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waltham 18s Riverside ratchet wheel

LittleWatchShop
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LittleWatchShop Distinguished Member

LittleWatchShop

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There is no investment in this watch, money or otherwise...just another project.

Would I be foolish enough to try and fix this broken tooth. Frankly, I think it will function, even with the broken tooth.

I have lathes, mill, saws, files...etc., but a precision tool in the wrong hand is no better than a hammer...but it might be fun to try.

20250211_145735.jpg

While here, can somebody explain the keyless works?

20250211_160358.jpg

tomh207 Distinguished Member

tomh207

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It looks like it is a negative/push to set arrangement to me. You push the crown towards the case to set the hands rather than what we are commonly used to.

 

Tom

JohnR725 Distinguished Member

JohnR725

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12 hours ago, LittleWatchShop said:

Would I be foolish enough to try and fix this broken tooth. Frankly, I think it will function, even with the broken tooth.

I have lathes, mill, saws, files...etc., but a precision tool in the wrong hand is no better than a hammer...but it might be fun to try.

Typically it's not a problem if you're missing one  tooth.

But you could pretend that this is a clock gear and I take a quick look at YouTube and the first video I saw was well just skip over how bad the photography what's so looking for something that did not involve poorly filmed moving pictures and here is a classic of replacing a gear tooth you should be able to apply the same principle here other than it's a steel wheel and that might make things more interesting. In particular the type of solder you're going to use this is where perhaps some sort of localized welding might be nice I don't suppose you have a laser welder?

https://mb.nawcc.org/threads/how-to-make-a-dovetail-for-replacing-a-wheel-tooth.106329/

 

LittleWatchShop Distinguished Member

LittleWatchShop

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2 hours ago, tomh207 said:

It looks like it is a negative/push to set arrangement to me. You push the crown towards the case to set the hands rather than what we are commonly used to.

 

Tom

I figured it out. It is similar to modern systems. The tab must lock into the stem so that when pulled it moves the spring forward along with the clutch so that it engages the setting pinion. I was confused because it seemed the angle of attack to th spring seemed unworkable.

2 hours ago, JohnR725 said:

Typically it's not a problem if you're missing one  tooth.

But you could pretend that this is a clock gear and I take a quick look at YouTube and the first video I saw was well just skip over how bad the photography what's so looking for something that did not involve poorly filmed moving pictures and here is a classic of replacing a gear tooth you should be able to apply the same principle here other than it's a steel wheel and that might make things more interesting. In particular the type of solder you're going to use this is where perhaps some sort of localized welding might be nice I don't suppose you have a laser welder?

https://mb.nawcc.org/threads/how-to-make-a-dovetail-for-replacing-a-wheel-tooth.106329/

 

Looks like a fun thing to try.

LittleWatchShop Distinguished Member

LittleWatchShop

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1 hour ago, nevenbekriev said:

This thread has answers to what You ask, it is long but interesting.

https://www.watchrepairtalk.com/topic/30710-my-2nd-attempt-at-making-a-balance-staff/page/2/

Great thread. As part of my lot buy, I got a bunch of wheel cutters. I checked and one appears to have the correct profile. I have a servo driven rotary table on my Sherline mill. I can dial up the necessary rotation angle.

As luck would have it, I found a ratchet wheel in a bottle of ratchet wheels!! Imagine that!! I may still attempt a repair.

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