- posted 12 years ago
I was under the impression that two sheets of material were hot rolled
together and the discs just stamped out complete with the dome shape.
Bimetalic domes
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- posted 12 years ago
how about instead of removing material from the flat surface of the dome to
remove material around the outside diameter? would that alter the point at
which the dome went PING? i was just wondering if the outside edge is
constrained in a bezel, if there was more room to expand there if that would
alter it's temperature rating?
b.w.
b.w.
- posted 12 years ago
If there were room, one could add a preload spring to change the set point.
Mark Rand RTFM
Mark Rand RTFM
- posted 12 years ago
The use I see them is located fairly loosely in a well in a bakelite disc
that is itself located loosely in the bakelite outer housing
- posted 12 years ago
I might try that , will require adding a small well for the spring
- posted 12 years ago
I remember reading that the process used by the Mint for forming
tri-clad coins was invented (patented?) by the company that makes the
very good but outrageously expensive All-Clad cookware. I think that
their sucess at the coin process led them to introduce the cookware.
Joe
Joe
- posted 12 years ago
I wonder if one could paint the convex face with fingernail polish as
an etch resist and put the disc in an etching solution to thin the
concave side? Would the relatively smaller 'concave mass' shift the
trigger temperature upwards?
--Winston
--Winston
- posted 12 years ago
Heaven knows, I don't like reinventing the wheel, but unless you can find
documentation (such as a patent) that explains in detail how these devices
work, and how a particular temperature is set, you're going to have to
experiment.
I again recommend looking for one of those interchangeable thermostats. Perhaps ripping it apart will reveal the secret!
I again recommend looking for one of those interchangeable thermostats. Perhaps ripping it apart will reveal the secret!
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The Presto "Control Master" has been around at least 40 years, and Presto is
still making appliances that use it. (I don't know whether the internal
design or operating principles have changed. The probe part does appear to
be longer and narrower in the current version.)- posted 12 years ago
DuPont patented the process of explosion welding that was originally used
for the clad coins, but they stopped using the method somewhere along the
line and now use some sort of rolling method to do it.
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- posted 12 years ago
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Kaiser Steel figured out the original Aluminum to steel "welding" Was used
in the armor plating of tanks. Abrams I think. - posted 12 years ago
Armco steel, (Now A-K Steel) developed the aluminum clad stainless
steel used for catalytic converters. It was great for body work, too.
:)
- posted 12 years ago
I got to tour the Armco rolling mill in Middletown, OH when it opened. One
of the more impressive experiences. 50 ton block of steel goes into an oven
to get red hot and then sheared off in to manageable pieces. That
eventually are rolled out to very long sheets of steel. Those big rolls of
steel you see at times.
- posted 12 years ago
Wareever pot so it looks like - Might have been electro-spotted in a press.
Looks like some heat spots here and there and in a ring.
Martin
William Wix>> Explosive welding.
Martin
William Wix>> Explosive welding.
- posted 12 years ago
I have been waiting for someone to suggest that the temperature at
which they switch is controlled by how domed the discs are. At least
that is my guess. Suggest you get some rubber and a ballpein hammer.
Test what the temperature is that one switches at, and then make in a
bit more domed and see if that changed the temperature at which it
switches. My guess is that more domed means more change from ambient
temperature before it switches.
Dan
Dan
- posted 12 years ago
I have been waiting for someone to suggest that the temperature at
which they switch is controlled by how domed the discs are. At least
that is my guess. Suggest you get some rubber and a ballpein hammer.
Test what the temperature is that one switches at, and then make in a
bit more domed and see if that changed the temperature at which it
switches. My guess is that more domed means more change from ambient
temperature before it switches.
Dan
I will give it a go with large ballbearing in a cup and a press. But the full range of temp (10 to 220 deg C at least) switches all come in the same size package and the internal spaces and activation pins are the same dimensions including degree of doming, all that changes is the materials or construction within the domes. Normally open for the same temp normally closed is simply just the same dome in, the other way up
Dan
I will give it a go with large ballbearing in a cup and a press. But the full range of temp (10 to 220 deg C at least) switches all come in the same size package and the internal spaces and activation pins are the same dimensions including degree of doming, all that changes is the materials or construction within the domes. Normally open for the same temp normally closed is simply just the same dome in, the other way up
- posted 12 years ago
I lived near the 'Project 600' plant for 20+ years. The original
'rolling mill' was built in the late 1800s. 'Project 600' was its
replacement and the first computerized steel mill in the US. The air
was red with rust, until the old mill was decommissioned, years after
'Project 600' was in full operation. It was used to make specialty
steels, while 'Project 600' made steel for the big three auto companies
and several companies that built major appliances. It also made the
steel skin for their 'Armco Steel Buildings' division.
Early pilots used the red cloud as a navigation aid. Some days it could be spotted 100 miles away. The original plant had so much of that fine rust clinging to the inside walls and roof that part of the complex collapsed.
I had a friend who was their analytic chemist. He did all the stack sampling tests, as well as chemical testing of the various alloys. He got me a few pieces of aluminized stainless in the late '80s to repair the sliding doors on my stepvan. That stuff was hard to drill! :)
Early pilots used the red cloud as a navigation aid. Some days it could be spotted 100 miles away. The original plant had so much of that fine rust clinging to the inside walls and roof that part of the complex collapsed.
I had a friend who was their analytic chemist. He did all the stack sampling tests, as well as chemical testing of the various alloys. He got me a few pieces of aluminized stainless in the late '80s to repair the sliding doors on my stepvan. That stuff was hard to drill! :)
- posted 12 years ago
. My guess is that more domed means more change from ambient
Another thing to try is local heating and quenching in order to change
the distribution of internal stresses in the dome.
- posted 12 years ago
It's bimetal; I don't think you want any "unexpected" stresses.
Isaac
Isaac
- posted 12 years ago
I remember seeing a red cloud above some buildings. Was 1968 and I worked
for NCR in those days and wife and I went down to tour the plant when they
opened it to the public for the grand opening. Was in Dayton for a class.
Growing up 10 blocks from San Francisco bay, did not see a lot of rolling
mills here.
- posted 12 years ago
Pretty difficult to calibrate that change. I'd try mounting a small coil
spring so as to work with or against the direction of the snap. A setscrew
can then be used to modify the spring preload and adjust the snap point.
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