Re: isochronism

djohnson wrote: 
Frank Adam wrote:


That could well be due to an old mainspring.
While it is true that loss of power can cause a gain, that theory only
works until the power is still sufficent to drive through the train
and give the balance a resonable push.




All your causes would boil down to "not enough power to overcome
friction", and should show reduced amplitude, right?  My limited
experience is that amplitude over 180 degrees will probably work OK.
If it's less than 180, I clean and lube it. If it's less than about 90,
it's probably gaining a bunch, and is about to stop. Is there an
amplitude where the watch will lose, but continue to run?


bit more too it then just the amplitude, while a reduction of amplitude will normally cause the watch to gain, other factors as in weak mainspring, poor power transmission caused by wear in the plate holes which are not jewelled, the escapement can be just barely ticking over and still run.

other factors: if the balance is badly out of poise the watch can gain a lot in one position and lose by a similar amount in the opposite position.

anyway cannot really say what is the problem with that watch without seeing it, but more than likely a new mainspring and a service would fix the problem provided the plate wear is not too bad, just remember that with the exception of early Oris watches most pin pallet watches were never meant to be repaired or serviced, being so cheap it was simpler to replace the movement or the whole watch since the cases were mostly crap, timex did this all the time, I stil have a stack of spare parts for those BFG movements, mostly settings, stems, click springs etc, if the movement needed any more than that it would mean a swap.
.

Relevant Pages

  • Re: relays
    ... Using your definitions, a mechanical valve can have power gain, yes? ... Its power gain is infinite, because once you turn the valve, the water ... All of which indicates that the power gain of a latching relay is ...
    (sci.electronics.design)
  • Re: relays
    ... Using your definitions, a mechanical valve can have power gain, yes? ... Its power gain is infinite, because once you turn the valve, the water ... All of which indicates that the power gain of a latching relay is ...
    (sci.electronics.design)
  • Re: What a Parrot Brained Fuckwit
    ... >>>gain. ... A transformer is ... >> simply an impedance converter. ... >>>power gain, ...
    (rec.audio.pro)
  • Earth-Moon-Earth (EME) Communications -aka- Moon-Bounce -and- HAARP
    ... the issue is about the needed power. ... The lower you go in frequency, the harder it is to get much gain in antenna, ... A lot of moonbounce expects a reasonable gain antenna at the receiving end.. ... lots of signals from stations with no more than single yagi. ...
    (rec.radio.shortwave)
  • Re: calculating a link budget
    ... space loss + rx antenna gain - rx coax loss - fade margin ... max output power of 0dBm, ... A receiver sensitivity of -94dBm is at 250Kbits/sec. ...
    (sci.electronics.design)
Loading