Okay, I know this is a bit off topic, so just move it to the lounge if it's too much...
A while ago our company department went on an excursion to
La Chaux-De-Fonds in the Jura mountains, the capital of watch manufacturing. Around 1900 more than 50% of all watches made in the whole world came from this town (not region!). The whole town was built with the purpose of producing watches, that's why all buildings are long with large windows and arranged in a grid to maximize the sun exposure, because watchmaking needs a good light source.
Nowadays almost all movements in production watches (even the really expensive ones) are standard movements made by a few large corporations. But we went to see a small atelier of a
custom watchmaker who manufactures every part in house (except the hairsprings). Like the top custom knifemakers here, his watches are built and finished to absolute perfection, everything including the smallest screws are CNC machined to insane tolerances and polished by hand. Even the hidden surfaces which are never seen again once assembled are treated the same way.
This is the building, hard to imagine that there are several CNC milling machines and lathes in there
A lot of the work is polishing parts...
More polishing, every surface is hand polished with diamond paste. I got all excited and just wanted to pull out my knives and touch them up
Some of the parts, the attention to detail was just unbelievable...
This is a partially assembled movement. As you can see the surfaces are not yet properly done. They first assemble it completely and adjust it so everything works perfectly (this takes about a week). Then the whole thing is taken apart again, every surface is properly finished, cleaned and then assembled a second time (the final assembly only takes about a day since everything fits now).
These are some different patterns they can make for the dials.
There is an amazing contrast between the computer controlled machining centers and very old tools like these used side by side.
This is a guilloché machine to cut the aforementioned patterns into the dials. The dial is glued onto the thick brass plate on the end of the axle and the cutter is mounted on the right. On the massive mount to the front left is a pin, which glides along one of those patterned brass rings. The whole axle can rock back and forth and is pressed against the guiding pin with a spring. Then the whole thing is turned slowly to cut beautiful ring patterns. It takes a skilled craftsman about two days to complete one dial...
Here you can see the crisp patterns on the dial, they look amazing when turning them in the light.
That day I had my great-grandfathers knife with me.
A last picture of an extremely complex minute repeater, which strikes the hours, 10-minutes and minutes on the push of a button.
It was an amazing look into the specialized world of watchmaking, I hope you enjoyed it. If one of you watch enthusiasts is ever in the region, it is definitely worth a visit (the Jura mountains are beautiful as well).
I'll try taking some pictures of my grandfathers pocketwatch next time I visit my parents...