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Old Jan 21, 2011, 11:23 AM
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Balsa for me, thanks.
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Originally Posted by Jimbello View Post
Yes I am tempted to do so too. I am learning to airbrush and have acquired a set of acrylic lacquer in the primary colours, white, black and some clear. I like using it so much, I think I will use it in my detail gun for all my painting. Clear over the top, and a follow up fine grit wet sand and polish if necessary.

I am planning on a very simple conversion of a small shed I have into a spray booth. That will solve the frustration of witnessing small insects and leaf detritus etc. spoiling an otherwise good spray job.
It simply involves installing an extraction fan in the place of one window and filter/screening one of the others. I can block up around the door with hanging drapes or some such material to sufficiently exclude insects etc.
The biggest job will be giving it a good clean before use!

Jim.
Be sure your "extraction fan" doesn't have a standard motor, but rather a brushless, sealed, or external motor. Standard electric motors spark as they run and lacquers are flammable (I'm pretty sure ). I'd do a search first for what type of fans to use or find a friend in the auto body sector to recommend a good fan for you.

~Jake
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Old Jan 21, 2011, 12:25 PM
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Originally Posted by irish_lord99 View Post
Be sure your "extraction fan" doesn't have a standard motor, but rather a brushless, sealed, or external motor. Standard electric motors spark as they run and lacquers are flammable (I'm pretty sure ). I'd do a search first for what type of fans to use or find a friend in the auto body sector to recommend a good fan for you.

~Jake
Very good point Jake! I did not think of that. I will make sure it is brushless, which it looks likes, before I use it. Could potentially create and indendiary bomb.

Jim.
Old Jan 21, 2011, 01:21 PM
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Most PC fans are brushless..
Old Jan 21, 2011, 03:34 PM
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Brushless


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Originally Posted by ziomatrixacs View Post
Most PC fans are brushless..
I just had a quick look at my exhaust fan, and I can see no sign of brushes.
I will make absolutely sure though!

A big computer fan would be ok for a mini spray booth. However, mine will be approx 3 x 2.5 x 2.5 mtr.

Thanks zio.
Old Jan 21, 2011, 04:02 PM
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Originally Posted by Jimbello View Post
I just had a quick look at my exhaust fan, and I can see no sign of brushes.
I will make absolutely sure though!

A big computer fan would be ok for a mini spray booth. However, mine will be approx 3 x 2.5 x 2.5 mtr.

Thanks zio.
http://www.hobbyking.com/hobbyking/s...dProduct=14427

Old Jan 21, 2011, 06:48 PM
karl k is offline
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Yes, "that" Karl...
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A shaded pole motor like in a standard bathroom exhaust fan has no brushes.

No AC induction motors have brushes (except for synchronous motors)
The only other AC motors that have brushes are universal motors, such as in your hand drill, router, vacuum cleaner, etc...

The only contacts that could spark in a furnace style AC motor are in the centrifugal switch to disengage the start winding.

Long story short, use a bathroom fan or a range hood.
No brushes in the motors used in these.
Old Jan 21, 2011, 09:00 PM
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Originally Posted by karl k View Post
A shaded pole motor like in a standard bathroom exhaust fan has no brushes.

No AC induction motors have brushes (except for synchronous motors)
The only other AC motors that have brushes are universal motors, such as in your hand drill, router, vacuum cleaner, etc...

The only contacts that could spark in a furnace style AC motor are in the centrifugal switch to disengage the start winding.

Long story short, use a bathroom fan or a range hood.
No brushes in the motors used in these.
Excellent! Thanks Karl. I thought someone reading this thread would know.
I am now wondering how an induction motor works. I will google it.

Jim.
Old Jan 21, 2011, 09:09 PM
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I'm still amazed, almost on a daily basis just how much knowledge there is to be had on these forums.
Old Jan 21, 2011, 09:13 PM
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Jim,

If you can keep the shed just for painting, then a good way to keep the dust and dirt down is to lightly spray the floor with water before you paint. I paint inside my garage (cars and bikes), and this is an old home painters trick that works very well.

Keep the shed as bare as possible, and it'll make a nice booth. Either that or erect a small inner enclosure of plastic drop cloths.
Old Jan 21, 2011, 11:23 PM
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Originally Posted by Jimbello View Post
Excellent! Thanks Karl. I thought someone reading this thread would know.
I am now wondering how an induction motor works. I will google it.

Jim.
A rotating magnetic field is set up by the stator that surrounds the rotor.
The rotor is constructed is such a way to take advantage of this field. It will have a current induced into it that in turn creates a magnetic field that reacts with the one established by the stator. The rotor is like an aluminum hamster wheel that is surrounded by laminated steel to reduce magnetic losses.
Imagine an aluminum ladder looped into a circle.

http://en.wikipedia.org/wiki/Squirrel-cage_rotor
Old Jan 22, 2011, 01:16 AM
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Originally Posted by karl k View Post
A rotating magnetic field is set up by the stator that surrounds the rotor.
The rotor is constructed is such a way to take advantage of this field. It will have a current induced into it that in turn creates a magnetic field that reacts with the one established by the stator. The rotor is like an aluminum hamster wheel that is surrounded by laminated steel to reduce magnetic losses.
Imagine an aluminum ladder looped into a circle.

http://en.wikipedia.org/wiki/Squirrel-cage_rotor
Very good, simple description Karl! Thank you.
It rings a bell actually, I am sure I read up on them long, long ago. But the old memory.......well I won't go on.

Jim.
Last edited by Jim.Thompson; Jan 22, 2011 at 01:16 AM. Reason: Spelling correction
Old Jan 22, 2011, 09:43 AM
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Yes, "that" Karl...
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I'm just glad something has stuck in my head from the 14 months I've spent in trade school for my 3 tickets
Old Jan 24, 2011, 09:55 AM
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Originally Posted by ziomatrixacs View Post
I like your solution to a brushless fan motor. That should take care of the fumes, no problem. Fumes, paint, airbrush, model, ... compressor. The fumes would be the least of your worries!
Old Jan 24, 2011, 05:58 PM
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Build to Fly? FLY to BUILD!
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ok, I should be asking this on the painting/ finishing section, but because that's the current topic, how do I airbrush things? I have an airbrush, a lot of acrylics, and a compressor, I still need a regulator, but where do I go from here?
Old Jan 24, 2011, 08:41 PM
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ok, I should be asking this on the painting/ finishing section, but because that's the current topic, how do I airbrush things? I have an airbrush, a lot of acrylics, and a compressor, I still need a regulator, but where do I go from here?
There are some good airbrush forums. Not as organised as these, but very helpful. You will find some very experienced people on them to answer questions. I got started with them.
Still learning though, and will be for a long time.

Jim.


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