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2.
determine the final diameter, in inches, for
the cut you are about to take.
Note: For this step you will need to aver-
age out the diameters or work with the finish
diameter for your calculations.
3.
use the following formula to determine the
needed rpM for your operation:
(Cutting speed x 4)/diameter of cut = rpM
4.
With the calculated rpM, examine the spin-
dle speed chart in Figure 49 or on front of the
headstock, to find the closest match.
Note: In most cases you will need to make a
judgement call on which way to go with the
RPM.
5.
Make sure the spindle is completely stopped
before proceeding.
6.
Move the spindle speed selectors (Figure
50) to the appropriate rpM setting. refer to
Figure 49 for available rpM and the selector
combinations.
Note: You may need to rotate the spindle by
hand to get the levers to properly engage.
SpEEDS
LEvERS
JLp
GLp
HLp
JLM
GLM
HLM
JKp
GKp
HKp
JKM
GKM
HKM
Figure 49. rpM chart.
g0554 gear-head Floor lathe
Figure 50. spindle speed selectors shown set at
RpM
1800
1280
910
650
460
325
230
160
115
85
60
40
1280 rpM.
-35-
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