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DonCorson
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A David Walter Double Pendulum Clock – Part 7, The Escape Wheels

A David Walter Double Pendulum Clock
    – Part 7,  The Escape Wheels



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
    - Installment 6 – Completing the Barrels, Cutting some Pinions

In this installment we will follow the making of the escape wheels.  Pin wheel escape wheels are much more time consuming than the more traditional deadbeat, Graham, escapement wheels.  As the escape wheel is one of those parts that is intimately connected with the timing accuracy of the clock the precision of the execution of the escape wheel is paramount.  To this end all this work is done on a Leitz jig borer for its stability and accuracy.

A 5mm slot mill is used to drill the center hole.  This provides a very precise hole at the expense of drilling time.



The 30 1.4mm holes for the pins are drilled using a rotary table to do the positioning.




The two escape wheels after drilling the 60 holes for the pins.



Back on the lathe the escape wheel is turned to diameter.  Note the big clamping disk to dampen any vibrations during the turning process.



Marking the wheel for crossing out.



Piercing the final crossing of the wheel.



Both escape wheels finished and surfaced, but not yet polished.  We see also the assortment of files used for this work.

I am really curious to see what David will be doing next.


This message has been edited by DonCorson on 2015-07-30 23:07:15 This message has been edited by DonCorson on 2015-07-30 23:08:01 This message has been edited by MTF on 2015-08-01 02:07:46