With the onset of cold weather, the issue of heating a garage or workshop becomes critically important for any car owner. One of the most budget-friendly and effective solutions is disk ovenmade from old car wheels. This design not only quickly warms up the room, but also allows you to recycle unnecessary scrap metal, turning it into a useful source of heat.
Unlike factory bourgeois stoves, homemade ones made from disks have a unique design that allows you to vary the size of the firebox and ash pan. The main advantage lies in the thickness of the metal: the rims of the discs can withstand enormous thermal loads without burning out for years. That's why disk ovens often called “eternal” among homemade heating devices.
Before you start work, you need to prepare your workplace and tools. You will need a welding machine, an angle grinder (grinder) and personal protective equipment. The process of creating a furnace requires attention to detail, since the safety of operation and the tightness of the system directly depend on the quality of the welds.
Preparation of materials and selection of disks
The first step in creating a heating device is to find suitable car rims. For a classic potbelly stove, stamped steel wheels from passenger cars with a diameter of R13-R15 are ideal. They have an optimal height and diameter, which allows you to assemble a compact but hot structure.
It is important to note that alloy wheels are not recommended. Aluminum alloys have high thermal conductivity, but can be deformed at extremely high temperatures typical for burning solid fuels. In addition, aluminum is more difficult to weld, which will require the use of argon and special electrodes.
To assemble a full-fledged stove, you will need at least three disks: two to form the firebox and one for the ash pan, or four if you plan to make a two-chamber firebox with an afterburner. You will also need sheet metal 3-4 mm thick for doors and grates.
Don't forget to clean the rims from dirt, rubber residues (if any) and rust in advance. Usage grinders with grinding wheel will ensure the cleanliness of the welded surfaces, which is critical for obtaining a strong seam.
- 🔥 Look for discs without deep corrosion damage and cracks.
- 🔧 Make sure the center holes of the discs match or can be easily adjusted.
- 🛡️ Be sure to check the integrity of the rim - through rust is unacceptable.
- 📏 The optimal diameter for a garage oven is 35-40 cm.
⚠️ Attention: Never use discs with deep dents on the ends to make ovens. When heated, the metal in places of deformation can lead to depressurization of the firebox and carbon monoxide entering the room.
Necessary tools and consumables
The quality of the stove assembly directly depends on having the right tools. The main emphasis is on cutting metal and creating reliable welded joints. Inverter welding machine with a power of 160 Amps will allow you to easily weld thick metal rims.
Indispensable for cutting metal and cleaning seams angle grinder. It is recommended to have two wheels on hand: one cutting wheel for cutting, the other flap wheel for grinding. This will speed up the process and improve the appearance of the finished product.
As consumables, you will need electrodes with a diameter of 3-4 mm, preferably grades MP-3 or UONI-13/55. For doors and grates you will need a metal corner or fittings. Also, don’t forget about heat-resistant paint, which will protect the stove from corrosion.
☑️ Preparation for welding
Don't skimp on protective equipment. A “chameleon” welding mask and thick leggings will protect your eyes and hands from burns and ultraviolet radiation. Working with metal requires complete concentration and safety.
Furnace design and drawing
Classical disk oven consists of three main sections: the ash pit, the firebox and, optionally, the afterburner. The design resembles a vertical cylinder separated by a grate. This arrangement provides good traction and efficient fuel combustion.
At the bottom there is an ash pan where the ash falls. A grate is installed above it, on which firewood or coal is burned. The upper part serves as the main combustion chamber where heat is released. Sometimes a fourth disk is added on top to create a system for afterburning pyrolysis gases.
The doors of the firebox and ash pan must fit tightly to the body. To do this, rectangular holes are cut in the disks, and metal frames from the corner are welded along the edges. This allows the doors not to warp and ensures tightness.
Do you need a drawing for a simple stove?
The basic three-disc model does not require complex engineering drawings. It is enough to mark the cutting lines with chalk directly on the metal, maintaining symmetry. However, if you are planning a complex system with a water circuit or forced draft, a diagram on paper is required.
