WatchTech

Ondrej Berkus
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Thank you

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 try to have my own escapement. Not meaning i have invented an escapement, just designed one according to instructions in Daniels' Watchmaking. I already have a pretty cool 20:1 model made out of acrylic.
Now, the mainspring - you are right about the reverse last coil, but the problem is that i have two mainsprings in one barrel, on one arbor. And although i went through many mainsrpings, the closest pair i could get still had 1.2mm difference in lenght. That caused the shorter spring jump off its arbor hook when the longer one unwound. It probably wouldn't happen when mounted in the movement ( because it wouldn't wind down completely), but for assembly purposes, the spring jumping off its hook would be a giant pain in the rear. Plus, stopwork is such a cool device, isn't it?
So i'm solving two problems at the same time - eliminating the last 3/4 of a turn when the springs are weakest and making the whole affair easier to assemble. The elimination of the extremes of the mainspring torque via stopwork is also done for more accuracy - more consistent power to the movement, but let's be honest - i'll be happy if this watch runs anywhere near usable accuracy and withstands mid-long term wear. It's just a proof of concept and it has given me many ideas what to do and make better on the next one...
Ondrej

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