Inch Threading - Grizzly G4015Z Owner's Manual

Inch Threading

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.
1
N
Inch
D
24 27
A
I
8 9
2
75
II
16 18
I
24 27
25
II
48 54
3
Figure 44. Rates given in millimeters and inches.
The column of numbers to the right of D rep-
1.
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.
Field of possible thread pitches.
3.
The gear used in position B and C will
4.
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.
-36-
B=125
A
B
C
C=127
D
30 33 36 42 48 60
16 20
10 11 12 14
20 22 24 28 32 40
30 33 36 42 48 60
96 120
60 66 72 84
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.)
4
Figure 45. 75 tooth gear installed at "A".
G4015 Lathe/Mill