-38-
Model G4000 (Mfg. Since 8/09)
Note: These instructions are only valid for non-
threading operations. To configure the feed rate
for threading, refer to the
Threading subsection
on
Page 40.
To engage the power feed for non-threading
operations:
1. disConnECt LAthE FroM poWEr!
2. Examine the feed rate chart in figure 55 to
determine the necessary configurations for
the change gears and feed rate lever.
Note: The feed rate chart is also displayed on
the front of the headstock.
a. Find the desired feed rate on the bottom
row of the chart labeled
feed.
b. set the feed rate lever as directed by the
number at the top of that column on the
line labeled
Lever (refer to feed Rate
Lever on page 35 for detailed instruc-
tions).
power feed
(Non-Threading)
power feed on the Model g4000 simple means
using the machine-driven components to move
the carriage left or right along the workpiece
rather than manually rotating the handwheel.
the powered speed at which the carriage travels
is set with the feed rate lever and the change
gears, but it is also dependent upon the spindle
speed.
the correct powered feed rate of the carriage and
the spindle speed is determined by the material to
be machined, the type of tooling used, and by the
desired finish. refer to the table in
figure 53 or
the Machinery's Handbook for guidelines.
Note: This chart provides the cutting speed for a
given feed rate. You must use the cutting speed
with the formula on
Page 33 to calculate the cor-
rect spindle speed (RPM) for the chosen feed
rate.
Low Carbon
Steel
High Carbon
Annealed
Steel
Normalized
Allow Steel
Aluminum
Alloys
Cast iron
Bronze
Rough
Cutting
Speed SfM
90
50
45
200
70
100
Rough feed
Rate ipR
0.010" to
0.020"
0.010" to
0.020"
0.010" to
0.020"
0.015" to
0.030"
0.010" to
0.020"
0.010" to
0.020"
finish
Cutting
Speed SfM
120
65
60
300
80
130
finish feed
Rate ipR
0.003" to
0.005"
0.003" to
0.005"
0.003" to
0.005"
0.005" to
0.010"
0.003" to
0.010"
0.003" to
0.010"
SfM = surface Feet per Minute
ipR = inches per revolution
Note: These values are for HSS cutting tools. For carbide cutting tools, double the cutting speed. These
values still may need slight adjustment depending on the cutting tool rake and relief angles. Refer to the
MACHINERY'S HANDBOOK for more detailed information.
figure 53. hss cutting speed and feed rate table.
