The British Horological Institute Limited
Watch & Clock Train Calculator
Notes on use
Calculation from gear train
- Click No 4th Wheel if appropriate
- Enter numbers of teeth on each wheel and pinion using the keypad to enter the values (CE
= Clear Entry if you go wrong) and one of column of buttons beside the wheel
windows to load the value into the window. Representative values for a watch are loaded
initially as an example.
- Click on Calc f'm Gears
- Calculator will provide values for Vibrations per second, per hour, per minute and
pendulum length (interesting, but not much use, in the case of a watch!)
- Calculator also provides revolutions / minute of the 4th wheel (if there is one) - a
value of "1" means, of course, that a second hand may then be driven directly.
Calculation from Vibrations per Minute
- This function is provided to provide information for missing wheels or pinions.
- Put a value of Zero in only one of the wheel or pinion data windows
- Put representative numbers in all the other wheel and pinion windows, including the
fourth wheel and pinion if appropriate
- Enter the value for Vibrations per Minute using Keypad and load it into the calculator
by clicking Calc from v/m
- If the right vibration / minute figure is already in its window just click Calc from
v/m
- Non-integer values for numbers of teeth are obviously a nonesense but this indicates
more work is required
Calculation from Pendulum Length
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BHI Shop including 'BHI 150' & '151' Tourbillons
