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

Jul 30, 2015,23:04 PM

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

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Piece by piece this clock emerge!

 By: blomman Mr Blue : July 31st, 2015-23:47
Thank you for sharing this piece by piece journey! You wrote: " A 5mm slot mill is used to drill the center hole. This provides a very precise hole at the expense of drilling time." What kind of time frame are we talking about here? Best Blomman


 By: DonCorson : August 1st, 2015-01:14
A drill is designed to cut on the front edge when plunging into material. A mill is designed to cut on the side when pushed sideways into material. Many mills can't be used to plunge into material because their geometry is such that they do not cut in the... 

Thank you for the explanation! [nt]

 By: blomman Mr Blue : August 1st, 2015-11:54

Very nice use of a Leitz jig borer

 By: Ophiuchus : August 1st, 2015-17:09
I would love to know what model David uses. Those are hard to find. I wonder- if using a jig borer, why use endmills and drills- every hole cut with multiple tooth cutters theoretically has some runout- or at least, wouldn't be as geometrically round as a... 

Leitz Jig borer

 By: David Walter : August 4th, 2015-13:06
The model I have is refered to on the user manual as "Precision Jig Borer" I see no model number. I have added a photo of the Leitz, I have added Heidenhain digital readout scales to the X & Y slides. A very nice feature is that it takes 8mm collets. ...  

David, beautiful jig borer

 By: Ophiuchus : August 31st, 2015-18:34
I am very envious- that is a really incredible setup you have. That's basically as good as it gets. While items of that caliber are rare, and thus very expensive- in general, I have seen many jig borers of small size sell for fractions of what they would ... 

Leitz Jig Bore

 By: jaseds : August 18th, 2019-11:49
Just purchased a nice Jig Bore like is they cannot find the manual.I have figured much of it's operation but not sure how you attach the bits in the spindle and how machine actually operates. Do you know where I may obtain any info or if you have could p...