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Posted by Harry Palmer on June 8, 2007, 10:28 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
>
thanks for your great advice bob, I'm taking the advice of my betters and
getting an expert in to get this done. I need a lot of other brick related
things done so might as well bundle this in with them. Thanks to you and
everyone else for helping make this decision.
Harry
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