On 2008-08-17, Joseph Gwinn wrote:
In article ,
"DoN. Nichols" wrote:
On 2008-08-16, Joseph Gwinn wrote:
[ ... ]
The Omega.com website has lots of information as well. As does NIST.
And somewhere I have a ton of literature from Omega -- but I
haven't seen it for a while. :-)
It's also on their website.
Of course -- but I don't actually *need* that information at
present, and I have lots of places to find it when I do.
[ ... ]
The Vigor had a neon pilot connected across the heating element, and so
I left it as it was.
O.K. But neon pilots -- especially after they age quite a bit,
tend to flicker on their own. Of course, if you *really* need to know,
you use the tiny LED in the controller. :-)
This neon does not flicker, although it seems to be original.
Amazing.
[ ... ]
I think one can buy pyrometers on eBay and at ham swap meets. There are
now lots of Pyrometers on the dole, having been made redundant by
digital controllers.
:-)
"On the dole" -- are you in the UK by any chance? Or from
there?
Neither. But I like their turn of phrase.
O.K. I can understand that.
[ ... ]
I thought of this, but couldn't find an 115 volt AC fans that were small
enough. I probably can run a 24 volt fan off the controller signal to
the SSR, but the fan would run only when the element was on. Perhaps
that's enough.
Hmm ... a tiny switching power supply from a hamfest to power
it?
I suppose, but we'll see if it's needed.
O.K. Perhaps just a 12V fan and a wall wart to power it? :-)
[ ... ]
Mine is too hard to get to at night. Easier when I can open the
shop door -- as I intend it to be when I'm using the oven. And a good
fire extinguisher handy, too. :-)
O.K. It is still daylight now, and I just checked. It is the
Omega "CN9000A". (IIRC, there is more fine detail to the number on a
label inside the box.
It's twice the size of the CN7500 series, but would nonetheless fit in
the Vigor where I mounted the CN7500. Aside from a larger and more
convenient front panel, and more control functions, the controllers seem
more or less equivalent.
O.K.
[ ... ]
O.K. But I *had* the machinable lava. It machines quite easily
in the lathe (very dusty), and when it is fired it turns pink and *very*
hard.
What make and model is this material? It may be useful.
Well ... I just did a Google search for "machinable lava", and
the first hit is:
http://www.professionalplastics.com/LAVA
(they insist on JavaScript being enabled) which says (in part):
I googled too, and had many hits, but didn't know which one you had.
machinable lava
was my search string.
================================================== ====================
Machinable Alumina Silicate L911A (Lava) Machinable Alumina Silicate
L911A (Lava) Aluminum silicate is machinable in an unfired state and
used in applications up to 1000 F After firing, parts are as hard as
carbide & usable up to 2100 F Aluminum silicate has low thermal
expansion Aluminum silicate is low cost Aluminum silicate is available
in wide range of stock up to 12" in diameter.
Some applications include prototype hardware, insulators, bushings,
soldering fixtures, nozzles, welding tips or whatever you need.
================================================== ====================
This site http://www.technicalproductsinc.com/lava.htm seems
to have more details about how it should be fired, and I obviously did
not do it quite right. :-)
I'll look into this. I recall that MSC sells the stuff, but it's
expensive.
It helps that I have some of it already. :-)
[ ... ]
Omega sells the #14 Type K thermocouples for something like $20 each, so
I wasn't tempted to scrounge for one.
Well ... I already had them, so I did not need to purchase any, yet.
I did purchase what will eventually replace what came with the furnace.
O.K. I already had some nice unused stainless steel clad type K
thermocouples -- still got a spare for when this one gets cooked to
death. :-)
Enjoy,
DoN.
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