[TheForge] DIY Electrostatic paint gun

[debmiller at fuse.net]

Yes and the auto industry uses electrostatic depostion to improve cover and penetration, as well as "thinner" coats.


> 
> From: "JOHN CHOBRDA" <jchob at verizon.net>
> Date: 2004/10/01 Fri AM 11:58:52 EDT
> To: "'Sponsored by ABANA'" <theforge at mailman.qth.net>
> Subject: RE: [TheForge] DIY Electrostatic paint gun
> 
> 	Correct me if I'm wrong, but isn't this the principal behind powder
> coating. Electro statically depositing a powered pigment onto an object then
> heating until it melts and forms a coating.
> 
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net
> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Bruce Freeman
> Sent: Friday, October 01, 2004 9:09 AM
> To: theforge at mailman.qth.net
> Subject: Re: [TheForge] DIY Electrostatic paint gun
> 
> No.
> 
> But I've seen how certain scientific apparatus that uses the same
> principle works, and there's not much to it, really.
> 
> The nozzle must be given one polarity, the object being painted, the
> other.  I don't know whether it matters whether the "paint" is
> positively or negatively charged relative to the object.
> 
> One VERY serious issue is voltage.  High voltage is needed to provide
> the desired effect.  High voltage CAN be dangerous.  However, the
> current need not be high at all.  Microamps might do (I haven't tried to
> figure it out).  
> 
> If I were to try this (which I'm thinking of doing, but don't know when
> I might get to) I would start by using as a voltage source one of those
> room-ionizers commercially available.  They have a needle that points
> out into the room, the source of the ions.  (I'm not sure where you'd
> find the "ground" on the thing.  It probably is the electrical ground of
> the house electric, but I don't know that for sure.)  The advantage of
> these devices is that they are intended for household use.  You can
> probably get a little buzz from them, but nothing lethal.
> 
> Another alternative would be the flash attachement to an older camera. 
> These charge a capacitor from a battery.  I don't know that the voltage
> is high enough ( they can give you a surprizing shock), but if it is,
> it's certainly a safe source.
> 
> I would be inclined to avoid such things as the corona discharge P/S
> from a laserjet or xerox, as those things may very well put out lethal
> current.
> 
> Hope this helps.
> 
> Bruce
> NJ
> 
> >>> sjs at chargin.org 10/1/2004 12:54:58 AM >>>
> Has anyone ever made or seen plans on the net on how to setup your own
> electrostatic paint system? Ive looked into whats available here and
> its
> quite expensive, I know little about it but its a high voltage/low
> amps
> setup which puts a strong electromagnetic field infront of the nozzle
> of the
> spraygun, the item to be painted is negatively charged and the
> positively
> charged paint jumps onto it just like powder coating. Seems to me the
> "black
> box" etc wouldnt be hard to build yourself. Maybe theres more
> complexity
> than I understand in the system? Anyone got a lead for me, Ive done a
> bit of
> googling without much success...
> 
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