[Jewelry making - Article 00011] - Re: [Orchid] Burnout furnace: make or buy

[Ed Wales]

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    Yes with a little common curtesy to the rules of electrical safety,
    a home made kiln should be safe. 

    Electricity, can not blow up! No way! It can of course spark a fire,
    or cause an overheating fire. 

    Heat and drying over time is the practical danger.  Generally,
    unless properly [i.e. heavily] you need to have 12" to 36" free air
    space clearance on all sides of your kiln. A crude rule of thumb is
    if you can't hold your hand on any surrounding surface [vertical of
    horizontal] it's over heating the kilns surrounding area.  The
    danger of too hot a surface is in the cumlative drying effect,
    people misinstall wood heat equiptment and it can take 3 to 6+ years
    till the house burns down due to the misinstalation. A sheet metal
    shield is only effective if it has 1 inch of free air space, [the
    sheet metal having the inch clearance on all 4 edges and both
    surfaces] and that only reduces rated clearances by 1/2 to 1/3. 

    My purchased kiln [primarily for] glass fusing [Paragon SC-2] is a
    high effiecency unit that stays hand holdable on the exterior even
    throughout a 1500 F degree, 12 hr. cycle. But I spot check
    surrounding clearance areas every firing cycle, I love fire and
    flames, but only in her proper, safe place. 

    So, yes I have and will again use my own kilns for special sized
    works, I will ere on the side of fire safety every firing cycle, I
    like a professionally designed unit every time circumstances allow. 
    I don't want a visit by the fire squad, ever. 

Ed,
May firemen get very bored.

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