In article nc,
"Paul Hovnanian P.E." wrote:

N_Cook wrote:

As used in thermal switches. Instead of in form of a bimetal strip and
continuous curving with temperature, these are 0.5 inch diameter and make
a definite flip from concave to convex at a specific temperature. About
1mm of abrupt movement gives a very positive transition for the switch
contacts. Would it be possible to change the characteristic temperature by
grinding back a spot/ring/radii? on one face? which face? or would it just
destroy the action/activation force?

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.

If you load it to pop in one direction, then it may be so loaded that it
won't be able to pop back...

Isaac

isw wrote:

In article nc,
"Paul Hovnanian P.E." wrote:

N_Cook wrote:

As used in thermal switches. Instead of in form of a bimetal strip and
continuous curving with temperature, these are 0.5 inch diameter and make
a definite flip from concave to convex at a specific temperature. About
1mm of abrupt movement gives a very positive transition for the switch
contacts. Would it be possible to change the characteristic temperature by
grinding back a spot/ring/radii? on one face? which face? or would it just
destroy the action/activation force?

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.

If you load it to pop in one direction, then it may be so loaded that it
won't be able to pop back...


That's why they vary the ratio of the two metals when they design the
things. They don't make something, then half ass it till it almost
works.


--
The movie 'Deliverance' isn't a documentary!