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Jacot tool and pivot file burnisher question

clockboy
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JohnR725
JohnR725

Thinking about a perfect finish here's an interesting PDF to read. A Quick Evaluation of Surface Finish of Pivots.pdf

luiazazrambo
luiazazrambo

I have recently used a jacot tool to successfully re-polish a badly worn pivot in a pocket watch the first time in my life. I have watched Richard's videos about it and I also went to a book printed i

rodabod
rodabod

The burnisher removes a small amount of material. But that is not it’s purpose. It’s purpose is two-fold. It folds over the surface grains of metal which makes them smooth and achieve a polish. So thi

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jdrichard Distinguished Member

jdrichard

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This site should help you it will save me typing it all out.[emoji3]You don't use gears, all that you need is in the box apart from the bow, or is the bow underneath the tool.

http://www.horo-logical.co.uk/jacot.html


Thanks. The only question I have left is how the gear does not slip out of the female end that receives the pivot that is not being worked?


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Geo Distinguished Member

Geo

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When adjusted correctly for the the pivot you're about to burnish, the shoulder on that end of the shaft will just touch the Jacob drum and prevent the shaft from moving laterally.  The downward pressure from the burnisher will keep the pivot in place during the burnishing operation.

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jdrichard Distinguished Member

jdrichard

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When adjusted correctly for the the pivot you're about to burnish, the shoulder on that end of the shaft will just touch the Jacob drum and prevent the shaft from moving laterally.  The downward pressure from the burnisher will keep the pivot in place during the burnishing operation.


OK, that makes sense. Time to practical on old Russian watch pivots:)


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jdrichard Distinguished Member

jdrichard

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Great video JD . Have an old one i bought at an auction. Cheap. looks okay but wonder how i change the hole in part that holds the wheel. Is there different inserts? Or should it only be held in the pivot? 

 

Everything I have read says that the hole is tapered to accept any male pivots. So no change required. As well, where the pivot transitions into the shift is where the business end is stopped by the resting groove; so the pivot won't fall out of the tapered female hole on the other end. Pressure from the file or burnishing file also keeps the pivot in the slot. Cool

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dadistic Distinguished Member

dadistic

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14 hours ago, jdrichard said:

Figured it out and made a video
 

Oh man, now every one can see how to use one, they're all going to want one, and the prices for used ones are going to go through the roof! :)

Anyhoo, thanks a bunch for the video.

 

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Geo Distinguished Member

Geo

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On 29/10/2016 at 10:37 AM, oldhippy said:

You can buy a burnishing tool just be careful and make sure you get the one for you as they come left or right handed. Needle files are also used for reduction.

Could you please clarify?  What exactly is the difference between a left and a right hand burnishing tool?

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oldhippy Distinguished Member

oldhippy

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A right-hand burnisher will allow the clock-maker to burnish the pivot from underneath

with the piece being held and rotated from their left.  A left-hand burnisher will allow

burnishing from underneath while being held on the right.  If the preference is to burnish from over-the-top, a left-hand burnisher is used with the piece being held on the left and a right-hand burnisher with it held on the right.  This can add confusion as to which burnisher to purchase.  Since most machinists will machine with the piece being held in a lathe head stock on their left whether they are right- or left-handed, it should first be decided whether burnishing will be done from underneath or over-the-top.  

 
e-top.
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jdrichard Distinguished Member

jdrichard

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  A right-hand burnisher will allow the clock-maker to burnish the pivot from underneath



with the piece being held and rotated from their left.  A left-hand burnisher will allow

burnishing from underneath while being held on the right.  If the preference is to burnish from over-the-top, a left-hand burnisher is used with the piece being held on the left and a right-hand burnisher with it held on the right.  This can add confusion as to which burnisher to purchase.  Since most machinists will machine with the piece being held in a lathe head stock on their left whether they are right- or left-handed, it should first be decided whether burnishing will be done from underneath or over-the-top.  

  e-top.

I purchased a combined burnisher and pivot file from cousins UK at about 90 bucks and I made sure I could hold it with my left hand on top and turn the pivot (in the jacot) with my right hand. Meaning the rounded part of the tool is on the bottom right to confirm with the slope of the pivot for balance staff pivots.


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