If You Have Found it Hard To Find Lathe Gear , This is The Place For You!
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 legacy Model 1000 turn Spirals tapers11wx84l Flute or bead  US $750.00
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 64 Tooth Change Gear Logan 200 10 Metal Lathe Wards US $37.00
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 72 Tooth Change Gear Logan 200 10 Metal Lathe Wards US $37.00
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 GRIZZLY G4002 12 x 24 Gear Head Cam Lock Spindle Gap Bed Lathe US $2,200.00
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 Barracuda2 Key Chuck System W 4 set of Jaws CSC3000C US $190.95
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 Atlas 10 Craftsman 12 Lathe 32T Tooth Change Gear US $18.00
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 Atlas 10 Craftsman 12 Lathe 46T Tooth Change Gear US $18.00
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 Atlas 10 Craftsman 12 Lathe 54T Tooth Change Gear US $18.00
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 Atlas 10 Craftsman 12 Lathe 64T Tooth Change Gear US $18.00
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 Atlas 101 Craftsman 618 Lathe 32T Tooth Change Gear US $18.00
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 Atlas 101 Craftsman 618 Lathe 36T Tooth Change Gear US $18.00
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 Atlas 101 Craftsman 618 Lathe 44T Tooth Change Gear US $18.00
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 Atlas 101 Craftsman 618 Lathe 46T Tooth Change Gear US $18.00
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 Atlas 101 Craftsman 618 Lathe 52T Tooth Change Gear US $18.00
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 Atlas 101 Craftsman 618 Lathe 54T Tooth Change Gear US $18.00
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 12 Pairs Premium Grade Golden Chore Monkey Face Cotton Gloves Size Large US $24.99
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 BRAND NEW JET HOBBY LATHE JHL 610 321200 US $799.00
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 Craftsman 12 Metal Lathe Mdl 10128991 Oper Manual US $9.50
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 Work Sharp WSSA0002780 Belt Sharpening System Attachment US $71.87
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 Clark 16 x 40 Precision Gap Bed Lathe US $8,999.00
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 Work Sharp WSSA0002780 Belt Sharpening System Attachment US $71.88
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 Crown 16 Oz Cutting Oil US $76.36
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 Steel Arrow Fastener Extra Heavy Duty Hammer Tacker Tools Home Improvement Ne US $112.27
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 DUNLAP CRAFTSMAN 1090703 54 T GEAR A 3249 US $23.00
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What is the gear ratio in lathes while thread cutting ?
I'm a little rusty on that, since I haven't done it in 30 years, but I remember well enough to tell you, that is going to vary depending on what thread pitch you want to cut.
Basically, if you want a 24 t.p.i. cut, the lathe is going to have to spin 24 times for each inch that the bit travels.
Let's say, just for example, that your lead screw is 8 t.p.i. Your lathe head is going to have to spin 3 times as fast as your lead screw to get 24 t.p.i. If you want 32 t.p.i., it would have to be a 4 to 1 speed ratio.
The speed ratio would be inversely proportional to the gear ratio. To have the chuck go 3 times as fast, you would need a gear with 3 times as many teeth attached to the lead screw. Of course, compound gears complicate this a little more.
Here are a couple good articles on how to calculate the gear ratio for any particular machine, that I found on a quick Google search;
http://www.schsm.org/html/gear_ratio_calculations.html
http://mini-lathe.org.uk/threading1.shtml
and a gear chart from an actual machine;
http://www.mini-lathe.com/Mini_lathe/Reviews/Big_dog/tpi01.jpg