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Arnold Howard

Member Since 26 May 2010
Offline Last Active Feb 08 2016 03:04 PM
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Posts I've Made

In Topic: Kao Wool Question

01 December 2015 - 01:29 PM

Wrapping the kiln with insulation will cause the stainless steel case to overheat.

 

Arnold Howard

ahoward@paragonweb.com


In Topic: Not Being Able To See The Witness Cones

25 November 2015 - 09:15 AM

I recommend green #3 safety glasses (after testing a handful of safety glasses of different shades). Green #3 is dark yet light enough to enable you to see the firing chamber.

 

During a recent test firing, I pointed a bright LED flashlight into a kiln at around 1800F. (Someone else lifted the lid for me.) That flashlight is so bright that the rest of the kiln was dim by comparison. I haven't yet pointed the flashlight into a peephole. (The test kiln in my office is very small and doesn't have a peephole).

 

To get a wide view through the tapered peephole, you have to move your head from side to side. If you need to place the cones close to the peephole, put a bent cone on the shelf and position it where you can see the tip. Use that as a guide in positioning a straight cone. If the straight cone is too low, the tip will disappear when the cone bends.

 

Sincerely,

 

Arnold Howard

Paragon Industries, L.P., Mesquite, Texas USA ahoward@paragonweb.com / www.paragonweb.com


In Topic: Your Hugest "derp" Moment?

05 October 2015 - 08:32 AM

You're not alone. Surgeons write with a felt-tip marker on the limb to be operated on to make sure they work on the correct one. And I've heard of two other cases where a technician came out to work on a kiln, only to find that it was unplugged.

 

Arnold Howard


In Topic: What To Look For In A Used Kiln?

17 August 2015 - 10:57 AM

Last month I wrote an article on buying a used kiln:

 

http://www.paragonwe...ter.cfm?PID=456

 

Sincerely,

 

Arnold Howard

Paragon Industries, L.P., Mesquite, Texas USA

ahoward@paragonweb.com / www.paragonweb.com


In Topic: Kiln Lid Warping When Hot.

05 August 2015 - 12:54 PM

How much space it too much, when lid warps. Will flipping lid help. My lid sets pretty well when cold, but develops a lot of space when firing. I know some space is ok, but mine looks abnormal, over 1/4" in places. Is there a high temp blanket that would help with this?

The center of the lid bows slightly inward toward the firing chamber at high temperatures. This is because the outside lid surface is cooler than the inside surface. The expansion of the lid causes a slight gap between the lid and kiln body but not enough to affect the firing.

 

If the hinge does not allow the lid to float freely, the front of the lid can rise 1/4" - 1/2", causing heat loss. Placing a weight on the front of the lid can add stress to the firebricks. Instead, adjust the hinge so the lid has play that will allow it to float when the firebricks expand.

 

Sincerely,

 

Arnold Howard

Paragon Industries, L.P., Mesquite, Texas USA

ahoward@paragonweb.com / www.paragonweb.com