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How to Build A Powder Coating Oven

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In the process of powder coating, dry powder is sprayed on to the required object and then it is placed inside a curing oven to cure the object.

Oven should be capable of emanating high temperatures, around 450 degrees (F). Furthermore, the coating over should be big enough to fit the required object comfortably into the oven. So, the capacity of the oven depends on the size of the coated object. For beginners, there are 4 types of oven available:

  • Toaster oven
  • Household oven
  • Harbour freights oven
  • Propane grill

For powder coating of larger parts, you are going to need a larger oven, which is expensive. The most economical option henceforth is to build the oven yourself. As you are building your own oven you can also add some extra personalized features. This article will help you to build an oven which has powder a coating rack. Powder coating can be done on the rack and then whole rack will fit into the oven for curing. You will need at least $1000 to build a custom base oven of large size.

Tools required:

The first thing you need to build the oven is a steel stud and steel track frame engrossed together. Cover both sides of frame with a thick metal sheet. You will need approximately 20-gauge metal sheet. The floor needs a thicker gauge metal sheet. The best way to buy these things is to get them locally from metal shops around you. Shipping of such things are expensive. Place your insulation between the two layers of metal sheet, before placing your heating elements inside the oven which is connected to the control box.

Manufacturing:

The frame of the oven is manufactured with galvanized steel studs. Steel track can also be used as a replacement for steel studs. They can easily be cut with a chop saw and tin snips. Stanley Aviation strips are usually recommended for this job. The steel framing is upheld to its shape with help of rivets. Firstly, drill a hole then place the rivet in the hole with rivet gun and lastly squeeze it to make it firm. Pneumatic rivet gun is the best option for this purpose. The optimized size of hole is minimum thickness of .13" and a maximum thickness of .125". One thing to keep in mind is to use same type of rivets and metal together. In this case, make sure both rivets and frame are of steel.

Make the floor size of the oven exactly as you want the overall oven size to be, as your walls will be built upon the floor. Overlap the studs on the corner of the floor. Then rivet them where they overlap on top and bottom. Speed squares can be used to square up all corners before riveting. Once the sides are done you can add more studs on the floor to provide support for the frame. The walls are made the same way using studs and rivets. Place the walls on the floor and tie them with rivets. Walls and ceiling are also riveted to each other for support. Every bit of the oven needs to be insulated. Insulation is normally present between the hollow space of studs. However, in this case, the heating elements will be in these hollow spaces so you will need separate insulation sections outside of box. If you don’t want to recess heat items into the oven, you can add more studs into the floor and avoid the boxed sections explained above.

As the frame is done, line it with metal sheet. Metal companies that sell metal sheets have massive brakes that can cut the sheet as per your demands. Galvanized steel sheet is recommended as it keeps the oven rust free. 16 to 26 gauges is the appropriate thickness range for a metal sheet. If thin sheet is used the oven will heat up faster, but if thick sheet is used it will isolate the heat and will help to maintain the temperature in colder environments. Firstly, lay down the 16-gauge sheet on the floor and tie with rivets. Then cover the walls with 26-gauge sheet. When the entire oven is skinned, make the cut-outs with Dermal for heating elements.

For circulation of air you need a convection fan at the top. It also equalizes the temperature of the whole oven. Dayton 310cfm High-Temp Blower is mostly recommended. Use 650 degrees F Sealant to air tight the seal. Then rivet the top metal duct sheet. With this the convection part of the oven is finished.

Lightning:

You need 3 recessed lights in the ceiling of oven. Recessing is crucial as it will prevent the lights to come in way of powder coated items. 4 parts are required for assembling of light.

  • Porcelain lamp holder
  • 40-watt light bulbs
  • 6-inch duct tape
  • 6-inch duct flex connector

The holder and bulbs are completely capable of withstanding the high temperature of oven. Drill holes in duct cap for lamp holder and wires. Place the end cap with lap holder onto the duct flex connector, then frame the assembly with steel studs.

 

 

Reference:

http://www.powdercoatguide.com/2014/09/how-to-build-powder-coating-oven.html#.WWZdyIiGM2w

 

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Last modified on: August 10th, 2020 06:41 PM, EST

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