My Kerry lathe, whilst it has a gearbox, needs a pair of gears changed to convert from imperial screw threads to metric. Of course the lathe came without those gears so I need to meaurse the imperial ones and either buy or make some new ones. My problem is how do I measure acurately the current gears to know what DP to get? I don't have a gear vernier so can someone tell me what t do to?
Many Thanks
Charles