Eyeglasses, Loupe's, Microscopes and other Optics
Discussing Watchmakers Eyeglasses, Magnification, Microscopes, Loupes and general Optics used in Horology
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yeah, that's a Hermle 340-020 movement (https://www.cousinsuk.com/product/hermle-340020-a). I have one here on my bench. -
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By nevenbekriev · Posted
OK, today I visited a friend who is watchmaker and asked him if he has useless old sapphire crystal. He took out one from an old Seiko Kinetic for parts and gave it to me. I came home and started work. The first I did was to break the crystal with the hope some small piece will have suitable shape to work on. For my surprise, appears there is thin (0.35mm) sapphire layer on top of a thick glass piece. I first was disappointed, as the stone I need is with diam 0.65mm (and then ground to half to obtain D cross-section) but then figured that it may be actually better for me. Realized that I can use one of the flat and polished faces as locking face of the jewel and thus there is still enough meat in thickness of the sapphire. So, I ground small rectangle piece and glued it with shellac on the side of a 0.6mm steel plate, then filed it round and lapped it to form the 'back' of the stone. I think the stone is good enough and will do the job it is meant for. I cleaned all the parts of the movement as there was gummed oil everywhere. The spring is very strong and it was challenge to get it wound while holding the barrel and collect it in the winder barrel to extract it. It left for tomorrow to test everything -
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