Thank you both very much,
--- On Thu, 5/14/09, Rick Sparber <rgsparber@...> wrote:
From: Rick Sparber <rgsparber@...>
Subject: RE: [hobbicast] Re: furnace cavity & crucible size
Date: Thursday, May 14, 2009, 1:39 PM
I second LL's comments. Start with the crucible, make or buy the
liftout shank, use them to size the diameter of the furnace chamber.
Then work from the inside out to get the OD.
Another reason to have extra room above the crucible is to allow scrap
to be added to the melt and get the lid back on.
From: email@example.com [mailto:firstname.lastname@example.org] On
Behalf Of Lyle
Sent: Thursday, May 14, 2009 6:35 AM
Subject: [hobbicast] Re: furnace cavity & crucible size
You want enough free space around the crucible to be able to fit your
liftout shank around it. And usually the free space (all the way
around) is about the same size as the burner diameter. You want some
room above the crucible between the top of the crucible and the lid.
if it's too close you'll get some swirling in your melt which isn't
good. At least a few inches. Have your burner enter at the same height
at the top of the plinth (bottom of crucible) My biggest mistake when
building homemade furnaces is to not having enough room above the
crucible. I've seem this problem on some of the commerical ones too.
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