Grizzly G0758 owner manual Removing Tooling, Determining Spindle Speed, To remove tooling

Removing Tooling
Tools Needed	Qty
Spindle Pin	1
Wrench 8mm	1
Brass Hammer	1
To remove tooling:

1.DISCONNECT MACHINE FROM POWER!

2.Remove drawbar cap and secure spindle with spindle pin. Unthread drawbar from tool- ing one full rotation.

Note: Do not fully unthread tooling from drawbar or the drawbar and tool threads could be damaged in the next step.

3.Tap top of drawbar with brass hammer to unseat taper.

4.Hold onto tooling with one hand and fully unthread drawbar.

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Spindle Speed

Using the correct spindle speed is important for safe and satisfactory results, as well as maximiz- ing tool life.

To set the spindle speed for operation, you will need to: 1) Determine the best spindle speed for the cutting/drilling task, and 2) adjust the gear box knob and variable-speed knob to produce deter- mined speed.

Determining Spindle Speed

Many variables affect the optimum spindle speed to use for any given operation, but the two most important are the recommended cutting speed for the workpiece material and the diameter of the cutting tool, as noted in the formula shown in Figure 29.

*Recommended		Spindle
Cutting Speed (FPM) x 12	=
		Speed
Tool Dia. (in inches) x 3.14
		(RPM)

*Double if using carbide cutting tool

Figure 29. Formula for determining best spindle

speed.

Cutting speed, typically defined in feet per minute (FPM), is the speed at which the edge of a tool moves across the material surface.

A recommended cutting speed is an ideal speed for cutting a type of material in order to produce the desired finish and optimize tool life.

The books Machinery’s Handbook or Machine Shop Practice, and some internet sites, pro- vide excellent recommendations for which cutting speeds to use when calculating the spindle speed. These sources also provide a wealth of additional information about the variables that affect cutting speed and they are a good educational resource.

Also, there are a large number of easy-to-use spindle speed calculators that can be found on the internet. These sources will help you take into account the applicable variables in order to deter- mine the best spindle speed for the operation.

Model G0758 (Mfd. Since 2/14)