Just pick one big enough to physically mate with the headstock without worrying about how many teeth it has. As a gear used that way doesn't alter the ratio, you can use any gear. I think Les means that the 30 tooth gear is used only to transfer rotation from the headstock to the other gears. No Les the spacer is for locking the 30T gear to the 'banjo' spindle.The 30T gear drives the 50T wheel from the headstock.Ī picture would help. If the 30 tooth is only a spacer then it has no effect on the ratio so just use a larger gear to make up the space between the headstock gear and the 50 tooth gear. Am I missing something fundamental? The lathe is the metric one. The problem is that the 30T gear is no where near the headstock gear. I fitted the change wheels as per the chart supplied ie starting from the top spacer,30T driving a 50T with a 45T on the outside driving an 85T on the leadscrew with a spacer on the inside. Hi all, I have been trying to set my WM250 lathe up to cut a 20TPI thread.
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