RODALCO
Well-Known Member
agent420 Interesting link re the maths for a pendulum.
I knew the 2 * Pi * SqRt( L/G) formula which works out as near 1 metre for a clock with a one second beat.
markelectro
Better to have the pendulum rod a little longer than one metre than too short.
The distance is measured from the suspension spring to about halfway in the pendulum bob. I would go for a 1.10 metre Invar rod with enough thread at the end to allowe for fine adjustment.
The Hipp Toggle works on the attraction method and is very simple and minimises interference with the pendulum.
It only closes the contact when the pendulum arc decreases enough to engage the v shaped pawl, to fall in the v shaped notch and close the contact briefly, energise the coils, attract the pendulum and keep it going for the next 20 swings or so.
The Favag minute wheel rotates every 2 minutes, has 2 contact pins, one for positive impulse, one for negative impulse, for a full turn and is driven via a ratchet system from the top of the pendulum rod. I can take a few more photo's if you are interested.
The Favag is designed for the European master slave clock systems, which usually run on 12 or 24 volts dc, with 1 minute impulses, and changing polarity every minute.
My Favag runs within ± 2 seconds per week, which is very accurate.
A solid wall is important too for mounting a masterclock, and not exposed in direct sunlight to avoid excessive temperature changes.
The French Electrique Brillié system uses the alternating polarity system with changing polarity every 30 seconds, for a 1.5 Volts dc supply to the clocks.
In case of the English 30 seconds single impulse slave clocks the minute wheel may be a 30 seconds wheel with 15 cogs and 1 contact pin, or a one minute wheel with 30 cogs and 2 contact pins.
I have a Favag booklet somewhere in my archives and see if can find exact distances are for the position of the Hipp Toggle in comparison to the pendulum rod.
For the 2/3 seconds beat i can measure it for you, but you are designing it for a one seconds beat, so i assume it will be within proportion, distance wise.
If you are in the building stage and get excessive swing you can always reduce the voltage applied to the driving coil by inserting a resistance in series.
Regards, Raymond
I knew the 2 * Pi * SqRt( L/G) formula which works out as near 1 metre for a clock with a one second beat.
markelectro
Better to have the pendulum rod a little longer than one metre than too short.
The distance is measured from the suspension spring to about halfway in the pendulum bob. I would go for a 1.10 metre Invar rod with enough thread at the end to allowe for fine adjustment.
The Hipp Toggle works on the attraction method and is very simple and minimises interference with the pendulum.
It only closes the contact when the pendulum arc decreases enough to engage the v shaped pawl, to fall in the v shaped notch and close the contact briefly, energise the coils, attract the pendulum and keep it going for the next 20 swings or so.
The Favag minute wheel rotates every 2 minutes, has 2 contact pins, one for positive impulse, one for negative impulse, for a full turn and is driven via a ratchet system from the top of the pendulum rod. I can take a few more photo's if you are interested.
The Favag is designed for the European master slave clock systems, which usually run on 12 or 24 volts dc, with 1 minute impulses, and changing polarity every minute.
My Favag runs within ± 2 seconds per week, which is very accurate.
A solid wall is important too for mounting a masterclock, and not exposed in direct sunlight to avoid excessive temperature changes.
The French Electrique Brillié system uses the alternating polarity system with changing polarity every 30 seconds, for a 1.5 Volts dc supply to the clocks.
In case of the English 30 seconds single impulse slave clocks the minute wheel may be a 30 seconds wheel with 15 cogs and 1 contact pin, or a one minute wheel with 30 cogs and 2 contact pins.
I have a Favag booklet somewhere in my archives and see if can find exact distances are for the position of the Hipp Toggle in comparison to the pendulum rod.
For the 2/3 seconds beat i can measure it for you, but you are designing it for a one seconds beat, so i assume it will be within proportion, distance wise.
If you are in the building stage and get excessive swing you can always reduce the voltage applied to the driving coil by inserting a resistance in series.
Regards, Raymond