Android beat rate app

[LittleWatchShop]

This is a pretty cool app for regulating clocks.

[RichardHarris123]

How do you know wht the frequency should be? 

[LittleWatchShop]

24 minutes ago, RichardHarris123 said:

How do you know wht the frequency should be? 

I have a document from Timetrax with lists of beat rates

[MikeEll]

1 hour ago, RichardHarris123 said:

How do you know wht the frequency should be? 

If you have access to the going train wheels, you can count the teeth and calculate exactly what the correct beat rate should be.

If you had, say, a center wheel (CW), a 4th wheel (4W), and an escape wheel (EW), you could use the following formula:

(CW teeth x 4W teeth x EW teeth x 2) / (4W pinion teeth x EW pinion teeth) = bph

Edited 22 hours ago by MikeEll

[LittleWatchShop]

6 minutes ago, MikeEll said:

If you have access to the going train wheels,

Every time I service a clock, I tell myself to do the count.  LOL, I never do.  Maybe the next one.

[MikeEll]

4 minutes ago, LittleWatchShop said:

Every time I service a clock, I tell myself to do the count.  LOL, I never do.  Maybe the next one.

Ha ha, me too.  Literally, every week.  It can be done with the wheels still in the plates, but is a little slower.  With the mainspring unwound, I remove the click, then add a pencil or fine Sharpie mark to one of the teeth on each wheel, then gently rotate the wheels, count the teeth and hope no one interrupts you.  It can sometimes help to mark every 10th tooth in case you lose count.  It's a very effective way to regulate the finished clock though, I use it all the time.  Much faster than tweaking the regulation once a day.

Interestingly, I had a Smiths clock in the other week that was racing after a service.  I used the formula to calculate the correct bph, tested it, and eventually figured out it had come in with the wrong pendulum or some other issue.  With the pendulum adjusted to its lowest position, it still couldn't achieve the correct rate.  The problem in the end was that the clock had an incorrect suspension spring that was too stiff.

Edited 22 hours ago by MikeEll

[LittleWatchShop]

Brilliant!!

[oldhippy]

In my day we had charts to go by, just as well as I was crap at maths. 

[Dell]

Again not something I do very often just doing torsion clocks ( usually) but the odd times I have done it I found it easier to take a picture of the wheels & pinions expand to count the teeth  , it’s much easier for me to do that at my age.

Dell