[TheForge] Re: Sand blaster problem: hose blows off

[Mike Spencer]

Ries wrote:

ries> A siphon gun works the same way, its just that the T is inside
ries> the gun. The air hose comes in the back of the gun, like yours
ries> comes into the T, and the hose from the bottom of the T goes to
ries> the sand pile. The third leg of the T is the nozzle.

That's how a paint sprayer works, only it usually has a paint canister
right on the gun.  Does your sandblaster have a canister on the gun?

Seems like a hard job to get enough Bernoulli effect to pull sand
trough a hose from, say, a bucket on the floor.

ries> You could braze a pipe fitting on the gun, and another on the T
ries> and then use an air hose with threaded fittings- that would be a
ries> final fix.

Yeah.  That's the plan if one more try with clamps fails.  The gun is
already threaded -- just need to find the right fitting.  The tee is
steel so I can braze or weld a fitting on to it.


Bob Ehrenberger wrote:

be> My sand blaster doesn't have the hose come off, but if you don't
be> get the air flowing before opening up the valve to the sand it
be> fills the hose up with sand and plugs everything up.  Maybe that
be> is what is happening and then when the pressure builds up it blows
be> the hose.

Using medium-sized glass bead, if I open the valve to the media all
the way, I get a stream of powder instead of a fine blast of grit.
But that is *not* what was happening when the hose blew.  Everything
was working just right.

> It may also be that your compressor has too much pressure for the
> connections and needs to be dialed back a little.

Well, it's rated for 120 psi, I was using 100 psi and cut back to 90
after the first blow-off.


- Mike

-- 
Michael Spencer                  Nova Scotia, Canada       .~. 
                                                           /V\ 
mspencer at tallships.ca                                     /( )\
http://home.tallships.ca/mspencer/                        ^^-^^