South bend SB1049, Manual

Page: 65 / 136

For Machines Mfg. Since 5/11 13" Heavy 13
®
Gearhead Lathe
-59-
O P E R A T I O N
1
⁄
4
or
3
⁄
4
Fractional TPI
For TPI that have a
1
⁄
4
or
3
⁄
4
fraction, use position
1 on the thread dial (see Figure 84).
2
7
⁄
8
TPI
The thread dial is not used for 2
7
⁄
8
or metric
threading, or diametral and modular pitches (see
Figure 85). The half nut must stay engaged with
the leadscrew throughout the entire threading
operation.
Figure 84. Position for
1
⁄
4
or
3
⁄
4
fractional TPI.
Position
1 Only 2¼,2¾,
3¼,3¾
TPI
Figure 85. Half nut stays engaged for 2
7
⁄
8
TPI.
2
7
∕
8
Same as
Metric
Threads
Thread Dial
Not Used
The chip drawer catches swarf and metal chips
during the machining process. It contains a
screen that prevents large chips from returning
to the reservoir with the run-off coolant and
causing damage to the pump.
Also, it slides open and is removable for cleaning
(see Figure 86).
Chip Drawer
Figure 86. Chip drawer.
The chip drawer is very heavy. Unless
removing the chip drawer for cleaning, do
not pull it out more than halfway; otherwise,
it could fall out and cause a crushing injury.
If removing the drawer for cleaning, get
assistance!