What you need for production
For making the stove, there is a need for a work space that is large enough to have a curing tank for the stove pieces, space to lay out the cured pieces and dry them, and a space to store raw materials, stove parts and tools.
The tools required to make the chulha are basic masonry tools and basic hand tools like pliers, hammers, screwdrivers, GI wire, chisel, etc.
Apart from this there should be an adequate amount of raw materials like cement, stone grit, wire mesh, and MS rods to make the required number of stoves.
Certain parts like the grate, chimney and chimney caps need to be ordered from suppliers as well.
How to cast the chulha
|Mixture of cement and stone grit is prepared with water to a semi dry mixture||Molds are applied with oil as a releasing agent.||Concrete mixture is filled in the molds and compacted with a ramming stick.|
|The process is repeated till the mold is filled||The filled mold is smoothened for good finishing||Molds are filled till the brim.|
|Cast parts are kept in the mold for 3-8 hours, depending on the mixture consistency and weather.|
|Filled molds are inverted on flat surfaces and left for 30 minutes||Unbolt and carefully release the cast parts.||Mold parts are separated|
Cast Parts Curing
|Cast parts kept for drying||Cast parts are cured under wet jute in areas without good sunlight||Cast parts are cured under water in dry areas|
How to ﬁnish the parts
When the cast parts have been released from the mold, excess cement should be removed with the help of a chisel or rasp. Otherwise this can create a problem when assembling the parts during installation. If wanted, the stove parts can be painted using exterior quality cement paint (e.g. brick red/terracotta) which is available in powder form in most hardware stores.
Excess cement should be taken off the parts with the help of a rasp or chisel as shown in image below
When releasing the cast pieces from the mold, do not hit the mold pieces or bang them against the floor.
After the casting is done the mold should be wiped clean and made free of any cement that might still be sticking to it. Wipe the mold with a lightly oiled cloth and store the pieces away from direct sunlight. Clean the nuts and bolts used to hold the mold pieces together thoroughly, and store them in a container with some oil to prevent rusting.
Tracking the number of stoves produced, amount of time taken for curing the stoves, dates when orders were placed and executed, etc. can be useful for build a good case for stove funding. This information can also be a valuable resource for stakeholders and can be included in this site as part of the Low Smoke Chulha knowledge base and case studies.
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