25
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 table shows the gears to use for various common threads per
inch.
Threads
per inch
A B
C
D
12
40 Any Any 30
13
40 65
60
30
14
40 Any Any 35
16
40 Any Any 40
18
40 Any Any 45
19
40 50
60
57
20
40 Any Any 50
22
40 Any Any 55
24
40 Any Any 60
Threads
per inch
A B
C
D
26
40 Any Any 65
28
20 Any Any 35
32
20 Any Any 40
36
20 Any Any 45
38
20 50
60
57
40
20 Any Any 50
44
20 Any Any 55
48
20 Any Any 60
52
20 Any Any 65
D
C
B
B
A
A
