Power Feed; (Non-Threading) - Grizzly G4000 Owner's Manual

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
Rough
Cutting 90
Speed SfM
Rough feed 0.010" to
Rate ipR
0.020"
finish
Cutting 120
Speed SfM
finish feed 0.003" to
Rate ipR
0.005"
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.
-38-
High Carbon
Normalized
Annealed
Allow Steel
Steel
50
0.010" to 0.010" to
0.020" 0.020"
65
0.003" to 0.003" to
0.005" 0.005"
figure 53. hss cutting speed and feed rate table.
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).
Aluminum
Alloys
45 200
0.015" to
0.030"
60 300
0.005" to
0.010"
Model G4000 (Mfg. Since 8/09)
Cast iron Bronze
70 100
0.010" to 0.010" to
0.020" 0.020"
80 130
0.003" to 0.003" to
0.010" 0.010"