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Help with barrel arbor

measuretwice
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measuretwice WRT Addict

measuretwice

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I have a broken barrel arbor from a pocket watch, one of the early 20th century, low cost ones as far as I can tell.  As per the second photo, there is a square section broken off.  The section mates with a mechanism I believe limits the number of turns of the barrel.  I plan to make a new barrel arbor, I know the watch is cheap and probably not worth it, but its about building skills.

Anyway, my question is, would you at all expect that the larger diameter section with the tab for the spring is pressed onto the shaft? it sort of looks like it is, but a a few light taps didn't dislodge it.  It would make things a great deal easier if i didn't have to make that aspect of it.  Thanks in advance.

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AQ3jRyA.jpg

 

 

 

 

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jdm Distinguished Member

jdm

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6 minutes ago, measuretwice said:

I plan to make a new barrel arbor, 

Do you have a lathe and mill? Making such a small and complex part is a very advanced task for today's (low) standards of watchmaking.

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measuretwice WRT Addict

measuretwice

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16 minutes ago, jdm said:

Making such a small and complex part is a very advanced task

We'll see, no promises, but it seems a fairly straight forward turning job (famous last words, right?)  Its smaller than I'm used to, but I've lots of lathes and mills and time on them and its a lot larger than stuff like balance staff pivots.

Any idea if this part comes apart?

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rogart63 Distinguished Member

rogart63

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If it's pressed on it probably is pressed on by heating one of the parts and the other one is cold. Making a very tight fit. No idea how to remove them thought. 

Todays watchmakers is probably not into making parts like this but the machines of today

 would be much better.  

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Lambchop Member

Lambchop

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@measuretwice The barrel arbor hooking isn't pressed on- it is machined integral to the piece.. don't pick at it any further! This piece would take a GOOD couple of hours to draw up, machine, modify to fit,  heat treat and polish. 

@jdm Yes- me! 12 yrs working with Schaublin 70's (alongside other nice machinery) every day as a precision prototype engineer for industry.  (also an MBHI watchmaker)

 

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jdm Distinguished Member

jdm

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1 minute ago, Lambchop said:

 

@jdm Yes- me! 12 yrs working with Schaublin 70's (alongside other nice machinery) every day as a precision prototype engineer for industry.  (also an MBHI watchmaker)

Will love to see your work posted here! So far the only one that consistently does that is szbalogh, and he doesn't even have a lathe!

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clockboy Distinguished Member

clockboy

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12 hours ago, jdm said:

Do you know of many watch repairers that do lathe work these days? Or even on this forum?

I have a lathe (Star) but not a milling machine. Not many members have lathes because of the extra space required. There are however plenty of watchmakers who still make watch parts, balance staffs etc. If you purchase a BHI mag in the ads section there are many offering their services.

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jdm Distinguished Member

jdm

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37 minutes ago, clockboy said:

There are however plenty of watchmakers who still make watch parts, balance staffs etc. If you purchase a BHI mag in the ads section there are many offering their services.

That must be in the UK, a country that is ahead when it comes to small manufacturing and services. In my country I've seen "watch repairers" not taking work that consisted in pushing out a broken bracelet pin from a Swiss watch. As mentioned, this is an age of replacing watch parts, if that much even. If this forum can teach and show otherwise, then it will become a real asset.

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oldhippy Distinguished Member

oldhippy

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There is a big difference between a watch repairer and a watchmaker. A qualified watchmaker providing he/she have the correct tools would be able to make the part. A qualified watch repairer would find it extremely difficult even with the tools.   

I learned my trade and became a watchmaker clockmaker. I was lucky the workshop was set up to make parts.

 

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measuretwice WRT Addict

measuretwice

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thanks for help, one piece it is.   From sure one piece makes the job more challenging.   I didn't mean to sound flippant on making it but I've been machining for a long time and have a lot of equipment so pretty much any part is just a matter of figuring out the sequence of events and work holding.  The challenge of this stuff is everything is so small which creates new challenges (perhaps why I'm attracted to it)

I've a small BCA mill/jig borer that would be ideal (has a built in rotary table), but its currently apart as I'm making a new spindle for it (hardened and ground with super precision bearings).  In the middle of that, the internal grinder needed a rebuild, then I felt the motor needed balancing so started working on an acelerometer based dynamic balancing thing, blah blah blah.  Story of my hobby life, make something to make something else in seemingly endless spiral.  But, its all just for fun and learning not money, else the part would most definitely not be worth it and I'd spend the weekend watching sports like normal people.

I'll either wait until the BCA is done, or make a small collet block to take 8 or 10 mm collets and set it up on a rotary table on a full sized mill.  Thanks again for the help!

 

 

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