Poising a balance

[clockboy]

Found this video on YouTube. This is how a professional poises a balance wheel to a very high degree of accuracy. Most large variations when regulating a watch in different positions is normally caused by the hairspring or the poise of the balance wheel.

 

[praezis]

2 hours ago, clockboy said:

This is how a professional poises a balance wheel to a very high degree of accuracy

Please replace "a professional" by "this person". 

What he doesn't know or doesn't tell: often you can find a slight out-of-poise on the poising tool that is intentional. Why? Because you do not take into account the influence of the hairspring then. 

His luck is that he has a balance with Breguet hairspring, that is poised itself. Else his method would work more poorly.

My poising tool stays in the drawer and is used for coarse adjustments only -  I use dynamic poising. No more dangerous removing and mounting of the hairspring. Additional I use PCTM instead of pen and paper: it tells automatically magnitude and  exact location of the heavy point. And I do not have to remember all the rules of dynamic poising then.

Frank 

[Neverenoughwatches]

3 hours ago, clockboy said:

Found this video on YouTube. This is how a professional poises a balance wheel to a very high degree of accuracy. Most large variations when regulating a watch in different positions is normally caused by the hairspring or the poise of the balance wheel.

 

As Frank states, static poising is to get it in the park, where as dynamic poising takes more factors into consideration by poising the balance as a whole while it is in its working environment . Its not actually that difficult to get your head around how to do it.

[praezis]

One more note, a hint from pro to "pro":

With such a dented pivot there are other tasks to do than poising. Maybe this pivot is the real reason of an astonishing high poise error of a Rolex.

[Neverenoughwatches]

1 hour ago, praezis said:

One more note, a hint from pro to "pro":

With such a dented pivot there are other tasks to do than poising. Maybe this pivot is the real reason of an astonishing high poise error of a Rolex.

The amplitudes were different for each poise check . One low and one high, granted both equally either side of 220 ° . 57 ° below and 64° above.  I wonder if that was pure luck ?