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(08-06-2015, 03:20 AM)Steinmann Wrote: It is an imperial machine and I would like to convert here to metric. Is it possible?
Did you have any change wheels with the purchase a 127, 60, and 40 tooth is required for metric conversion if I remember correctly.
What wheels are under the head cover.
Trev
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Well, at the moment there are mounted in the gear 25T, 80T and 100T.
It also came with 50T, 60T, 63T and 127T stored, oiled and wrapped.
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The 127 tooth gear is the important ingredient in cutting metric threads on an imperial machine- being the lowest whole multiple of 25.4 which of course is mm to inch. Was missing from my lathe when I bought it and I made a 100km round trip to the previous owner to get it- only to find it had been lost!
Not the same as converting the whole machine to metric, if by that you mean the feed dials etc but that would be an impractical task. Looks like a nice lathe you have, I'm sure you will enjoy it. There may be a chart on the machine showing the arrangement of the change gears for the various thread pitches.
Lathe (n); a machine tool used in the production of milling machine components.
Milling Machine (n); a machine tool used in the production of lathe components.
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The following 3 users Like dallen's post:
EdK (08-08-2015), Mayhem (08-08-2015), DaveH (08-08-2015)
to change the feed dials to metric just putting a DRO on it, will probably be cheaper and more accurate
dallen, proud to be a member of MetalworkingFun Forum since Apr 2012.
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Harrisons are nice machines. Ya done good!
You may want to see if you can get a 127 tooth gear from Boston Gear or a similar mass manufacturer. All you should have to do is bore it and cut the keyway. As to converting it to metric I agree that a DRO is the way to go.
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American Metric (ametric.com) is another good source for gears.
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he has the 127 tooth gear
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