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Burnishing Pivots and What it Does

jdrichard

By jdrichard
in Watch Repairs Help & Advice

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oldhippy Distinguished Member

oldhippy

Posted
Posted

Yes it does, but not enough to endanger the fitting of the pivot into the hole. Burnishing removes the faint marks left in the steel after turning/alteration due to wear or cutting a new pivot. It creates an extremely fine finish, like a mirror finish. It also helps in the rotation of the pivot, preventing it from binding in the hole. If you gauged before and after I don’t think it would change, providing the work has been carried out correctly.

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nickelsilver Distinguished Member

nickelsilver

Posted
Posted

It does remove (and compress) material, but it could be just a micron or two to several hundredths or more. Burnishers as used on pivots always have a straight grain texture, this is in effect a micro file. When burnishing on a Jacot tool you are removing a small amount of material as well as work hardening it. It does increase the wear resistance of a pivot. When I make a balance staff I generally leave the pivots 0.01-0.02mm oversize and bring them down to final size in the Jacot tool.

Pip WRT Addict

Pip

Posted
Posted

I always understood that burnishing moved material rather than removed it. Is that not right?


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