Setting Feed Rate - Grizzly G9249 Owner's Manual

Setting feed Rate

Feed rate is determined by the machined material,
the type of tooling used, and by the desired finish.
refer the table in figure 52 or the Machinery's
Handbook for guidelines.
Note: These instructions are valid only for feed
rod power feed. Feed rate configuration for thread-
ing is discussed in the Threading subsection
starting on Page 40.
Recommended Feed Rates
Rough Cuts
Note: These values are a guideline only. Refer
to the MACHINERY'S HANDBOOK for more
detailed information.
figure 52. Feed rate table .
To set the feed rate:
1.
use the spindle direction lever to turn the
spindle OFF, then allow the spindle to com-
pletely stop before making gear changes.
2. Make sure the change gears are in the con-
figuration 40t/127t/40t, as illustrated in
figure 53 (refer to change Gears on Page
38 for detailed instructions).
Note: The Model G9249 ships with the
change gears in the 40T/127T/40T configu-
ration, which will cover most feed rates and
inch threading.
g9249 12" x 37" Belt drive gap Bed lathe
3.
127
Finish Cuts
4.
letter indents
B
3 2.4 2 3.75
C
1.5 1.2 1
D
0.75 0.6 0.5
refer to the table in figure 53 and find the
E
0.3 0.25
value closest to your desired feed rate either
INCH THREAD TABLE
in millimeters per revolution (top values) or in
inches per revolution (bottom values).
A B
T.P.I.
32
1 / 11 /
Note: This table is also on the bottom of the 3 1
127
4
46
label to the left of the feed rate selectors.
32
3 / 7 /
3 1
127
4 2
30
FEEDING TABLE
1 2 3 4 5 6 7 8
40
.42 .37 .35
D
.0165 .0146 .0138 .0131 .0120 .0110 .0101 .0094
.210 .185 .175
E
40
.0082 .0073 .0069 .0065 .0060 .0055 .0050 .0047
figure 53. Feed rate table.
pull the knob of the feed rate selector and
rotate it down. line up the selector with the
desired indent, rotate the selector up, and
allow the pin to engage into the indent (see
figure 54).
Note: It may be necessary to jog the spindle
to facilitate movement of the selectors.
figure 54. Feed rate selectors.
for Example: The operation is a shallow
finish cut on an aluminum workpiece. The
chart in Figure 52 recommends a feed rate
of 0.005–0.100 IPR (inches per revolution).
Because this is a shallow cut, we could select
a feed rate of 0.0082 IPR. To set this feed
rate, seat the left feed rate selector in the
"E" indent, and the right selector in the "1"
indent.
2.5 2.25 1.8
1.25 0.9
0.45
C D E
23 46 92
2
15 30 60
mm
/
inch
.33 .30 .28 .26 .24
.165 .150 .140 .130 .120
number indents
-37-