Harry
>
> > >> >> Can your air compressor deliver the 6-25 SCFM needed? I'd guess the
> > >> >> real air demand is about 12-15 SCFM which is a *large* compressor.
>
> > >> >Hey peter
>
> > >> > I just went upstairs and wrote down the setup details from the setup
>
> > >> >the sand blaster is
> > >> >http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=44762
>
> > >> > a.. Abrasive hose: 8 ft. x 3.4'' diameter
> > >> > b.. Valve material: brass
> > >> > c.. Abrasive capacity: 20 lbs.
> > >> > d.. Air consumption: CFM 6-20 @ 125 PSI
> > >> > e.. Air inlet size: 1/4'' NPT
> > >> >AND the compressor is
>
> > >> >Air america 5 hp 20 gallon Model f5020
> > >> >displacement 11.9 cfm
> > >> >8.8 scfm @ 40 psi
> > >> >6.9 scfm @ 90 psi
>
> > >> > What do you think?
>
> > >> >Harry
>
> > >> Compressor is not large enough... <g> That 6-20 CFM on the sand
> > >> blaster is a bit misleading. The lower value(s) are if you are using
> > >> it about 10% of the time, basically playing. They give that number so
> > >> people who have small compressors will still buy it!
>
> > >> Best bet may be to rent a big compressor (I'd suggest one that can do
> > >> 20 CFM) for the job.
>
> > >> Bottom line: a 7 CMF compressor won't give enough air.
>
> > > thanks this makes more sense now, I'll go out and rent a bigger one.
> > > Thanks
> > > for your help.
>
> > > Harry
>
> thanks for the heads up steve, I'm pretty patient but it's a big loft ( 60
> * 30 ft) with a apex at about 14 feet.
All good suggestions.......
you need a bigger compressor if you want to get serious work done in
reasonable amount of time (& not keep waiting for the compressor)
Compressor mfrs overstate their horsepower & cfm numbers....tool mfrs
tend to get wide ranges with low ends that just don't work.
The combination results in general disappointment in using air tools.
With good tools & the right amount of air....air tool usage is really
sweet.
One thing not mentioned is provide for media / debris collection
(heavy plastic, drops or cardboard arranged so that all flows into a
trough or container)
otherwise you'll generate a real mess in that attic. I set up a
"blast booth" (only three sides & a top) to corral the sand & debris
(paint).
I re-used the sand by running it through a series of sieves to get the
junk out. If you're got real messy stuff to deal with, re-use might
not be an option.
cheers
Bob
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