Mainspring Barrel Inspection, Repair and polishing for a Hamilton 917
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- Опубликовано: 2 авг 2024
- In this video, I show you how to repair the mainspring barrel, including the inspection process.
I also show you two different methods you can use to polish the mainspring arbor as well as polishing the mainspring barrel pivot holes and pivots holes in the main-plate and mainspring barrel bridge.
When servicing any mechanical watch, the first point of inspection should be the mainspring barrel. The mainspring barrel provide not only the power for the power train of the watch, it also provides the power for the dial train.
The first step in repairing the mainspring barrel is the inspection the teeth on the mainspring barrel drum. After the mainspring barrel teeth and arbor have been inspected, the end-shake and side-shake of the mainspring barrel are inspected. If a repair to the mainspring barrel is necessary, this is done first followed by the polishing of the arbor and mainspring barrel pivot holes.
Once the mainspring barrel has been inspected, the barrel is assembled and installed between the bridges and the end-shake and side-shake are inspected again. One of the most common issues with servicing a vintage watch that does not have jewels for the mainspring barrel is wear at the pivot holes. This wear must be corrected for maximum and stable amplitude.
When you are servicing a mechanical watch, having an accurate rate is directly tied to the available amplitude at the escapement. When servicing vintage watches, there is almost always going to be wear at the friction points, like the barrel arbor and pivots holes, that need to be corrected.
Reducing the friction at the barrel will help you achieve the maximum available power to the watch escapement
💥TIMESTAMPS:
0:00 Parts to be inspected
0:26 Inspecting the Barrel Teeth
2:03 Inspecting the Arbor
2:37 Two Ways to Polish the Arbor and Pivot Holes
7:17 Checking the barrel for End and Side-Shake
8:07 Correcting End-Shake in Mainspring Barrel
10:30 Checking End and Side-Shake with the Barrel in the Plates
11:20 Repairing Mainspring Barrel Side Shake in the Plates
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Thank you for showing and sharing your experience. I just made a new save folder called "The Right Way." I suddenly have a lot of watches to service. The ones I thought I'd already serviced! This is true RUclips gold. Keep 'em coming.
Thanks for this one. I was looking for the best way to polish pivots without a Jacot tool. And how to deal with sideshake.
Thanks much. Good stuff. I hope you start posting again.
Thought this video is fantastic, easy explanation to follow, straight on problem solving. It has everything, thank you! Only thing I also wanted to see (now I'm spoiled) is adjustment of endshake barrel bridge/main plate to barrel arbor ;)
Thank You . Stay tuned
I hope you find some value in my latest video. If you have any questions leave a comment. Thanks for you support.
Great work!
Great video! Just what I was looking for!
Awesome videos! Thank you for sharing 👍🇩🇰
Thank you!!!
I like the video
Thanks a lot for the instructive video. I took a lot of notes about what to check on a barrel. A couple of questions if possible:
1. what is the name of the tool you used to manual polish the barrel arbor?
2. You detected side shake between the barrel arbor and the barrel. Then you fixed the side shake of the barrel in the main plate and bridge. Does that fix also the side shake of the barrel or should it be fixed in the same way? Many thanks in advance Fabrizio
Diamond pastes work great for polishing but I've heard the advice to not use them on brass, else grit can get embedded in brass and quickly wear away whatever brass contacts, in this case the arbor. WDYT? Given that the tool (pegwood) is softer than brass, maybe this is unlikely to happen? Thank you!
Great video. Do you repair the barrel and lid the same way, or do you just buy a new one?
👍👍👍 🇧🇷
my mind is blownnnnn
Great video! I’m learning so much for your videos that I’ve decided to tackle one of these movements, myself. I’m sure I’m in over my head but I love a challenge.
I’ve disassembled the movement and I’m in the process of cleaning everything, the pivots are pretty dirty. I’ve taken a bunch of pictures as I go but I messed up and didn’t take any photos of how the mainspring was installed. When I finally get my mainspring winder, I’m afraid I won’t know how to install the spring.
Do you have any videos of you removing or installing a mainspring on the 917 or something similar? I still need to clean the balance jewels and I really don’t want to fuck up this movement. I’m hoping to put it in a wristwatch case for myself when it’s done.
Also, in the part of the video where you are polishing the mainspring barrel pivot, is that a piece of rubber that is screwed onto the end of your rotary tool arbor, or is it peg wood with polishing compound on it?
Thanks for the great videos!
Amazing tips Alex. This a silly question. Can we use toothpaste or metal polish instead of the compound you are using on the flattened toothpick? Also, I never thought of using a domed punch to make holes smaller. I use a small punch around the hole. This way it will be more accurate and leave no marks.
You want to be careful of the grit size so you don’t open it up to much. I think the diamond paste I use is about 50000 grit so it’s pretty fine. I sometimes also us Polinum.
I always have used the domed punches. It was just the way I was taught.
Thanks Alex. Is the side and end shake of the barrel a result of the polishing to the arbor and the barrel?
It certainly could be if the polishing was to aggressive.
Usually wear between the arbor and barrel is caused by grit mixed with excessive lubrication, which attracts dirt like a magnet, grinding away at the barrel holes when the mainspring is wound. Excessive end shake in the barrel is most often the result of the barrel lid or bottom ring bent
Thanks Alex, full of great tips! How much of a difference does this level of polishing make?
Well it definitely help the oil bead up.
Hi sr could you show us how can you fix the endshake of barrel in 7750
It’s pretty much the same. Just make sure the barrel is not touching the bridge or main plate. Are you having an amplitude issue?
Is it possible to replace mainspring in a barrel that says do not open?
Absolutely. If the seam is on the side of the barrel you can use a razor blade it open it
Hi Alex
I am fault finding a Seiko 6309a. The mainspring barrel hole is worn and it's causing it to jam up. On closer inspection of the hole it looks like it's worn, out of round. The metal has worn out of round not spread How would I Bush this hole keeping it central.
Well Vincent, that’s a serious question and it is not gonna be answered in this response because it’s involved and requires tons of explanation. I’m planning on doing some bashing videos on my other channel but in the meantime, I would seriously consider getting a new mainspring barrel.
@@watchrepairtutorials Thanks Alex.