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| Joined: | Thu Apr 16th, 2009 |
| Location: | Arctic, Norway |
| Posts: | 5821 |
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The problem is mechanical and as I see it: I guess that an existing watch movement , quartz or mechanical hasn't enough torque to ignore totally the friction produced by the hands who would be stressed by a border or rail changing them length.
A watch pinion can't be under stress when impulsed by a usual movement: It false all impulses and time accuracy it was regulated for.
But!
Urwerk came out with the 202 Twin-turbine hammerhead few years ago: There, the hands are switching length across the dial.
It's a rail system engraved in the dial who influence the pin coming in and out of the hollow hand.
Well, there's not only this feature in fact, as it's one of somes who are really amazing.
The thing is that when you achieve such engineering works, you can't sell the result "cheap"...
You will observe the rail system on this video:http://www.youtube.com/watch?v=WLTBnIszCLE&feature=related
I let you observe the watch itself on Urwerk.com where you can see the rail on the dial and the hands with different length.
You can also click on the left and be explain the all stuff with the mechanism decomposed and see again the video: http://www.urwerk.com/watches_202.asp
All of this isn't new: Just very challenging for anybody who wouldn't be a micro-mechanical engineer genious(or a team of them) with extremly large funds behind...