To avoid misunderstanding:
My remark was -not- to criticize this procedure, but caused by the fact that I thought (to my surprise) that the dividing was done without proper mechanical fixes.
Happy to hear now that the size of the first tooth was the same as the last+1 ….;)
I (personally) don' expect that many will do this, because most mills have tension-levers to securely fasten the table/bed.
But if that (common) option is not available, this seems to be a good solution.
I have asked my friend, building a Riefler F type.
Here his answer, may be this can help another little bit ?
So I quote his answer:
It was quite a search, but I think I now know what it is. And then I concentrate entirely on the bob that John is talking about: the...
Well, last resort here....
I presume you also know the fabulous book-series: Präzisionspendeluhren (PPU) von Juergen Ermert.
I saw there that the author (above) can be reached easily:Juergen.Ermert@PPU-Buch.de
I should think, that he should ….:-) know the answer.
A friend of mine, is building a Riefler.
He possesses the book from Dieter Riefler about his grandfather: Sigmund Riefler.
Do you know the contents of this book ?
If the answer is "no" than I can ask him if... there is information in it.
As far as I can see here in this bob there are 2 nuts in the middle, which can probably adjusted by small pins (?) in them, just as is the case in small lathe chucks.
I can also imagine that after the adjusting by hand (and polishing/cleaning thereafter) the bob is never touched...
This mechanism was made as an exercise-project for a young clockmaker about 35 years ago.
So it never was part of a clock. But …. of course the central axis can adapted to a clock mechanism.
If I remember well it was published in an 18 century book..., but I don't know the real origin...
I was allowed to make drawings from an existing perpetual calendar.
May be of help ?
Some "regular" screenshots and a rotatable... 3D-PDF. (Functions only with Adobe PDF-reader and adapting the settings for 3D-PDF's; so first download and thereafter view).
I'm so sorry, but I did not understand the procedure.
The depthing is clear of course.
This procedure gives -one- right distance between the 2 centers (of course).
But then your sentence...: "I then draw circles in CAD of each distance".
I don't understand what "each distance" is...
Recently (November) I was in the Amsterdam Arts and Antiques fair "PAN" in Amsterdam.
PAN Amsterdam - Home
On the exhibition stand of Gude and Meis ( Gude & Meis ✓ Antieke klokken te koop ✓ Ruim assortiment ️) a pendule like yours:
Een fraaie Franse bronzen figuratieve pendule...