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Showing results for tags 'coil'.
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Hi all, I'm planning on building a hobby kiln for my partner, and am in the process of choosing refractory materials and kanthal wire for the heating element. Was hoping I could get some advice from anybody who knows about these things. I want the kiln to be light weight and very efficient. I'd like to use ceramic fibre board as an inner layer of insulation (rated to 1400 C / 2550 F), and calcium silicate board as a secondary layer (rated to 1000 C / 1830 F). The ceramic fibre board is very expensive compared to the calcium silicate board, but i can't only use the calcium silicate board as it's only rated to 1000 C / 1830 F. So my idea is to cement the two boards together, with the calcium silicate board on the outside, so that it won't exceed 1000 C / 1830 F. I'm wondering how thick the ceramic fibre board needs to be such that the calcium silicate doesn't reach that temperature. We'll be firing the kiln to about 1280 C / 2340 F. My other question is about kanthal wire for the heating elements. I'm wondering what gauge of wire I need. The kiln will be about 40 litres / 1.3 cubic feet. I want it to get up to 1280 C / 2340 F. Based on similar designs that I've seen online, it looks like I'd need it run at about 3600 watts. I'm wondering what gauge kanthal wire I should use for a well-insulated kiln that meets these specs. If anyone has any idea about either of these questions I'd really appreciate your thoughts! P.S. I'm aware of the health risks of working with fibreboard, and will be using the proper PPE and precautions.
Hello, newbie here! Not too long ago, I decided I wanted to make a sculpture for my public library as a part of a Christmas decoration. I have my wooden dowel skeleton fixed up, putting it at 1'-2', and I'm using air dry clay. Problem is that it has been a while since I last used clay, and I don't know where to start WRT applying the clay on the skeleton. I tried putting slabs on it but it was too chunky on the legs and when I got up to the torso, it kept tilting over until it just broke off completely. Now, I added more dowels to the legs and spine, and will be adding more for the torso and violin, but I also need some tips on how to apply the clay, such as: Is it best to bulk it with foil or cotton balls and tape instead of clay? Which sculpting method is best? And should I do more than one? Which parts should I use coiled clay, and which parts should I use slab clay and pinch clay? Is this something I should do in parts for each day, or is there a different timely process? Thank you for the help!