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
G H J | K L | M 0 P |
