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Fireblade,
I had planned on installing a electric motor on the outside and running the shaft inside and then mounting the blade on the shaft. This would allow the use of a fairly in exspensive motor and with some type of reistat to control fan speed. I read somewhere on the commercial sights that they cycle the air through at 10 times the volume per minute. This seems awfully over kill? BUt with the reistat it will be easy to adjust.
What did you build your oven out of? how thick are the walls and how much insulation did you use in the walls.
I was worried about the elements possibly being to close to the part at some point so we had drawn into our plan to mount the elements to the side ( one element every two feet) and then place a piece of sheet metal over them to diffuse the burners direct heat from radiating directly on two the part. Basically a air gap. Our theory is that this would get the heat rising up the side of the oven and then with ducting and or fan we could force the air back to the bottom of the oven thus allowing a convection cycle and hopefully a very even heat through out the entire cavity of the oven.
my plan is to make slots to slide a divider wall in at every two feet section to allow for heating of only the space that the part takes up and then to place a switch on every element so that I can shut down any section i am not using. also the section of oven not being used will have vent doors that can be closed to allow the ducted heat to by pass the unused section of oven.
I am assuming that the oven temp regulator will be accurate enough? Have checked the unit in my oven and verifyed it to be very accurate at all temps.
I have a friend that builds carbon fiber resin airplane propellars and he uses a heat controller that allows his oven to operate at + or _ tenths of degrees but he still uses oven elements.
Quik note for a oven they use what looks like a insulation styro foam stiff board about three or four inches thick that is glued together and set over the molds after they are injected and then plugged in and the timers are set for the cycle which I believe is 325 or 375 for about an hour. These ovens are light weight and they use a electric carving knife to build them if they run into a need for a special shape. The ovens have no bottom in them and set on the concrete floor with the molds centered in them.
Have you heard of any powder coaters using this type of material?
Thanks for the info
Jeff