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OLD LATHE
celsoari:
--- Quote from: Pete. on November 11, 2019, 03:10:01 PM ---
--- Quote from: celsoari on November 11, 2019, 11:17:20 AM ---
--- Quote from: Pete. on November 10, 2019, 09:29:50 AM ---You're doing fine with your English Celso.
If it's a 8tpi screw it's less likely to be of German origin.
What tooth counts do all your other gears have?
--- End quote ---
have 16, 18, 32,32, 44, 48,52,56, 60,64,72,80,90,100,127 t.
--- End quote ---
Ah, now you're talking. You can do metric threads with the 127 tooth gear.
One more question. There is a gear behind the one marked in green. Should be 26 teeth. Can you confirm this?
--- End quote ---
yes there is behind a 26 teeth gear too
Pete.:
Cool, looks like you're off to a good start. Let me see what threads you can cut with your current selection.
In this pic you have a gear on the leadscrew. There should be a spacer behind it that you can remove to have the spacer either in front or behind the gear. Can you swap these around as shown by the arrows?
celsoari:
--- Quote from: Pete. on November 11, 2019, 04:34:29 PM ---Cool, looks like you're off to a good start. Let me see what threads you can cut with your current selection.
In this pic you have a gear on the leadscrew. There should be a spacer behind it that you can remove to have the spacer either in front or behind the gear. Can you swap these around as shown by the arrows?
--- End quote ---
yes I can swap them back and forth by changing the position of the spacer and gear.
celsoari:
I suspect this lathe is a Portass. There are some similarities. The cover of the reduction train gears are identical. The support of flat pulleys is also identical.
however the bed and feet are quite different.
Pete.:
Okay, using the program nthreadp from here it looks like you can get most of the common imperial and metric threads with the gears you have got. The only really common one you can't get is 1.75mm pitch (which is the pitch for M12 coarse).
The threads you can't get are in red. Those threads need additional gears (missing option in red also)
Where it says I you can put any gear that will fit, as it just need an idler to fill the gap. For this you have to swap the spacer on the screw gear to the front so it's a simple gear train not compounded.
EDIT:New MM chart uploaded to remove errors. I've had to change it due to finding some errors but it's fully checked now and correct.
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