[time-nuts] E1938 oven design

Attila Kinali attila at kinali.ch
Sun Jun 11 11:59:50 EDT 2017

On Thu, 8 Jun 2017 16:17:20 -0700
"Richard (Rick) Karlquist" <richard at karlquist.com> wrote:

> We were stuck under 1,000 for a long time
> using only face heaters.  I still remember the
> day that I rigged up the first crude rim header
> by winding a piece of magnet wire around the rim
> and holding it in place with 5 min epoxy.  I
> didn't know what else to try.  This seemed like
> a Hail Mary play at the time, until I
> measured the gain.  We instantly went to gains
> above 20,000.  It seemed high at the time but
> it was only the beginning.
> The exact insulation is relatively unimportant.
> We even tried still air using a knife edge
> cradle.  Didn't make much difference.

What is a knife edge cradle?

One big question remains: How did you set the ratio
between face and rim heater? Was it determined at design
time and then just set the same for all units or was
it part of the production test?

			Attila Kinali
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
                 -- Miss Matheson, The Diamond Age, Neil Stephenson

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