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Which way to turn out ratchet wheel screw?

szbalogh

By szbalogh
in Watch Repairs Help & Advice

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I would also guess anti clockwise, I presume the screw head only has one slot in it and not any other lines across the head to indicate it is the other way?

Have you tried sitting the screw head back on top of it and pressing down with a screwdriver to try and unscrew it, sometimes it will bite and unscrew, make sure you check and correct the barrel arbor end shake in the barrel though afterwards and the end shake between the jewels because both could be altered a bit messing about with it.

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Geo Distinguished Member

Geo

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32 minutes ago, vinn3 said:

if the  head is snapped off,  it  was turned the wrong way.  best cosult a jeweler.

It may have been turned the wrong way, but it might also have been over tightened to the point where the screw had been stretched beyond its elastic limit and the head snapped off.  It may also have been rusted in and the head broken off when attempting to unscrew it.

If you do take it anywhere for advice, take it to a watchmaker not a jeweller.

If you study the break with a high power loupe, you might just see what direction the thread is.

My money is on it being a right hand thread because there is no need whatsoever for it to be left hand.  I say this because the ratchet wheel is fitted onto a square and therefor cannot rotate in any direction relative to the arbour to impart a slackening effect to the screw.

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szbalogh Super WRT Addict

szbalogh

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Ok, here is my best picture of the screw:

Snapshot60.jpg

Seems a normal thread to me.

I was drilling and grinding all day long and my Frankenstein lathe is born :)

2016-04-30 17.38.15.jpeg

Now i can mount the barrel arbor for turning:

2016-04-30 17.39.39.jpeg

First i will try to turn out the remaining screw with my graver. If it wont work i can make a center hole for drilling. Or sgould i make a 0.2mm cut in the arbor head and with that in the screw and try to screw it out? What method would You choose?

 

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bobm12 Distinguished Member

bobm12

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How about dipping in some oil (3 in 1 or something) and later scraping with the needle? Would it work? Any way to use the lathe (the new awesome one you just created?) while scraping with the needle? Just a though...

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szbalogh Super WRT Addict

szbalogh

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1 hour ago, bobm12 said:

How about dipping in some oil (3 in 1 or something) and later scraping with the needle? Would it work? Any way to use the lathe (the new awesome one you just created?) while scraping with the needle? Just a though...

I did it just like that :) Unfortunately it didnt came out. Finally one size bigger microdrill (0.9mm) did the job. However, the first 3-4 threads are now about half hight. Bu who cares, there are a lot more under it, i just need a longer crew. 

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