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Burnout furnace: make or buy


#1

Hi, I am not very technical with electrics (but not completely
incompetent either - and I know some people who can check what I do)
and am trying to decide whether to make or buy a furnace for wax
burnout/investment firing. The benefit of making is cost (ie MUCH
lower here in the UK) versus downside of risk of death/explosion
(although I’d hope that risk isn’t too high!).

What is the general advice … make or buy ?

thanks
Keith


#2

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.


#3

Keith

Check out used pottery kilns via whatever route you can, ebay is
one. I got mine free in return for some IT work (play really).

But NOT a top loader - you only open one of those at 550 deg C once!

Andy Parker, Agate House Lapidary
Ulverston, Cumbria, England
@Andy_Parker
www.agatehouse.co.uk
Tel: 01229 584023