Author Topic: tapped wires in tracker action  (Read 1480 times)

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Richard Warren

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tapped wires in tracker action
« on: July 31, 2016, 12:57:20 PM »
silly question but what thread is used on the tapped wires in tracker action. I'm currently doing a rebuild/ enlargement of an instrument and am struggling to find the correct thread. I've tried some modern M sized threads but they're much too fine.
any help would be appreciated.

regards

David Wyld

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Re: tapped wires in tracker action
« Reply #1 on: August 01, 2016, 01:42:38 PM »
The thread isn't 'cut'  it's 'rolled',  therefore there is no machine-thread tap available to do this,  it has to be done using a thread rolling machine.

If you take a vernier or micrometer to an existing wire end,  note that the plain section is actually thinner than where the thread is thrown up: the action of rolling pushes out the metal to raise the thread - therefore a 16-guage wire (standard wire gauge)  has a threaded part which is nearer to 15 or 14 gauge,  dependent on the pressure which is exerted by the machine.

DW

Richard Warren

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Re: tapped wires in tracker action
« Reply #2 on: August 02, 2016, 01:18:49 AM »
many thanks
that's cleared that one up
more tooling required for the job in hand
regards
RW

 


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