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G4015 Lathe/Mill
Figure 45. 75 tooth gear installed at “A”.
The Model G4015Z is capable of cutting many
standard inch and metric threads. Follow the pro-
cedures listed in Changing Gears in the previous
section and change the gears according to the
chart for the thread desired. Figures 45 - 48
show the order the gears should be installed. This
example shows gearing for cutting a 10 or 20
thread per inch (tpi) screw thread. (The Feed
Rate Lever set to the I position will allow 10 TPI.
When the lever is set to the II position, 20 TPI will
be cut.)
Inch Threading
A
B
C
D
75
24
27
30
33
36 42
48
60
8
9
10
11
12 14
16
20
16
18
20
22
24 28
32
40
24
27
30
33
36 42
48
60
48
54
60
66
72 84
96
120
25
Inch
I
II
I
II
A
D
B=125
C=127
N
The inch threading gear chart is illustrated in
Figure 44. The layout is listed below to help iden-
tify the gears needed for cutting threads with inch
pitches. The chart lists pitches in threads per
inch.
Figure 44.
Rates given in millimeters and inches.
1. The column of numbers to the right of D rep-
resent the number of teeth on gears used in
position D.
2. The numbers below A represent the number
of teeth on gears used in position A. In this
case 25 or 75 teeth.
3. Field of possible thread pitches.
4. The gear used in position B and C will
always be the 125/127 combination gear.
The 125 tooth gear will need to be oriented
so it is in mesh with the gear in the A posi-
tion.
1
3
2
4