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2.
determine the final diameter, in inches, for
the cut you intend to make.
Note: For this step, you will need to aver-
age out the diameters or work with the finish
diameter.
3.
use the following formula to determine the
correct spindle speed (rpM) for your opera-
tion:
*
Recommended
Cutting Speed (FPM) x 12
Dia. of Cut (in inches) x 3.14
*
Double if using carbide cutting tool
Example A:
you will finish cut a
of cast steel stock, using an hss cutting
tool.
Step 1:
150 (sFM from chart) x 4 = 600
Step 2:
600 / .5" (diameter of workpiece) = 1200
Result:
the correct spindle speed is 1200 rpM.
Example b:
you will rough turn a 1" diameter piece
of stainless steel, using a carbide cutting
tool.
Step 1:
60 (sFM from chart) x 2 (for carbide tool)
= 120
Step 2:
120 (Calculated sFM) x 4 = 480
Step 3:
480 / 1" (diameter of workpiece) = 480
rpM
Result:
the correct spindle speed is 480 rpM.
Model g0554z (Mfg 01/09+)
Spindle
Speed
=
(RPM)
⁄
" diameter piece
1
2
4.
Examine the chart in Figure 52 or on the
front of the headstock to determine the avail-
able spindle speed closest to your calculated
speed.
Note: When the calculated spindle speed
falls between the available speeds, use your
best judgement as to which speed to use.
SpEEDS
LEvERS
JLp
GLp
HLp
JLM
GLM
HLM
JKp
GKp
HKp
JKM
GKM
HKM
Figure 52. spindle speed chart.
5.
Make sure the spindle is turned OFF and it
has come to a complete stop.
6.
Configure the spindle speed levers as direct-
ed in the spindle speed chart. For instance,
the calculated spindle speed in Example A
is 1200 rpM, then the spindle speed levers
are configured for the nearest speed of 1280
rpM, as shown in Figure 53
Note: You may need to rock the spindle
back-and-forth by hand to get the gears to
properly engage.
G H J
Figure 53. spindle speed levers set for a speed
of 1280 rpM.
RpM
1800
1280
910
650
460
325
230
160
115
85
60
40
M 0 P
K
L
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