Arc oven in two flower pots. Scheme, description

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Arc oven in two flower pots. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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A small electric arc oven designed for experimental purposes can be made from two ceramic flower pots - one with a diameter of 5 cm, the other - 15..25 cm. Drill two holes one opposite the other just below the edge of the small flower pot (you can drill with a regular steel drill) . The holes should be of sufficient diameter for the carbon electrodes from the arc lamp.

Arc oven in two flower pots
Rice. 1. Small arc furnace in section

Plug the hole in the bottom of the large pot and fill it with sand up to the top of the small pot, press hard on the sand, pushing it about an inch deep into the large pot. Now drill a hole in the large pot at the same level as the small pot. Pass the rod through the three holes and mark where the rod rests on the other wall of the large pot. Make sure the rod is properly aligned and the small pot is properly centered. Drill a second hole in the large pot and thread the rod through it. Now fill the sand around the small pot almost to the level of the rod.

Fix the sand in this position by watering it a little. Coat the rod with fireclay all around in the space between the two pots, carefully and gently smearing the clay as close to both walls as possible. This will prevent the carbon rods from getting stuck in the sand, these rods should slide easily. Pour sand all the way to the top of the small pot and secure it with water. Pull out the rod and set the oven to dry. Furnace lids can be made from ceramic flower pot saucers.

Prepare the carbon electrodes by connecting a brass or copper clamp to them to ensure good electrical contact. Attach a piece of glass tube to one of the electrodes for adjustment, as shown in Figure 1. The other electrode must be held stationary during operation. The necessary ballast resistance can be made by dissolving a teaspoon of soda in 4,5 liters of water. This oven is connected through a 15 amp fuse, which is quite safe for home electrical wiring. Short-circuit the carbon electrodes to each other to start the arc.

When using an arc furnace, dark glasses must be worn. Do not touch the electrodes with bare hands. Do not use the above liquid resistance when it boils.

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