SuitbertW
2411
Hi, Philippe,....
Nov 04, 2007,06:57 AM
....I believe GP opted for this design for beeing flexible and vesatile. Of course one could use the classical small seconds design and use the fourth wheel directly to display the second. But, than you're also bound to design the train around it - i.e. other considerations must go one step back in the list. They obviously wanted to have the options they now have 
the double third wheel is just a well tried and elegant solution to drive an indirect second (be it in the center or elsewhere. Plus, the you have a good "access point" for a module - if necessary even with the option of a connection without any backlash - something which can help a lot for a good working chrono odule for example. That's thanks to the double third wheel.
If one wants to have a staright forward structure in base movement and iterations of it - one and the same going train is something very logical, IMO. So, one base for small seconds without the double third wheel and another base for all others wouldn't make much sense to a manufacturer .
I even don't know at what precise position the fourth wheel is in the new movement - perhaps it's just a tiny bit off 9 position and would also look awkward......as said, to design a movement one has to take into account many, many points. And I'm sure I don't know only a fraction of them
Best regards
Suitbert
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Part 3 - some more details of the new caliber GP4500
By: PeterCDE : April 3rd, 2007-00:07
As we´ve seen, the new GP4500 caliber incorporates some practical, new solutions to improve the efficiency, longevity and durability of this movement. It is promising to be an accurate, sturdy timekeeper for a long time to come. But is it a nice movement ...
Thanks a lot for this exciting pics and insights
By: Alexander from Germany : April 3rd, 2007-06:42
Peter, that's a great thing what you're again doing for us! Amazing pictures I love very much. And I'm particularly glad to learn about and understand now this movement in a way I would like to be able to understand the 3XXX mvts. as well, which have not ...
Oh, there´s something for you!
By: PeterCDE : April 3rd, 2007-12:06
Hi Alexander, thank you a lot! That´s much appreciated and the pleasure is completely on my side! In terms of the GP3xxx range, have a look here. There aren´t many chances to get much closer than this: http://www.tp178.com/jd/gp/article1b.html Sure it´s n...
Indeed,
By: Alexander from Germany : April 4th, 2007-03:42
thanks again for this hint, I didn't note this study before, best wishes for the feast days, Alex
Thank you Peter
By: pr7 : November 2nd, 2007-09:07
Hello Peter, first I wanna thank you for this indepth look. I was wondering about how GP will provide the same moment with the central second position with a double third wheel, but with the second at 9 with a singular third wheel? Because in my opinion t...
Like this?
By: PeterCDE : November 2nd, 2007-11:59
Hi Philipp, something like this? These are prototypes and in fact the GP4500 caliber with central second! While i can´t share details on upcoming models, at least it seems such is being evaluated very closely... Does this help a bit? Cheers, Peter...
More technical...
By: pr7 : November 3rd, 2007-15:16
Hey Peter, hmm... that's not really what I meant, but also nice pictures of course. In part 2 you showed us a picture with details of the different variations of seconds. And if GP produces the second at 9 they perhaps will have different torques and thou...
Oh, that´s what the double third wheel is made for
By: PeterCDE : November 3rd, 2007-16:23
G'day, regardless the attachment of the wheel driving the second hand, amplitude and performance will always be the same. As noted, that´s what the double third wheel is made for; the second hand pinion always engages the same wheel, eliminating the need ...
We're getting closer :o)
By: pr7 : November 4th, 2007-03:45
Hello Peter, yes in this case you're right. But what if you use the second wheel to display the small second at 9 without the second hand pinion like on the picture with only a single third wheel. You definitly will have less engagements in your going tra...
Well, i think that´s not possible
By: PeterCDE : November 4th, 2007-06:30
G'day, i´m rather tempted to trust GP´s engineer in this one Actually attaching a seconds hand onto the second wheel is a rather unconventional thing to do and as said, regardless the position of the second hand there´s no difference otherwise. In this i ...
Hi, Philippe,....
By: SuitbertW : November 4th, 2007-06:57
....I believe GP opted for this design for beeing flexible and vesatile. Of course one could use the classical small seconds design and use the fourth wheel directly to display the second. But, than you're also bound to design the train around it - i.e. o...
