"Airy R. Bean" wrote in message
...
Was intended for alt.horology, a reference to pallet stones.

A most unconvincing attempt to cover up a major faux pas.

Your original post said:

"I wish to make a master oscillator for the shack, and am considering
cutting my own crystals in order to reduce ageing. Is there a source
of raw material?

Also, for temperature compensation, I am considering the use of bi-metals.
(I've never seen one, but what is the mechanism used in Oxley's
Tempatrimmer?)"


Let us examine this a little:

"make a master oscillator for the shack". Well that could be a construed as
referring to the 'balance wheel' in a clock (or watch) escapment but only by
a leap beyond the credible.

"own crystals in order to reduce ageing" The "crystals" used in the pallet
of an escapement are using usually synthethtic ruby and, while the changing
of their profile can contribute to a loss of accuracy, the 'ageing problem'
is wear on the escape wheel and, while this is related to the 'cut' of the
pallet stones, other aspects of the system accuracy determine the various
profiles in this area (in particular the need for the escape lever to
provide the impetus to the 'balance' wheel).

"I am considering the use of bi-metals." The escape mechanism in a clock (or
watch) is often temperature compensated but the mechanism is either on the
"balance" wheel (the radius is changed to vary the angular momentum) or the
balance spring (the tension being varied). Neither of these align with the
mechanism of a tempratrimmer.

As regards accuracy, the limits for a certified chronometer are -0 +5s per
day, if memory serves me correctly. There are far more practical ways to
achieve better than this without resorting to cutting pallet stones.

No Gareth, you were just trying to start another thread where you didn't
understand the topic. Having realised your error you are now trying to
divert the thread- as it happens into an area where your knowledge seems
equally challenged.