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G0554 Gear-Head Floor Lathe
-35-
Figure 50. Spindle speed selectors shown set at
1280 RPM.
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.
Figure 49. RPM chart.
SPEEDS
LEVERS RPM
JLP 1800
GLP 1280
HLP 910
JLM 650
GLM 460
HLM 325
JKP 230
GKP 160
HKP 115
JKM 85
GKM 60
HKM 40