Step 1: Materials
What I used:
- A circular saw and its guiding rail
- A glass cutter
- A jigsaw (with metal cutting blade)
- A compact drill
- A grinder
- 8 mm thick plywood
- 18 mm thick plywood
- glass pane from a picture frame
- Glass or arcylic or stainless steel mirror
- Silicone caulk
- Metal bars
- 2*4 or other wood pieces
- A length of seal (strip seal for doors)
- High termerature black spray paint
Step 2: Choosing the dimensions
I believe my box is cubic and roughly 35 cm and my reflectors 65 cm long.
Step 3: Making the box
Step 4: Making the reflectors
So 4 were rectangular: the width of the box and the lenght I had chosen (65 cm)
The 4 other were triangular: They are the same length than the rectangular but the width of the base had to be calculated
To calculate the width, the math come to the rescue:
We first calculate the dimensions of the dotted length (see diagram on 2nd picture!). Now that we have the angle (ß) at which our reflectors will be tilted (step 2) we can determine this dotted length using the cosine function:
dotted length = Cos(68°) * 66 = 24.7 cm
Base of triangle = 35 cm
(If this is not clear, go ahead and ask your question in the comment section)
Step 5: Making the reflector cone
Step 6: Adding the mirrored surface to the reflectors
Step 7: Praparing the box for the reflector cone
The bars were bent using my manly muscles!
Step 8: Making the rotating food tray
Step 9: Making the glass door
To secure the glass to the box I didn't use any hinges, I just used pins at all four corners.
Step 10: Mods and tweaks
Using a progam called Crocodile Physics I saw why it was probably better with the mirrors inside: all the solar radiation is redirected towards the cooking pot (more simply, the food), heating it faster.
Step 11: It's time for solar cooking now!
If you have any questions, don't be afraid to ask!