| The Breakroom > The Water Cooler |
| Spring Contest |
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| Stilldrillin:
--- Quote from: mosey on March 22, 2013, 08:37:26 PM ---Well, not to be picky, but astragals are mouldings that seal the meeting of 2 doors, covering the gap when they are closed. A muntin is the bar between 2 panes of glass or 2 panels. Mosey --- End quote --- Hi Mosey. Welcome to the Collective. :borg: Would you like to write a few words about yourself, in the Introductions section? :thumbup: David D |
| vtsteam:
--- Quote from: awemawson on March 23, 2013, 04:48:57 AM ---Vtsteam, are you planning to dry out your furnace lining somehow before doing a melt? I'd be wary of all that moisture. --- End quote --- Thanks for pointing that out, awemason --useful procedure to mention for anyone using a similar outdoor charcoal furnace. I always start my furnace with a small wood fire if it has been sitting for any length of time and let that burn down to coals before adding charcoal. The top is left open, and there is no blast air. Just a small open fire. The same process used to dry and fire the refractory after building (although that is for a much longer period, and ultimately much hotter). I pre-heat not only to drive out moisture, but to ease the expansion of the lining from cold to foundry heat. Also it's cheaper for me to start with wood -- I get some coals going in the bottom before adding the first layer of charcoal, and that works out well. Charcoal is added in stages, as the temperature is brought up. I find the heating up process is an ideal time to ram up my mold, so no time is lost to doing it this way. This particular foundry furnace is built of hard firebrick with sand/clay mortar so it's a little more resistant to moisture than a pure sand/clay lining is. But I'm treating it the same as I normally would with my former melter. Here's a picture of the lining being built: |
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