MATERIALS
Pan to catch molten wax. We use a cheap 17"× 12"× 3"
aluminum roasting pan but you can use almost
anything. Metal is preferable, and try to keep it 3"
deep or less.
Dimensional lumber, 8' lengths, one each of: 1× 1,
1× 2, 1× 8
Sheet metal, 50"× 36"
Shade cloth or screen, 19"× 14"
Drywall screws or #8 wood screws: 1½" and ¾"
or whatever you have on hand that will work
Sheet metal screws, self tapping, ¾"
Transparent plastic film, 27"× 24" Sold as
greenhouse plastic, this is typically 3mil or 6mil
polyethylene film. Rigid clear plastic will also
work but is more expensive.
Perlite or other lightweight insulation material
such as vermiculite, sawdust, rice hulls, wood ash,
or shredded paper
Staples
Silicone sealant
Black paint
TOOLS
Cordless drill and ¼" bit
Circular saw
Tinsnips
Scissors
Tape measure
Straightedge
Pen, pencil, or other marker
Hammer
Paintbrush
Staple gun
thickness + 2" of insulation). The inside
dimensions of our outer box measure
23"× 18"× 8". You can adjust your dimensions
according to materials on hand.
2. Build the inner heat chamber.
2a. Using tinsnips, carefully cut the 4 pieces
of sheet metal according to the diagram in
Figure A: one piece 14"× 39", 2 pieces 11"× 25",
and one piece 20"× 25".
2b. Bend the 14"× 39" piece according to the
diagram in Figure B: at 3" bend away from
you, at 10" bend toward you, at 29" toward
you, and at 36" away from you. You’re creating
a U shape with 3" wings, which constitutes 2
sides and the floor of the inner box (Figure C).
36"
3" 14"
Outer box
bottom
25"× 20"
10"
39"
× 14"
Sides
&floor Side Side
25"
× 11"
25"
× 11"
50"
39"
29"
36"
A
B
22" 7" 1" Cut away 25" 8" D
C
Bend
E
3" Cut away
11"
as shown in Figure D, measure in from the
right side and mark both 11" edges at 1", 7",
and 8". Draw vertical lines between these
marks. Mark the righthand 25" side at 3" and
22", and make corresponding marks on the
vertical 8" line, then draw lines between these
marks horizontally.
2d. Cut from the right along the horizontal
lines at 3" and 22" until they meet the line
at 8". Now cut from the 11" edges along the
7" line until you reach the slices you just cut.
Don’t discard these scrap pieces — you’ll use
them later. You now have a T-shaped piece
with small tabs. Repeat this procedure to
cut the second 11"× 25" piece of sheet metal
(Figure E).
2c. With an 11"× 25" piece oriented vertically, 2e. On each 11"× 25" piece, bend (toward you)
137 Follow us @make
