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What's the best way to true a Centre wheel ?

mikepilk

By mikepilk
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mikepilk Distinguished Member

mikepilk

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I have a distorted centre wheel on an old Roamer MST372

I can use the staking set to make sure the pinion is at 90 deg, but what's the best way to flatten the wheel ? 

A really big hollow staking tool would do it !

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Edited by mikepilk
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JohnR725 Distinguished Member

JohnR725

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What you need is a Truing Caliper. The link below has pictures and talks briefly about using them. The problem with the center wheel and especially if that's a pocket watch the pivots are really big. So very likely are going to have to modify the end to hold a bigger pivot.

http://watchmakingblog.com/2008/06/10/tuesday-tools-truing-calipers/

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mikepilk Distinguished Member

mikepilk

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1 hour ago, JohnR725 said:

What you need is a Truing Caliper. The link below has pictures and talks briefly about using them. The problem with the center wheel and especially if that's a pocket watch the pivots are really big. So very likely are going to have to modify the end to hold a bigger pivot.

http://watchmakingblog.com/2008/06/10/tuesday-tools-truing-calipers/

I have some truing calipers -  I have trued pocket watch balances wheels with them.

The centre wheel fits in them OK. I may have bent it myself when fitting the cannon pinion.

I hold the centre wheel in place with one finger, and push the cannon pinion on with tweezers, probably not the best method ? 

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