Most recipes for cakes etc. will say not to open the door or the baking will collapse.
You will not get a consistent temperature with the door open. Microwaves have rotating plates to avoid radiation hotspots. Ordinary ovens have fans to distribute the heat.
A rotating plate in an ordinary oven with an open door makes no sense.
I apologize, I forgot to say that the temperature was in Celsius, that was 180°C.
Anyway, I got it, it's too expensive doing this, if not impossible. I would better to buy a new oven. Thanks anyway.
ardly:
Is this a wind up?
Most recipes for cakes etc. will say not to open the door or the baking will collapse.
You will not get a consistent temperature with the door open. Microwaves have rotating plates to avoid radiation hotspots. Ordinary ovens have fans to distribute the heat.
A rotating plate in an ordinary oven with an open door makes no sense.
ardly, what do you mean with "wind up"?.
I don't speak english very well, let me explain better.
When I say that the oven's door is slightly opened, I mean it is opened for 0.5 / 1 cm, not totally opened. It is just enough to make the cable pass without rubbing against the oven's gasket. In this way the temperature tends to remain consistent.
Anyway, in pastry labs, there are professional ovens where you can control the amount of water steam coming out, because there is a little valve electrically controlled. When you make a "soft" cake (classic cakes, not something like Panettone, this is a bit more complicated to explain) you may want to open that valve so that the water steam gradually come out without pressing over the cake, and you get a very soft cake. Plus, in those ovens there is a rotating carriage which guarantees a perfect cooking. Of course they are very expensive.
You can "simulate" the valve mechanism in your domestic oven by opening the door -just a bit-, as I said above, with a little ball of tinfoil, or something not too big.
I've just asked if it was possible to implement the rotation with a motor.
Can you give the make and model of an oven that has a rotating carriage?
Looking at existing equipment may give ideas about how the problem can be solved.
Do you know why rotating carriages are used rather than just fans?
I have to say that putting the motor in the oven really does not sound like it would work. At 180C insulation is going to be melting. If you wanted to modify an existing oven you would probably have to drill a hole in it so that the motor was outside and only a drive shaft entered the oven.
TheMemberFormerlyKnownAsAWOL:
I don't know what the motor gets to, but the oven certainly has a turntable.
The motor is under the metal bottom of the oven. The metal is a shield from the RF. The OP will have to design a heat shield if his motor is inside the oven. I guess he could put the motor under the oven, with a heat shield, and run a shaft through a hole into the oven cavity.
Look at using spun ceramic material for a heat shield. I remember a demo at NASA in Houston that heated a hand held piece of spun ceramic using an OA torch until the heated part was red hot. No heat transferred to the other side. Same material used on the skin of the shuttle.
ardly:
Sorry for not taking you seriously at first.
Don't worry it's fine
ardly:
Can you give the make and model of an oven that has a rotating carriage?
Looking at existing equipment may give ideas about how the problem can be solved.
Yes sure, for example this one. These are professional ovens used in lab (they are gigantic ). Of course the rotating mechanism would be different because of sizes, but the concept it's the same.
ardly:
Do you know why rotating carriages are used rather than just fans?
They use both of them. The reason is that: in domestic oven there are fans to get a better distribution of heat, but it often happens that, even if you use fans in your oven, you get a part of your cake darker than the rest. This depends on the airflow inside the oven. You can reach a better result turning, every X minutes, your cake a little bit, but to do this you have to open the door and this makes the temperature to drop down. The rotating mechanism solve this problem.
ardly:
I have to say that putting the motor in the oven really does not sound like it would work. At 180C insulation is going to be melting. If you wanted to modify an existing oven you would probably have to drill a hole in it so that the motor was outside and only a drive shaft entered the oven.
I got it. I mean, it's an hard work that it's not worth doing. I will buy a new modern oven when I can.
Thank you.
I had never seen these before. They are big, very expensive and run on electricty, gas and even diesel!
To make a small oven there are three hurdles;
For control all you need is an Arduino controlling the speed of a DC motor.
Next you need a drive train between the DC motor and the rotating stand. This will require a gearbox either directly driving a shaft or, more likely, driving it via a metal chain. This requires the components plus a bit of fabrication so that everything is held in the correct position and so is starting to get complex.
The really hard bit is how do you make this turn the tray. Putting the motor inside the oven is a non-starter it will get cooked. I also think having the drive go through an open door really does not make sense. You will bake a better cake in a closed, fan assisted, oven without a rotating tray than one with a rotating tray but with the door open. This leaves a couple of choices; you could cut small holes to allow the chain to enter the oven or you could have everything outside the oven apart from the shaft which would enter either from the top or the bottom.
I did find a rotary (diesel!) oven, which used a motor on the outside top driving a shaft into the oven. I think most commercial ovens will take that approach so it is probably the way to go.
I did find pizzas ovens which do have open doors, but even they did not drive the rotation through the door they used a vertical shaft.
There are microwave ovens that include rotating plates and grills. However the grills are really there to brown meat. I do not think one could be adapted to bake a cake better than a fan assisted oven.
). Of course the rotating mechanism would be different because of sizes, but the concept it's the same.