This is about as good advice as you will need to do the job...
Brian W
G'day Mate,
>Depending on the total size of your oven, a hairdryer may be enough to
>provide the heat required. If it's slightly larger, a fan heater can be
>adapted to suit. The fan heater may already have the required thermostat in
>the air inlet (or between the fan and the element) and on many models can be
>readily adjusted to suit the temperature range you desire by turning the
>fitted temperature knob.
>
>You would may want a metal duct to feed the warmed air to the oven, and
>recirculate the same air to the fan's inlet. A couple of baffles once the
>air enters your oven box could be easily designed in, or if the box is made
>a little larger, the fan heater may be simply placed on a shelf inside. >
>If you want to scale up the unit, it can be easily achieved by simply adding
>a couple more fan heaters. Even if their thermostats are not at exactly the
>same air temperature, they will still settle to a stable oven temperature
>after a suitable warmup time. If you drill a couple of holes in the top or
>the side, you can insert a thermometer into a range of different points to
>check the temperature at a number of locations. It may take a half an hour
>of playing with the knobs, but you will be able to achieve a very even
>temperature. The fan forced oven will also have a more even temperature
>gradient from one end of the box to the other compared to an old oven >element.
>
>I think I would add a smoke detector and not use it unattended! Firbeboard
>sheet is also cheaply available from your local hardware, and if you used a
>product like you would line the wall behind a fireplace with, it would allow
>for higher operating temperatures if later required for another project. >
>You can pick up the heaters brand new for less than a carton of beer in most
>larger villages!
>
>:
>Hope this helps,
>Peter
>
>> I'm looking to build an annealing oven for Acrylic / Perspex /
>> Plexiglas / PMMA. Nothing fancy just functional, I'm intending to use
>> MDF to create a box structure to which I will add a hinged door and
>> some heating elements. The annealing process is only to about 80C/175F
>> so I'm happy that the wood will do the job.
>>
>> I initially considered buying an old oven and ripping out the
>> elements/thermostat, however for safety reasons I'm not too keen to do
>> this (The parts are sure to be over powerful), hence I'm trying to
>> find a supplier for the heating elements/thermostat and controller. I
>> would happily receive any information anyone could give... even where >> to search.
>>
>> I am based in Europe; a supplier in the UK or France would be most >> suitable.
>>
>> Many Thanks
>> Grant
>