In article <j4js0t+p6p8@eGroups.com>,
confed2001 <confed2001@yahoo.com> wrote:
> It works & I have been using it for several years, but despite what the
> plans say it does not get hot enough to melt copper much less brass. I
> constructed the controller as described in the plans, and am using the
> heating elements stated, but aluminum is the best I can get out of it.
> If this controller will raise the temp of a small electric foundry than
> I need to get one.
I've not seen these particular plans but there are only two things that
govern the achievable temperature of a furnace. 1) energy input 2) energy
loss. The first is controlled by the resistance of the elements and the
available voltage, the second by how well you insulate your furnace. For
maximum energy input your controller must place no restriction on the
current supplied.
A simple way of testing the maximum achievable temperature is to bypass
your controller and feed full supply voltage to your elements. This will
tell you whether you need to look at improving 1, and 2 and whether there
is a possible fault with your controller
If you can get to the temperature you want with the controller bypassed,
you have a faulty controller, if not you need to look at points 1 and 2
--
Stuart Winsor
http://groups.yahoo.com/group/gingery_machines/app/peoplemap/view/map
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