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How to do lost wax investment casting at home

In this video I set out to show that it´s perfectly possible to carry out lost wax investment casting with very basic equipment and using only readily available, low-cost materials.
  Here my wife and I use a charcoal-and-hairdryer furnace, beeswax and plaster from the builder´s merchant to cast a 20 cm (8") lizard from aluminium. This is my second attempt at investment casting and I do make mistakes.
  The main points are: 
Place sprues and vents in what will eventually be an inconspicuous position
Be vigilant; until the first coat of plaster has hardened, the wax model is vulnerable to distortion 
Delicate extremities are a challenge as they go unvented, yet to vent them would be to obliterate all the detail.
  If you use ordinary plaster of Paris you must be meticulous about cooking the moisture from the mould in the oven. A gradual gradient is what´s needed, both as you heat it and as you let it cool. It should stay in the oven throughout the cooling procedure.
 Allow a generous supply of metal at the top of the sprue and vents. It serves as a reservoir from which the casting will draw metal as it contracts. 
De-gassing the metal might have improved the quality of my casting. A little sodium or potassium chloride would certainly have been a good idea.
I might have done a better job of pouring had I been more sensible about the disposal of the dross and not stepped on it. Perhaps we might not have had to weld up the poorly-attached leg, as I slopped metal into the vent of the leg in question, perhaps causing the air bubble at the junction of the leg and the body.
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