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Harrison 140 lathe question

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Ian.C:
Hi everyone, I wonder if anyone can tell me what thread the adjusting/leveling screws are as I need to tap out the rather crusty threads on my new toy, the lathe didn't come with the screws! I have measured the diameter of the bolts and found 21.9mm and 3mm pitch-ish but I would have thought they would been imperial. It is a metric lathe though?

awemawson:
Hi Ian welcome !

Can I suggest that if you are going to be using your new lathe much it's worth while investing is a screw pitch gauge. They are cheap as chips and will serve you well for years to come identifying threads - you'll need a caliper gauge as well to measure the diameter accurately.

philf:
Ian,

It's possibly 7/8" BSW which is 9 TPI (2.822mm Pitch) You did say 3mm-ish.

Phil.

Ian.C:
Hi Phil,

Thanks a lot for that, I didn't think the thread would be metric - I have ordered a set of imperial pitch gauges, I only had a metric set. I will report back.

micktoon:
Hi Ian, yes I can confirm 7/8 Whitworth threads on the levelling bolts.
  Cheers Mick  :thumbup:

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