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 12" 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.

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Image 41
Grizzly G0554Z owner manual Example a, Step, Result, Example B, 1800, 1280, 910, 650, 460, 325, 230, 160, 115