LittleMachineShop.com HiTorque 5100, Руководство пользователя

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Change Gears
The series of gears that drive the lead screw are called change gears because
you change them to turn different thread pitches.
There are 4 positions for the change gears, commonly called A, B, C and D.
A This is the top change gear position. When you received your lathe it had
a 20 tooth metal gear in this position.
B Gear positions B and C are on the same shaft, between positions A and D.
Position B is the inside gear on this shaft. When you received your lathe it
had an 80 tooth plastic gear in this position.
C Gear positions B and C are on the same shaft; between positions A and C.
Position C is the outside gear on this shaft. When you received your lathe
it had a 20 tooth metal gear in this position.
D Position D is the end of the lead screw. When you received your lathe it
had an 80 tooth plastic gear in this position.
Changing these gears varies the speed that the lead screw turns in relation to
the speed that the spindle turns. This allows you to cut threads with different
numbers of threads per inch.
The following tables show the gears to use for various common threads.
D
C
B
B
A
A