Homebrew PCBs

I had the good fortune to snag a Leister Labor S7B
hot air wand.  It needs external air.  Near as I can
tell from the specs and my experiments is that I need
about 6CFM at 7PSI for maximum utility.  I could probably
get by on a third of that flow for normal soldering use.
My best small centrifugal blower gives me about 10% of
the flow I want.

Has a 10 foot 1/2" air hose with a power cable running up
the center.  There's a lot of back pressure, so 
something like a hair-dryer blower has almost zero
flow.

Of course, I can take it out into the garage and use it
with the air compressor.  But I'd like to have it usable
inside.  Short of a vacuum cleaner, any suggestions on how to
build a blower that can handle a little back pressure?
Can you stack fans in series to increase the pressure capability?
I envision ten microprocessor fans in a stack and a funnel on the end.


Suggestions?
Thanks, mike

On Fri, 28 Jan 2005 18:00:38 -0000, gettingalongwouldbenice  
<gettingalongwouldbenice@...> wrote:

>
> Of course, I can take it out into the garage and use it
> with the air compressor.  But I'd like to have it usable
> inside.  Short of a vacuum cleaner, any suggestions on how to
> build a blower that can handle a little back pressure?
> Can you stack fans in series to increase the pressure capability?
> I envision ten microprocessor fans in a stack and a funnel on the end.
> Suggestions?
> Thanks, mike


can't you run a hose to the garage?

I made a small shop air system from a fridge compressor and a empty fire  
extinguisher.
The pressure switch was made from a pressure gauge, 2 light barrier  
switches, and some clever transistor logic ;-). You see, "air on a budget".

Of course this is very low volume, and i only need it for a desolder gun.  
I don't think it would be enough air for a air wand, for more than a few  
seconds, anyway...

My gut feeling to the stacked fan thing is that ain't gonna work.

The air tools at ebay claim to have a diaphragm pump, but i somehow don't  
see them having much volume.

ST

you might look for a nebulizer pump square box thing i
see them at second hand stores few bucks beleave it or
not they are good pumps i mesured the out put at 40psi
i use one for my air brush
--- Stefan Trethan <stefan_trethan@...> wrote:

> 
> On Fri, 28 Jan 2005 18:00:38 -0000,
> gettingalongwouldbenice  
> <gettingalongwouldbenice@...> wrote:
> 
> >
> > Of course, I can take it out into the garage and
> use it
> > with the air compressor.  But I'd like to have it
> usable
> > inside.  Short of a vacuum cleaner, any
> suggestions on how to
> > build a blower that can handle a little back
> pressure?
> > Can you stack fans in series to increase the
> pressure capability?
> > I envision ten microprocessor fans in a stack and
> a funnel on the end.
> > Suggestions?
> > Thanks, mike
> 
> 
> can't you run a hose to the garage?
> 
> I made a small shop air system from a fridge
> compressor and a empty fire  
> extinguisher.
> The pressure switch was made from a pressure gauge,
> 2 light barrier  
> switches, and some clever transistor logic ;-). You
> see, "air on a budget".
> 
> Of course this is very low volume, and i only need
> it for a desolder gun.  
> I don't think it would be enough air for a air wand,
> for more than a few  
> seconds, anyway...
> 
> My gut feeling to the stacked fan thing is that
> ain't gonna work.
> 
> The air tools at ebay claim to have a diaphragm
> pump, but i somehow don't  
> see them having much volume.
> 
> ST
> 
> 
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Sometimes there are lots of different kinds of pumps (and lots of other interesting stuff!) available for very low prices at:

http://www.labx.com

Good luck.

Regards,

Tom Gootee

tomg@...

http://www.fullnet.com/u/tomg

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