Nice one! I should start building mines! Haha.
Wonderful design and idea. So proud of you! : )
For everyone else,
In regards to MAKING an auto turner, the turner might not be the issue but how are you going about to "making" the egg racks? It has to be the right shape, size, etc. It can't be wood because wood might have "hot spots" gained from the heat and thus, be over what your thermometer might read out...
If you have to end up using the egg racks...mind as well just buy the whole thing already...know what I mean?
My husband just made me a complete set of racks and used the turner frame I already had..mine had some missing. Took about an hour to do them all and was free...we build and have all kinds of fun stuff around.Wood can breed bacteria which isn't good in an incubator so we used PVC . It works great so now when we finish my big cabinet(he loves me lots and likes chickens to) he knows how to do my turners cheap.
Either motor will respond to changes in the dc voltage, but only to a point. To much or to little will result in burning out the little electric motor. You can also use a pulse wave modulator that runs the correct voltage but sends it out in pulses so as to not harm the motor, but will reduce/increase the speed at which it turns.