Grizzly G9249 - Manual (Page 39)

g9249 12" x 37" Belt drive gap Bed lathe
-37-
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
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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.
figure 54. Feed rate selectors.
letter indents number indents
3. refer to the table in figure 53 and find the
value closest to your desired feed rate either
in millimeters per revolution (top values) or in
inches per revolution (bottom values).
Note: This table is also on the bottom of the
label to the left of the feed rate selectors.
4. 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.
mm
120
127 40
40
127 40
120 120
32 32
30 127
1 4 6 1 6 1 4
A
B
C
D
E
METRIC THREAD TABLE
INCH THREAD TABLE
6 4.8 4 7.5 5 4.5
3 2.4 2 2.5 2.25 1.8
1.5 1.2 1 1.25 0.9
0.75 0.6 0.5 0.45
0.3 0.25
3.75
T.P.I.
127
32
30
A B C D E
127
32
46 1 3 /
4
11 1 /
2
3 3 /
4
7 1 /
2
23
15
46 92
30 60
FEEDING TABLE mm /
inch
127
40
40
D
E
1 2 3 4 5 6 7 8
.42 .37 .35 .33 .30 .28 .26 .24
.0165 .0146 .0138 .0131 .0120 .0110 .0101 .0094
.210 .185 .175 .165 .150 .140 .130 .120
.0082 .0073 .0069 .0065 .0060 .0055 .0050 .0047
figure 53. Feed rate table.
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.