Grizzly G0554Z Example a, Step, Result, Example B, 1800, 1280, 910, 650, 460, 325, 230, 160, 115

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 Spindle Cutting Speed (FPM) x 12

= Speed Dia. of Cut (in inches) x 3.14 (RPM)

*Double if using carbide cutting tool

Example A:

You will finish cut a 1⁄2" diameter piece 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+)

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		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

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 K L M 0 P

Figure 53. Spindle speed levers set for a speed

of 1280 RPM.

-39-