Ondrej Berkus
254
You are way too kind, thank you.
Apr 24, 2016,12:05 PM
The stopwork making was a bit intense and i have no pictures, however i remember the proces very distinctly - i made a paper template 20:1 and from available space on the top lid i determined how big the parts can be. Then i determined where the centers of the star cutouts will be, how wide the channels in the star will be and where to drill the two holes in the fingerpiece. I then put a rotary table on my milling machine and using 5mm enmill, i milled six pockets ( because the diameter of the fingerpiece was determined at 4.98mm ). Then i milled the channels with 1mm endmill ( yes, i planned a lot of dimensions based on the tools i have). Star wheel done.
On the finger piece, i broached a square first and then centered it in the rotary table. Drilled two holes according to the plan and then just milled the diameted and filed the finger to work properly.
Job done 
Ondrej
edit: i used O1 steel for the parts - i use it for all my steelwork. I can get it easily in many precision ground sizes, flat and round. And i don't have to worry about my pinions distorting during HT, as i cut my leaves in heat treated steel with carbide tools.
This message has been edited by Ondrej Berkus on 2016-04-24 12:09:43
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I haven't given up yet :)
By: Ondrej Berkus : April 17th, 2016-11:47
Getting through assembly slowly... very slowly The stopwork is stopworking nicely and the barrel is now put together and already pre-tensioned, taking out the last 3/4 of a turn of the spring, which is pretty much useless anyway. The other end is shortene...
That is beautiful!
By: aditya : April 21st, 2016-12:36
Is your watch based on the Unitas? Does the reverse last coil of the mainspring not help? I thought the reverse coil helps pump in more power into the last coil. Kind regards Aditya
Thank you
By: Ondrej Berkus : April 22nd, 2016-11:54
It is very loosely based on Unitas, meaning i 'borrowed' mainsprings, hairspring, escape wheel and pallet fork. The rest is made in my workshop. The next movement i'll make ( the one i'll jump right on after i finish and case this ) will have, or at least...
Wow, wow, wow....
By: DonCorson : April 22nd, 2016-13:28
Wow Ondrej, no going half way ! I always look forward to see your next post. The barrel is an often overlooked, but very important component in a watch. From an uneven power supply one will never get a good even rate. Don
I always look for your latest post
By: David Walter : April 24th, 2016-08:43
I agree with Don, the barrel is usually overlooked yet it is the powerhouse for the movement and deserves the care you have given it. No pics on making the Geneva stop work and what steel did you use ? Great work. David
You are way too kind, thank you.
By: Ondrej Berkus : April 24th, 2016-12:05
The stopwork making was a bit intense and i have no pictures, however i remember the proces very distinctly - i made a paper template 20:1 and from available space on the top lid i determined how big the parts can be. Then i determined where the centers o...
