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DonCorson
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A David Walter Double Pendulum Clock – Part 6, Completing the Barrels

A David Walter Double Pendulum Clock
    – Part 6,  Completing the Barrels, Cutting some Pinions



David Walter's new double pendulum perpetual calendar clock is advancing every day.
For those of you who didn't see the earlier installments of this series, you can catch up by looking here:
    - Installment 1 – Introduction and Cutting out the plates
    - Installment 2 – Making the Barrel
    - Installment 3 – The Suspension
    - Installment 4 – Invar Pendulum Parts
    - Installment 5 – Making the Wheels

In this installment we will see the finishing of the barrels and their mounting in the movements.  The barrels are mounted behind the back plate of the movement and have their own cock.  We will also see the cutting of some pinions.
Here we see the pivot hole being reamed to size in a barrel cock.




The back plate is cut to allow the drum to pass through.



The back plate with the cut out piece.




Turning the front pivot of the barrel to size and length.



The winding square is milled on the lathe with the dividing head.



Here we see the maintaining device mounted in its recess in the great wheel.  The second wheel is the maintaining ratchet wheel.  These two wheels slip over the barrel arbor with the post in the maintaining spring engaged in the small hole above the center of the ratchet wheel.   When the winding crank is turned the ratchet wheel prevents the great wheel from turning backwards and the maintaining spring supplies the energy needed to keep the clock running during winding.



Here we see the completely mounted barrel assembly.



The 40 pillars for the two movements are lined up here as they will be assembled.  The longs pillars t the bottom of the picture are mounted on the back plate of the clock, the movements are attached to them.



Both movements from the side.  At the top we can see the detents for the maintaining ratchets and on the right hand movement we can see some of the cocks for the equation work.



The movements from the back with the barrels, cocks and steel endpieces fitted.



Now we start with the cutting of the pinions.  Here the cutter is being aligned.  To make this alignment easier the tip of the pin has been ground to the width of the tooth on the cutter.



The steel pinions are cut under a flow of oil.  The oil reduces cutter wear, removes the chips cut and keeps the cutting surfaces cool.



Here several cut teeth can be seen through the oil flow.




Some cut pinions, 6, 12 and 15 leaf pinions.



Some of the cut wheels.  Some of the wheels on the right we have already seen.  From the left the others are the month or intermediate wheels, the center wheels, the third wheels and the minute and hour wheels for the sidereal train.  Lower center we see the escape wheels, drilled and crossed out, ready for the pins to be fitted.  The small wheels at the bottom are part of the sidereal train all with uncommon (in horology) prime tooth counts.




Next we will see the finishing of the escape wheels.


This message has been edited by MTF on 2015-07-29 03:25:50

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