Only the 127/120 gives "exact" metric threads on an inch lathe, or "exact" inch threads on a metric lathe. Commonly used sets of cluster gears for metric threads are shown in the table below. If a pair of gears is on a common shaft (ie, cluster), with previous gears driving one of them and subsequent gears being driven by the other, this tooth ratio must be multiplied in.ģ. The ratio is determined by the tooth counts of the first and last gears only. Headstock gears - If a series of gears is meshing with each other (ie, in a common plane), then intermediate gears don't affect the final ratio. The thread pitch will be a combination of both gear sets, plus the lead of the leadscrew.Ģ. I assume you have gears both in the headstock and in a QCGB (quick change gear box) just ahead of the leadscrew. But I'm going to get pretty basic and somewhat generic, just for the sake of completeness.ġ. Apologies if this is already known to you. You haven't posted any pictures of your lathe, and I know nothing else about it.
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