| Powder Coating at Home |
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I've known about powder-coating
since seeing it in the Hot Rod & 4x4 magazines I started
reading back in the early 80's. It's always been appealing
for it's durable finish that is so resistant to wear and fade.
Coating offers a finish that conventional painting just can't
match and it's ability to "fill in" and smooth out the rough
surfaces of many of the small castings that I plan to work
with. Small errors in the surface finish are easily hidden.
A while back I picked up
a home powder-coating setup from the Eastwood Co. I've seen
them for quite some time and finally the price came down enough
that I was able to afford it. You don't need much to powder-coat
your own parts at home. Everything needed is shown here except
for the powder itself.
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You'll need three things to get started. ONE:
You need a powder-coating kit; this will include the spray
gun, powder and electronics. TWO: You'll need
a small compressor, as you can see I have a small Campbell_Hausfeld
compressor that's portable and convenient for uses like this
and airbrushing. When powder-coating you'll use no-more
than 10psi, I usually use about 8psi when spraying the powder.
THREE: You'll need an oven of some sort that's
capable of going to 400*. An old kitchen stove would be ideal
but I use a small toaster oven for right now. Whatever you
use becomes a dedicated shop stove; you can't cook your French
fries in it after powder-coating.
I found the kit on sale, bought the compressor
used and was given the toaster oven so I have less than $125.00
into the whole affair. For a single Dad on a fixed budget,
low cost is paramount.
I'd been waiting for a suitable victim to come
along when I happen to cross paths with the nifty little toolholder
seen in many of my more recent pictures. I keep several colors
of powder on the shelf for just such an emergency. The toolpost
spends most of its time on the Homer lathe, which is a dark
blue so I figured I'd give Ford Dark Blue a whirl. Here's
a picture of the toolholder with the holes plugged to prevent
powder from getting to the threads. The tape used in the cross-hole
is a high temp fiberglass tape that I bought through Eastwood
and the wire is stainless steel safety wire that came with
the kit.
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| After getting
it ready it was hung outside. A plastic jar containing the powder
is attached to the gun and everything is plugged in. A ground
wire is run to the workpiece, I use the stainless wire and attach
the ground clip to that so that I don't have to ground to the
work directly. To actually spray the powder is a two-handed
job, you have to hold a switch and depress a trigger button
with one hand (this sends an electrical charge thru the ground
strap to the work piece) and use the other to trigger the powder
and spray the workpiece (this sprays the powder which is electrically
charged and draws it to the workpiece). When you're ready to
go it looks like this. |
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| Once it's
been coated with powder the piece is very fragile. The powder
can be easily wiped or blown off. |
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| After being
powder-coated the part is carefully taken down and placed in
a preheated oven at 450'. After a couple minutes the temp is
turned down to 400* and the part will stay there at that temp
for approx 30 minutes while the powder melts and flows across
the surface. No drips or sags at all, multiple coats can give
various effects but I haven't gotten fancy and tried any yet.
To make hanging the parts easier I drilled a few small holes
in the top and side of the toaster oven that allow me to just
take the work off a hook and pass the wire thru the hole in
the oven and secure it while the part bakes. |
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| After a
half-hour I took out my shiny new toolholder and here's what
I had. |
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I was thrilled with my first try. The finish
came out smooth and hard and almost all of the jaw-marks and
surface flaws have been completely covered up.
I was so pleased with the results that I tried
again with a larger project. This was where the shortcomings
of the toaster oven became apparent. If you have the room
to set up an old kitchen range then I would strongly advise
you to do so, the added capacity will make many more projects
possible. I explored the maximum capacity of my toaster oven
with the drawtube for my 3C collet adapter for the 7" lathes.
I had cut a section of steel tubing down, pressed in a threaded
insert I made to fit the 3C collets and brazed on a handwheel
salvaged from a broken lathe apron.
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| I wanted
to try a different color and decided that a Hammertone Gray
would suit this particular tool just fine. Unfortunately the
5" handwheel was just about the largest thing that would pass
through the oven door. Hanging and powder-coating it presented
no difficulties but transferring it unscathed into a 450* oven
was no small task. Fortunately for me multiple layers of powder-coating
can be laid down to build up tolerances or to repair mistakes.
I bumped it a couple of times and rubbed some of the powder
off. I'll probably do it again when I find a larger oven to
use but it still came out very nice overall. You can see just
how smoothly the powder flows and covers. |
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| I really
like the way the Hammertone came out. When I see powder on sale
again I'm going to buy a lb. Or two to use on other shop tooling
and accessories like this. I recently stumbled across some manganese
Parkerizing solution that I'm eager to try out on some replacement
lathe parts. Here's the whole set with the newly powder-coated
drawtube. |
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