VDFLathe

I have this VDFlathe it is a V 1 Boeringer, quite old but in good nick.However I do not understand the purpose of the gear/s with the numbers on it. The lathe can cut Metric, Imperial and Modular threads it has a 8tpi leadscrew.Here is a link to a photo of the gear/s

formatting link
Can anyone help?

Thanks Dick Ellis

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rchrd.ellis1
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