-40-
Model g0554z (Mfg 01/09+)
power Feed
power feed on the Model g0554z uses the
machine to move the tooling rather than manual
rotation of the handwheels. When the feed rod
is engaged, the carriage or cross slide moves.
threading operations use powered rotation of the
longitudinal leadscrew with the half-nut engaged.
the feed rate that these components travels is
set with the feed rate lever/knobs and the quick
change gears, but it is also dependent upon the
spindle speed.
the correct feed rate and the related spindle speed
is determined by the material to be machined, the
type of tooling used, the depth of cut, and the
desired finish. refer to the table in
Figure 54 or
the
Machinery's Handbook
for guidelines.
Note:
This chart provides the cutting speed (SFM)
for a given feed rate. You must use the cutting
speed with the formula on
Page 39
to calculate
the correct 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 54. hss cutting speed and feed rate table.
understanding the Feed Rate &
Threading charts
Examine the Model g0544z feed rate and thread-
ing charts in
Figure 55 on page 41. these charts
show the various configurations of the feed rate
lever/knobs and the quick change gears.
the top chart shows the settings for longitudinal
and cross power feed and for inch threading. the
bottom chart shows the settings for metric thread-
ing.
understanding these charts is crucial to correctly
setting the lathe controls for the required feed
rate.
NOTICE
ALWAyS make sure the spindle is turned
OFF
and is at a complete stop before
changing any gear configuration to prevent
damage to the lathe gearing and voiding the
warranty.
