The Vienna Regulator

This clock contains the anchor escapement of the recoil type.  If one looks closely at the escape wheel in action, it moves backwards, or recoils a little after each tick,  hence the name.   The impulse faces or pallets are set at an angle of about 45 degrees to their line of motion.  If they were steeper, there would be excessive friction on the recoil.  If flatter, there would be excessive friction during the impulse.  Hence 45 degrees is the best compromise.  The Vienna regulators were usually wall clocks with a glass front, having a pendulum made of wood with a large lenticular bob.

This Meccano clock keeps exceptionally good time.  It is built around the MW Models special 30 tooth ratchet wheel, which makes a very accurate escapement wheel.  The pallets are fashioned from short threaded pins which have been filed down to a half round.  The power supply of the clock is simply the weight of a small electric motor with built in reduction gearbox, which climbs around the centre wheel as published by John Wilding.  The motor used is the M.D. motor suppied by Mike Rhoades and is switched on by a mercury tilt switch.   The pendulum suspension spring is a small piece of spring steel from a feeler gauge, and is accurately clamped between pairs of triangular plates. 

The clock movement is very simple because there is no need for a long power train.  The last two shafts are mounted between needles bearings, as is the pallet shaft.  The clock is easily adjusted for accurate time keeping.   It is powered by a 9v battery, and will safely run for months unattended.

The clock is housed in a Meccano case, stands on a wooden plinth, and has glass sides and top, but it could also be made as a wall clock.  It is hoped to produce the clock in the form of building plans and a self contained kit.


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