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Posted by Harry Palmer on June 4, 2007, 11:16 pm
>
> "Harry Palmer" wrote...
> > Anyone got experience with the small sandblasting units like this one
> > http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=34202
>
> Not that brand, model or size, but experience nonetheless.
>
>
> > 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.
>
> First thing is that you really need a compressor that can keep up.
> Since you really didn't give any details as far as what type of media,
what
> you are trying to blast, etc., it's kind of hard to give any advice.
> Different media require different settings, but there are really only two
> adjustments that need to be made and most times it's a trial and error
> thing. The valve after the pressure gage is your tank pressure (as it
> appears in the picture). Heavy media like silica require more pressure
and
> larger nozzles, lighter media like walnut shell require less pressure.
> There should be a valve at the bottom of the tank, this will control the
> amount of media that is fed through the nozzle. The goal is to make those
> adjustments to where the media is barely visible coming out of the nozzle.
> BTW, you are keeping a constant supply of air to the tank, right?
>
> --
> hawgeye ©
>
>
Hey Hawgeye
thanks for the reply. Right now I'm planning on cleaning some interior
brick in my attic. It's a knee wall and its covered in about 120 years of
Chicago crud. I'm using a media called black beauty
http://www.flatrockbagging.com/sand/abrasive.html and the nozzle aperture is
about the diameter of a pencil lead, is this too small? I've been using the
blaster with the media throttle ( bottom of the tank) open full, so based on
your info I'll throttle it back until I can barely make out the stream,
thanks for that really great advice. I'm trying to get the compressor to
keep a steady pressure of about 60 psi but it keeps dropping off. I'll keep
plugging away though.
thanks for your great advice
Harry
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