Gear Charts For Screw Cutting - Clarke MetalWorker CL300M Operating & Maintenance Instructions

GEAR CHART FOR CUTTING IMPERIAL THREADS
Threads
Per Inch A B
12 40
13 40
14 40
16 40
18 40
19 40
20 40
22 40
24 40
26 40
28 20
32 20
36 20
38 20
40 20
44 20
48 20
52 20
Examples:
1. Ref. Fig A on page 19.
To cut 12 TPI, use
2. Ref. Fig B on page 19.
To cut 38 TPI, use
Gear
C D
65 - 30
65 60 30
65 - 35
65 - 40
65 - 45
50 60 57
65 - 50
65 - 55
65 - 60
60 - 65
65 - 35
65 - 40
65 - 45
50 60 57
65 - 50
65 - 55
65 - 60
60 - 65
40T in position A,
30T in position D,
use the 65 tooth gear in position B to connect A and D.
20T in position A
50T in position B
60T in position C
57T in position D
21
INDICATOR TABLE
TPI SCALE
12 1,3,5,7
13 1
14 1,5
16 1~8
18 1,5
19 1
20 1,3,5,7
22 1,5
24 1~8
26 1,5
28 1,3,5,7
32 1~8
36 1,3,5,7
38 1,5
40 1~8
44 1,3,5,7
48 1~8
52 1,3,5,7
1~8 indicates that any of the
8 lines may be used.