|02-16-2013 09:30 AM|
|Ironpony||I have built my own powdercoat ovens for years. I even took some of my ideas and put them on a dvd I sold on ebay. In the dvd I showed how you could build a 3' wide by 4' tall by 6' long oven for under 500.00. I sold a bunch of the dvd's for 29.95. Then I noticed several guys using my design and building and selling them on ebay. So rather than fight it I just let it drop. So I will tell you all what I do. First I build a perimeter frame from 1" sq. tubing and build 2-1/2 doors and hinges to mount them on either side. of one end. I build runners to fill in the gaps from 1/2" sq. tubing almost like you would build a wall in a house. Except that I put them flush with the outside. I paint everything with high temp exhaust paint to keep it from rusting. Then I use 3 sheets of 20 ga. sheet metal to line the inside. and I flange the ends with a roller but you can use a pair of flanging pliers or put it up against a edge and just beat it over to a 90 deg. flange about 1/2". I cut the pieces about 1/2" smaller than the inside for expansion. when I put the pieces in I seal the edges with furnace cement. and this will sound weird but I only use one screw per panel. I then wrap the whole thing with 1" thick ceramic wool insulation. I cover the outside with corragated sheet metal like you would use on a barn. I buy 3-220 volt heating elements for commercial ovens, I get them on ebay for the most part. When I am on ebay I look for a electric oven thermostat and a #1 magnetic motor starter. I mount these on the side of the box and place the heat sensor at the 3/4 from the bottom on the side about half way back from the front. I put a vent in at the top that is only a 1" hole but I mount a 3" roof flange with it centered right over the hole. I then use 3" double wall vent pipe to the out side. I don't use a fan but I do put a heat deflector over the heat elements that are mounted to the bottom. For this I use a piece of 1/8th inch steel and cut it so that it is a inch smaller than the bottom of the oven and mount it with stand off's so it's a 1" above the elements. I add some things for conveniance like doors that open with a step down lever and then spring back so your hands are free. I also built a T shaped track at the top center. And some small rollers with hooks so you can slide a part in thats hanging. I have also built a rack on wheels that has a track just like it that ties into the track on top of the oven and you can slide some large items in and out with out touching them. I wire the elements to the output side of the magnetic starter and then use the temp control to turn the elements on and off. I wire up a idiot light to tell me when the elements are on. So when the light goes out it is at temp. I also rig up a timer so that it will shut it off when it gets done. I have run these ovens for many years and it cost about twice what it costs to run a household oven. I have added some picts of a oven I built for a friend of mine just to put ceramic coating on exhaust's. He builds custom kit cars and has a walk in oven for parts coating. And I have a pict of a motorcycle frame too just to show that this works. I have looked long and hard for the DVD master that I made and cannot find it anywhere. But this is not hard to do and I would be more than willing to help someone out. I always thought this would be great for a club to share expenses. Thanks Bill|
|01-13-2013 10:41 AM|
Here is an update on the kiln I used for powdercoating. I wrote a book on how to do it using a programmable circuit called the Arduino:
Powder Coating an Arduino
I have done over a 1000 small parts now. Kilns are cheap on craigslist often. The ceramic industry is in a slow down.No one can afford the labor anymore and kilns are plentiful:
|01-13-2013 10:28 AM|
matus: i use a regular oven for powder coating, they are free and come with a thermostat, heating element, insulated and a door.
my spray booth is an old tv box
|10-15-2011 11:33 AM|
This is something I did this morning. It is made from 3/16" plate. The color is Eastwood "smoke Chrome" which is more of a metallic grey. There is a powder coat clear coat on top.
|10-13-2011 08:15 AM|
I measured my kiln and it is 17.5" octagon 18.5" deep. There are much larger kilns though. Automated ceramic kilns are getting pretty popular in the ceramic industry and non automated kilns are going pretty cheap. Used ceramic stuff in general is pretty cheap.
The nice thing about a kiln is it warms fairly quickly and you can do some higher temp coatings. I can fit exhaust from my MGB in this...It has a Chevy V6. That is about as large as I could put in here. I am going to make a stand to support things which sits in the bottom.
|10-12-2011 08:42 PM|
Today I did an accelerator, an MGB brake/clutch assembly bracket and a box (non car related) which was about 12x10x8.
Anything big I take to the professional powdercoater down the road but this is convenient for small-medium sized stuff.
|10-12-2011 07:20 PM|
|31Vicky||You do need vents. Some powder coatings give off materials during curing that need to be vented out. Commercial ovens turn the air over several times an hour. The dampers need to be max 85 percent. Another words a closed oven will be a problem. The vapors coming off some powders are hazardous.|
|10-12-2011 07:04 PM|
What are the internal dimensions of that kiln?
|10-12-2011 05:51 PM|
I am using a ceramic kiln as I type for powdercoating.
I originally set this kiln up for heat treating metal. I have yet to experiment with it for that but it is a natural for powdercoating. It is capable of holding temps to 2400 degrees.
Old ceramic kilns can be pretty cheap. You will want to look at the coils as old kilns often need replacement coils. It is not hard to replace them and they are not that expensive.
To control the circuit, I use a microprocessor circuit...which you could do too i you have any aptitude to electronics.
First I am not using a core microprocessor but a package system which is fairly basic in operation. I have been using what is called an OOPIC but they fell off the face of the earth over night. A very common replacement would be an Arduino.
I don't know if this is in the scope of what you can or want to do but it is how I approached it.
In the programing I pick climb rate fast or slow, peak temp, hold time. I am going to modify it to use two peak and hold times.
I have a 55g drum I am experimenting with. I put the part in the drum and spray it. I am thinking of a low volume fan/filter in the side to keep the airflow going through.
Pick my temp, pick my time, drop in the part.
It is real easy for assembly because I can turn on the kiln, sand blast a part, clean it, coat it, fire it and within an hour or so be putting the part back on the car.
|10-12-2011 01:25 PM|
powde coat oven
first building the box approx 36" x 48 " either cold roll or hot roll sheets w/ angle iron for frame. large holes on oppisite side for venting system , cover vents with maybe dryer vent metal parts. For thermometer using a oven thermoter buy one for 4.00 at walmrt. oppisite side lower bottom drill large holes for electic fan, I have old window fan w/ speed adjustments , i will also cover and make intake vents. bellow inside the the box will be where i can slide in the hot coals tray maybe 6" deep 12" x 12"
of coarse it will be insulated so the part im baking does not get direct heat, heat will come from sides lower and upper to sort off cause a convection effect. I also plan to put side rails for racks and a swivel hook an exuast vent to avoid high pressure problems. door piano hinged double walled with insulation approx 40 " and Coal door flip down approx 7 " I estimated cost around 300.00 when completed, time to complete approx 12 hours.
Considering the cost for a large oven thousands more this my best bet, i will send pics when complete and pics of my completed projects.
|10-12-2011 09:57 AM|
|10-11-2011 06:44 PM|
|08-08-2010 04:51 AM|
|cutthroatkid||Thanks,lots of good info!|
|08-07-2010 11:36 PM|
Lots of good info and powder coating supplies also.
|05-12-2010 07:36 AM|
|poncho62||Friend of mine down the road is building one...using an old industrial oven.....is at least 3 ft wide and 5 ft tall.......ill hold pretty big pieces.|
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