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Post by clockwise on Jan 22, 2024 10:10:40 GMT -8
Hi everyone, I’m new here and amateur watch maker, however, I’ve been reading this thread about repairing the chronograph 4th wheel, because, well, I destroyed mine trying to push down on the 4th wheel to lubricate the shaft, as shown, in the 6139 manual, and I ended up pushing the wheel off its staked portion. Anyways, I’ve been reading everyone’s replies, but as someone who used to work in a machine shop and studied mechanical engineering, although I haven’t used those skills in a very long time, I was thinking of how to solve the problem, albeit with my limited watch making knowledge I’m not sure it would work. What if there was a way to make a stake that fit over the chronograph clutch but between the clutch plate and 4th wheel, that would be able to push sufficient pressure onto the 4th wheel to restake it. I’ve included a very very rough sketch of what it might look like. Any if anyone here is able to make it, by all means and let’s get these chronos fixed.
Edit: how do I add photos?
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saldog
WS Benefactor
Aspiring to be a savant, but for now just a watch idiot
Posts: 1,100
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Post by saldog on Jan 22, 2024 11:55:06 GMT -8
Hi everyone, I’m new here and amateur watch maker, however, I’ve been reading this thread about repairing the chronograph 4th wheel, because, well, I destroyed mine trying to push down on the 4th wheel to lubricate the shaft, as shown, in the 6139 manual, and I ended up pushing the wheel off its staked portion. Anyways, I’ve been reading everyone’s replies, but as someone who used to work in a machine shop and studied mechanical engineering, although I haven’t used those skills in a very long time, I was thinking of how to solve the problem, albeit with my limited watch making knowledge I’m not sure it would work. What if there was a way to make a stake that fit over the chronograph clutch but between the clutch plate and 4th wheel, that would be able to push sufficient pressure onto the 4th wheel to restake it. I’ve included a very very rough sketch of what it might look like. Any if anyone here is able to make it, by all means and let’s get these chronos fixed. Edit: how do I add photos? The ProBoards website that hosts Wrist Sushi does not permit actual uploads of photos, only links to photos. If you have a cloud storage solution already for photo sharing (e.g. PhotoBucket, Google Photos, Flickr), you can put your photos there and get a URL from that location to insert into one of these messages. I use Imgur.com for storing photos that I share here. It's free and does not seem to have any limitations that I've discovered. I use my desktop computer for uploading and managing photos at Imgur because the mobile app seems to be geared only for consuming content there rather than managing it. After creating your account, create an image library and upload images to it. Select the image you want to insert and you'll get a pop-up that shows numerous types of links. Use the "Direct Link" and copy that URL. Come back to your message and click the "Insert Image" toolbar button, then paste the URL you just copied. Your image will display inline in your post. If you want to do things while mobile, you could use the "Tapatalk" app ( Android - iOS). That makes it easy to simply insert photos that are stored on your mobile device. One limitation of that app is that it will only let you insert one photo per post (for free version users). The app is a bit buggy and not the most intuitive user interface, but it works most of the time and is more convenient to post a quick photo. Welcome to Wrist Sushi! Saldog
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Post by clockwise on Jan 22, 2024 13:26:25 GMT -8
Hi everyone, I’m new here and amateur watch maker, however, I’ve been reading this thread about repairing the chronograph 4th wheel, because, well, I destroyed mine trying to push down on the 4th wheel to lubricate the shaft, as shown, in the 6139 manual, and I ended up pushing the wheel off its staked portion. Anyways, I’ve been reading everyone’s replies, but as someone who used to work in a machine shop and studied mechanical engineering, although I haven’t used those skills in a very long time, I was thinking of how to solve the problem, albeit with my limited watch making knowledge I’m not sure it would work. What if there was a way to make a stake that fit over the chronograph clutch but between the clutch plate and 4th wheel, that would be able to push sufficient pressure onto the 4th wheel to restake it. I’ve included a very very rough sketch of what it might look like. Any if anyone here is able to make it, by all means and let’s get these chronos fixed. Edit: how do I add photos? Hi there guys, I hope this drawing makes sense. If I still had my AutoCAD or NX working, I would’ve made a better drawing but I hope you can get the gist of what I’m trying to show.
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Fergus
Needs a Life!
Posts: 2,953
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Post by Fergus on Jan 22, 2024 21:26:52 GMT -8
From my close inspection I believe the 4th wheel is pressed onto the pinion. The pinion is stepped but the teeth are cut through its full length meaning on the lower step they are truncated. The wheel is pressed onto the truncated teeth.
I think it will require more force than your tool can offer with the lower disc only 0.18mm thick.
This said, if I get time today I will model it and show it in position.
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Post by clockwise on Jan 23, 2024 2:30:57 GMT -8
From my close inspection I believe the 4th wheel is pressed onto the pinion. The pinion is stepped but the teeth are cut through its full length meaning on the lower step they are truncated. The wheel is pressed onto the truncated teeth. I think it will require more force than your tool can offer with the lower disc only 0.18mm thick. This said, if I get time today I will model it and show it in position. I agree with the stepped pinion, but from my observations on a loupe, the pinion has been machined down and then the wheel is pressed, but what I can’t tell, without taking it apart is if the machine pinion cut teeth into the wheel. I guess I could go back in this thread and look at the pictures closer of a dismantled chronograph clutch and wheel. Also, what I don’t know is what the machined diameter of the pinion that the wheel presses onto. Perhaps someone else can measure one. I agree with the force maybe not enough with the thin plate at the bottom, but I was thinking that designing it with a full profile but with a slot for the chronograph pinion to slide in, it might work. Kind of like a valve spring compression tool to release the valve keys for a car engine. I’m excited to see your drawing.
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Fergus
Needs a Life!
Posts: 2,953
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Post by Fergus on Jan 23, 2024 5:15:49 GMT -8
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