Grizzly G0755 owner manual Removing Tool Holder, Determining Spindle Speed, Tools Needed Qty

Removing Tool Holder
Tools Needed	Qty
Wrench 19mm	1
Brass or Dead Blow Hammer	1
To remove tool holder:

1.disCONNECT MACHINE FROM POWER!

2.remove drawbar cap, and only unthread drawbar from tool holder one full rotation.

Note: Do not fully unthread tool holder from drawbar, or drawbar and tool holder threads could be damaged during the next step.

3.tap top of drawbar with hammer to unseat taper.

4.hold onto tool holder with one hand and fully unthread drawbar with the other hand.

Model G0755 (Mfg. Since 1/13)

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 your operation, you will need to: 1) Determine the best spindle speed for the cutting task, and 2) configure the spindle speed levers to produce the required spindle 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 26.

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

*Double if using carbide cutting tool

Figure 26. Spindle speed formula for mill/drills.

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.

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