Marcia Selsor on wed 4 feb 98
Dear Ellen, Vince, Marshall, et al,
I mentioned the springs and arches last year over this topic. The springs
don't get hot because the threaded rods are high up, over the arch. While the
frame to support the arch is still in place, the arch can be lifted and/or
adjusted to fit that last keystone into place. It's the only way I have ever
built arches. The arch can also be tightened if after time, you need to do
that. Car valve springs are made to tolerate heat in an engine anyway. The
springs allow the arch to expand and contract during the firing.
Marcia in Montana
Orion/Baker wrote:
>
> threaded rods is perhaps easier (and definitely more adjustable) than
> welding a fixed frame. Incorporating springs, as Marshall suggested, may
> work well -- though I've never been around one of those (is heat hard on
> spring steel? maybe not!).
>
>
> Best regards, as always,
>
> Ellen Baker - Glacier, WA
> orion@telcomplus.net
>
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