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Cristian,
The gears are the same shaft as the roller that is being heated by the heater. The gears are heated by both radiation and conduction. Providing a heat shield would cut down on radiated heat, but the main source is conduction. I suppose that the mechanics could be changed to extend the shafts with thermally insulating material. That would place the motor/gear mechanism outside the case. I am not sure I could identify a thermally insulating material that would be stiff enough at that temperature to give the required operation. Metal gears would be much simpler.
Harvey
At 04:33 AM 21-12-16, you wrote:
>
>
>Rob,
>
>Since the recent posts on gears, I have been nosing around ebay
>looking for metal gears.
Why not isolate the plastic gear in a tin box and ventilate it with a
small fan?
Cristian