![watch timegrapher just dots watch timegrapher just dots](http://watchesofwestminster.co.uk/wp-content/uploads/2018/09/P1160003.jpg)
The cyclops looks to be positioned too far to the right, and, it is "slightly" high.ģ) timegrapher results are at the bottom of my expectations.
![watch timegrapher just dots watch timegrapher just dots](https://i.pinimg.com/originals/88/0e/cb/880ecb799b58d6b727edbf993d5ca9cc.jpg)
I am noob here, and have yet to purchase a replica.ġ) rehaut looks too small for the model (you can see that it is not a close fit, and there is a noticeable "gap"Ģ). I'm not expecting an instant diagnosis but this pattern may suggest something obvious to forum members.Hi. There are five ticks, a missed beat, five ticks, a missed beat etc before the Timegrapher cuts out and starts a new test.Īnd yet it keeps good time over 24 hours and more. I'm now wondering, with regard to 'natural escapement errors, if there is another reason, as the 'tick' sounds are not continuous. As the working range is 0-9.9ms of beat error, I assumed that this watch had an error over 9.9ms. The Timegrapher records a beat rate of 14400, but displays only scattered dots and cuts out before showing the beat error, the amplitude or the rate. My confusion about beat error not affecting timing (which I had read elsewhere) came about when I tested my grandfather's pocket watch of 1888 which had been repaired - at some expense! - and which keeps very good time.
![watch timegrapher just dots watch timegrapher just dots](https://www.watchclub.com/upload/watches/originali/watch-club-rolex-datejust-black-mother-of-pearl-ref-116231-year-2010-13886-5.jpg)
The reason I ask about beat error is that I bought a Timegrapher recently to check several pocket watch movements I have which work - work in the sense that they wind up, the balance wheel continues to oscillate and the hands turn. I take from this that the suggestion - 'there is no relationship between beat error and time-keeping' - is therefore not true. You write: 'If the balance spring is still winding when it should be unwinding (beat error) after theīalance has passed the neutral point, it will impact timing.'Īnd also, 'A beat error of under 1 millisecond has no measurable impact on timing,' which you recall above. I have now read your explanation of 'Natural errors of the lever escapement' in your work, and all is becoming much clearer. This introduces an excessive natural escapement error. The balance spring is either winding or unwinding depending upon which way the collet is biased. To square the circle, if the watch is out of beat, this means at impulse (when the pallet slot hits the impulse jewel) the balance spring is not at its neutral force. Impulse after the dead point (the impulse jewel at rest in a properly set up escapement) will result in a loss as well. The winding and unwinding of the balance spring is but one such natural error as is the draw of the pallets that help with secure lock. These are all explained by high school physics and are not rocket science. I suspect this work is the foundation for modern horological theory.įor completeness, natural errors in the lever escapement yield a net loss in rate. If you have access to the Gibri book from 1904 he covers it as well. I also cover natural escapement errors here: Adjustment.pdf This is all explained in Jendritski under natural escapement errors. Why does it matter? It impacts total amplitude and rate stability. I just think in decimals because I make sure beat error is always under 1ms (at least that is the story I am sticking with) Simply correcting the beat error was enough to stop the movement from rebanking.Ĭlick to expand.Oops. In this scenario the average amplitude wasn't enough to cause rebanking, but the amplitude in one direction was. Right after service and first measurements on the timing machine showed a higher beat error - around 3 ms, and rebanking at 305 degrees of measured amplitude. There is no adjustable stud carrier on this watch, so the collet has to be turned to adjust beat error. When the beat error is higher, the greater amplitude in one direction can cause the impulse pin to travel far enough around to contact the outside of the fork horn, and this initiates the cycle of rebanking. Keep in mind amplitude is a value that is displayed on most timing machines as an average of the amplitude in each direction. 321 I'm working on right now that had quite high amplitude, and this caliber will rebank in the 310 to 315 degrees of amplitude area when the beat error is low. Keeping the beat error low can help in particular when a movement has a high enough amplitude to potentially cause rebanking. The most common maximum I see for beat error is given as 0.8 ms maximum. Click to expand.Most factory tolerances are not that tight.