It is important to provide a place for connecting the chimney. The hole for the pipe is usually made in the upper disk or in the side wall of the upper section. The diameter of the hole must correspond to the diameter of the chimney pipe, usually 100-115 mm.
| Parameter | Meaning/Description | Note |
|---|---|---|
| Oven height | 60-90 cm | Depends on the number of disks |
| Firebox diameter | 35-40 cm | Standard R14-R15 |
| Wall thickness | 6-8 mm | Rim metal |
| Chimney diameter | 100-115 mm | Optimal traction |
Step-by-step assembly instructions
The assembly process begins with preparing the disks. If the drives have center caps, they must be removed. Then the disks are joined to each other. To begin with, they can be welded at several points to check the geometry.
The next step is cutting out the holes for the doors. Mark rectangles on the front side of the future firebox and ash pan. Carefully cut out the metal with a grinder, leaving small allowances if you plan to make frames.
After forming the body, proceed to installing the grate bars. As a grate, you can use thick fittings welded inside the furnace at the level of the junction of the lower and middle disks, or a ready-made cast iron grate. The gap between the rods should be 1-2 cm.
To improve traction and ease of cleaning, make the ash pan removable. To do this, the lower disk can not be tightly welded, but connected to the firebox through a clamp, or simply put the stove on its legs, leaving the bottom open for ventilation.
The final step is to weld the legs and handle to the doors. Legs can be made from scraps of pipes or corners, raising the stove above the floor by 10-15 cm. This will improve air circulation and protect the floor from overheating.
- 🔨 First make potholders, check verticality, then weld the seam completely.
- 🌬️ Don't forget to make air holes in the door of the ash pan (blower).
- 🚪 The firebox door should open smoothly and close tightly.
- 🔥 Carry out the first launch outdoors to allow the paint and oil to burn out.
Chimney installation and safety
Safe operation of the stove is impossible without properly installed chimney. The pipe must be of sufficient height to create natural draft. The minimum height of the pipe above the roof ridge is 0.5 meters if the stove is installed in a garage with an outlet to the outside.
When passing pipes through wooden structures or roofs, be sure to use thermal insulation. A metal box filled with expanded clay or basalt wool will protect the tree from fire. The temperature of the flue gases in such a furnace can reach 400-600 degrees.
Be sure to install a damper (damper) on the chimney. This will allow you to regulate the thrust and rate of fuel combustion. Without a damper, heat will escape into the chimney too quickly, and the stove will cool down in a matter of hours.
⚠️ Attention: It is strictly forbidden to use a stove without a working chimney in a closed room. Carbon monoxide is odorless and colorless, but deadly. Check the tightness of all chimney connections with soapy water or smoke before lighting.
Operation and Maintenance
A disc stove is easy to maintain, but requires regular cleaning. Ash from the ash pan is removed as it accumulates, but at least once a week during active use. Ash accumulation impairs draft and reduces combustion efficiency.
Once a season, check the condition of the welds and the integrity of the metal. High temperatures and heating-cooling cycles can cause microcracks. If through defects are detected, they must be welded immediately.
To extend the service life of the oven, it is recommended to coat it with heat-resistant paint. This will not only improve the appearance, but also protect the metal from corrosion, which inevitably occurs due to condensation when lighting a cold stove.
If the oven starts to smoke when the door is open, this is a sign of poor draft. Check the cleanliness of the chimney and the presence of snow or ice at the chimney head. Regular maintenance will ensure your garage stays warm and cozy for years to come.
The main secret to the longevity of a disk furnace is high-quality welds and regular cleaning of soot, which is also an excellent heat insulator and reduces efficiency.
Frequently asked questions (FAQ)
Is it possible to burn such a stove with coal?
Yes, the disc design is great for coal due to its thick walls. However, the grates must be strong enough to withstand the weight of the coal and the high combustion temperature. It is recommended to use cast iron grates.
How long does this oven take to heat?
One full load of firewood burns for about 1.5-2 hours, after which the stove cools down for another 2-3 hours, continuing to give off heat. Coal burns longer, up to 4-5 hours, providing a more consistent heat.
Is it necessary to line the firebox with bricks?
It is not necessary to do this in a disk oven, since the metal of the rim is quite thick. However, if you want to increase the cooling time, you can line the stove with fireclay bricks or make screens.
What pipe diameter is best to choose?
The optimal diameter for such a furnace is considered to be 110-120 mm. A pipe with a smaller diameter may not cope with the removal of flue gases, especially when using wet firewood, which will lead to reverse draft.