There is a small book that you can get that tells you haw to make
a number of things that is used in casting and one of them is a
small furnace for dewaxing. The design of this would give you a
starting point put as someone has pointed out unless you can get
materials at a very low cost it may not be worth it.
The book is called :-
Handbook of Lost Wax or Investment Casting
by James E. Sopcak
pub by Gem Guides Book Co
Pico Rivera. CA 90660
Could we worth having on your bookshelf.
Hope it is of some help. Best wishes.
Major Boyce @pyramid
The greatest pleasure in life is doing what people say you cannot do.
EVERYBODY has a talent. What is rare is the courage to follow that talent to
the dark place where it leads.