Grizzly Gear-Head G9036 - Manual (Page 36)

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Model g9036 Mfg. 7/08+
4. With the calculated spindle speed, examine
the spindle speed chart on the front of the
headstock to find the closest match.
note: In most cases the calculated spindle
speed will be between the available speeds.
Use your best judgement when choosing
either a higher or lower spindle speed.
5. Make sure the spindle is completely stopped
before proceeding.
6. Move the high/low lever shown in figure 50
to the range for your desired speed. typically
the spindle must be slightly rotated by hand
to allow the gears to engage when moving
the spindle speed levers.
note: If the High/Low lever is in the Neutral
position, the spindle will not spin when the
motor is turned
ON.
12
55
2
000 755
4
60 19
0
300 115
7
0
Low High
Neutral
High/Low
Lever
Speed
Selection
Lever
Pointer
figure 50. spindle speed levers; high/low lever
positioning.
example 1
you will turn
1 ⁄
2
" diameter piece of alumi-
num stock, using a hss cutting tool.
step 1:
300 (sFM from chart) x 4 = 1200
step 2:
1200 / .5" (diameter of workpiece) = 2400
rpM
result:
the correct spindle speed is 2400 rpM.
example 2:
you will turn a 1" diameter piece of stain-
less steel, using a carbide cutting tool.
step 1:
60 (sFM from chart) x 2 (for carbide tool) =
120
step 2:
120 (determined sFM) x 4 = 480
step 3:
480 / 1" (diameter of workpiece) = 480
rpM
result:
the correct spindle speed is 480 rpM.
3. use the following formula to determine the
needed spindle speed for your operation:
Cutting Speed (SFM) x 4
Diameter of Cut
Spindle Speed =
7. Move the speed selection lever, so the pointer
on the hub points to the desired speed setting
(see
figure 50).