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Can some one show me how to put this calendar works back together. Thank you.


Jeremy

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10 minutes ago, Jeremy said:

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Jeremy,

Yes I can help you get the calendar together but it's already past midnight here in Brooklyn. I'll give you my directions tomorrow. I don't have pictures of the BFG 856, but have plenty of the 866 which is similar. More to come....

 

J

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Thank you soo much noirrac1j. I finished it. Had some trouble with the spring shooting across the room. Found it about half an hour later with a giant magnet. Used peg wood to make sure it didn't fly off the next go around. You rock!  could not have done it with out the detailed photos. Here it is complete.

IMG_20170221_230133.jpg

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You did it already? That's fantastic! I will suggest for next time never, ever remove or install a spring without first placing cling/saran wrap onto it to hold in place--no matter how nice it looks! It looks great and kudos to you for perseverance! 

J

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On 2/22/2017 at 11:13 AM, SeikoWatch said:
Very well explained noirrac1j .. often it is better to use a video camera and film everything. It is always easier to do the reassembly afterwards. I already learned it at my own expense ;)

 

Yes I agree. I might invest in a camera with digital microscope soon.

J

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    • Yeah, I saw that in the tech sheet but I don't see how it can be adequately cleaned with the friction pinion still in place. I've accidentally pulled the arbor right out of the wheel once when I used a presto tool to try and remove it. Mark shows how he does it with the Platax tool. Those are a little too pricey for me so I got one of these from Aliexpress and I just push down on the arbor with the end of my brass tweezers. That usually gets it most of the way out and then I just grab the wheel with one hand the and the friction pinion with the other and gently rotate them until it pops off. Probably not the best way but it's seemed to work for me so far.    
    • Thanks, Jon Sounds like a plan. Obviously I'll have the face on so do you think gripping with the holder will create any problems, but I will check in the morning to see how feasible it is but I assume it only needs to be lightly held. As for holding the movement instead of the holder won't be possible in this scenario as one hand will be puling on the stem while the other pushes the spring down. That was my initial concern is how the hell can I do this with only one pair of hands. All the other times I've had to remove the stem hasn't been a problem, apart from the force required to release the stem from the setting lever, but now I need to fit the face and hands its sent me into panic mode. If it had the screw type release things would be a lot simpler but that's life 😀   Another thing I will need to consider is once the dial and hands are fitted and the movement is sitting in the case I will need to turn it over to put the case screws in. I saw a vid on Wristwatch revival where he lightly fitted the crystal and bezel so he could turn it over, is this the only option or is there another method?      
    • Hi Jon, do You think that relation spring torque - amplitude is linear? I would rather guess that the amplitude should be proportional to the square of the torque. I had once idea to check it, but still haven't.
    • I did not. I thought about it, but I had cleaned it in my ultrasonic, and the tech sheet shows lubricating it in place already assembled, so I figured discretion was the better part of valor. Although since I have to depth the jewels anyway, maybe I pull the pinion off to rule it out 100% as part of the problem. Do you know if there's a safe way to do it? I don't want to use a puller because it would push down on the plane of the wheel, and that seems like a Bad Idea. I thought about using a roller table remover, but I don't think I have a hole stake pointy enough to push it down.
    • Before putting it back in the case I would fit the hands and use a pin vice on the stem to make sure the hands were in line. 
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