These tables complement the article "Universal Thread Cutting on a Mini Lathe" by Neil Wyatt in Model Engineers' Workshop issue 204.
As published, the tables were for lathes with 16 t.p.i. and 1.5mm pitch leadscrews, as that covers the majority of mini-lathes. Some mini-lathes have 2mm pitch leadscrews, and extra tables for such lathes are included here.
Note that these are not necessarily practical in all cases, and a few variations have been found that work better (usually swapping the order of gears to avoid clashes). The tables have not been amended to reflect this, but should provide a good starting point for anyone wishing to use a 63-tooth gear to convert between metric and imperial systems.
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