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Mailbox Annealer
Glass annealing oven made from a #2 rural mailbox.
Date(s): May 3, 2005. Album by Tony Greer. Photos by aka: Glowboy. 1 - 12 of 12 Total. 4425 Visits.
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Great job, Tony! Thanks for sharing. Now I know how to use that Fiber Frax I got two years ago!
 - Dana, Tue, 3 May 2005 7:11AM
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Mailbox Annealing Oven
Glass annealing oven made from a #2 rural mailbox, as suggested by Mark Wilson of Glassblowing Topics.

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Heating Element
Five soft fire bricks are notched out to allow a 2400 Watt heating element to be surrounded on five sides.

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Heating Element
Heating element operates off of 240 Volts at 10 Amps, and fits into a slot in the front brick and holes in the back brick. Steel pins hold end pieces in place.

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Box and Liner
The angle brackets along each side of the box hold the fire brick in place. A piece of 22 Ga. sheet steel is used for the oven liner.

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Element Assembly
The heating element assembly ready to slide in between the side brackets. The liner is also held in place by these brackets.

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Marinite Shelf
A piece of 3/4" Marinite board is placed 1 1/8" above the fire brick to form the floor of the oven.

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Back Fire Brick
Soft fire brick lines the back end of the mailbox.

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Marinite Back
The back is covered in 3/4" Marinite to provide a heat proof non-conducting board to mount the electrical connections on.

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Fiber-Frax Insulation
The Fiber-Frax is in place and tucks in between the brackets and sides of the box. Marinite board mounted on door.

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Liner and Heating Package
The steel liner is snapped into place and the heating package is slid between the side rails. Holes in liner and box are for thermocouples and tubulation from plasma sculptures to exit the box.

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Floor In Place
There is 1/2" clearence along each side of the Marinite floor to allow heat from the element to enter the oven. Nichrome wire holds fire bricks in back.

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Initial Test Run
Thermocouples can be placed at three different locations. One thermocouple goes to the temp controller, and the other to a pyrometer.

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