Power Feed - Grizzly G4003G Owner's Manual

Configuration Example
Figure 62 shows the levers positioned for a
spindle speed of 600 RPM.
Note: If the spindle speed levers do not easily
adjust into position, rotate the spindle by hand
while you apply pressure to the lever. When the
gears align, the lever will easily move into place.
If you have trouble rotating the spindle by hand,
you can use the spindle key or a chuck key to get
additional leverage—just be sure to remove the
key when you are done.
Alpha
Lever
Set to "C"
I
270
A
70
B
200 1000
C
Figure 62. Setting the spindle speed to 600
RPM.
-48-
Numeric
Lever
Set to "III"
II III
1400 800
360 220
600

Power Feed

Both the carriage and cross slide have power feed
capability when the carriage is engaged with the
feed rod. The rate that these components move
per revolution of the feed rod is controlled by the
quick-change gearbox lever positions and the end
gear configuration.
The feed per revolution and the spindle speed
must be considered together—this is the feed
rate. The sources you use to determine the opti-
mum spindle speed for an operation will also
provide the optimal feed to use with that spindle
speed.
Often, the experienced machinist will use the
feeds and speeds given in their reference charts
or web calculators as a starting point, then make
minor adjustments to the feed rate (and some-
times spindle speed) to achieve the best results.
The carriage can alternately be driven by the
leadscrew for threading operations. However, this
section only covers the use of the power feed
option for the carriage and cross slide compo-
nents for non-threading operations. To learn how
to power the carriage for threading operations,
refer to Threading on Page 52.
If the feed selection lever and the half nut
are engaged at the same time, machine
damage could occur. Even though there is
a lock-out device to prevent this, it could
break if forced.
Model G4003G (Mfd. Since 1/15)