Grizzly MODEL G0765 owner manual Manual Feed, Spindle Speed

Manual Feed

The cutting tool can be manually fed into the workpiece using the carriage, cross slide, and compound rest handwheels shown below.

Carriage

Handwheel

Compound

Rest

Handwheel

Cross Slide

Handwheel

Figure 45. Manual feeding controls.

Carriage Handwheel

Graduated Dial
Increments	0.01" (0.25mm)
One Full Revolution	0.8" (20.3mm)

The carriage handwheel moves the carriage left or right along the bed. Adjust the position of the graduated scale by holding the handwheel with one hand and turning the dial with the other.

Cross Slide Handwheel

Graduated Dial
Increments	0.001" (0.025mm)
One Full Revolution	0.04" (1.02mm)

Use this handwheel to move the tool toward and away from the work. The cross slide handwheel has an indirect-read graduated dial. This means the distance shown on the scale represents the actual distance the tool moves.

Compound Rest Handwheel

Graduated Dial
Increments	0.001" (0.025mm)
One Full Revolution	0.04" (1.02mm)

Use this handwheel to move the cutting tool lin- early along the set angle of the compound rest. Set the compound rest angle by hand-rotating it and securing in place with two cap screws. The compound rest has an indirect-read graduated dial.

Model G0765 (Mfd. Since 12/13)

Spindle Speed

Using the correct spindle speed is important for getting safe and satisfactory results, as well as maximizing 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 lathe controls 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 workpiece, as noted in the formula shown below.

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

*Double if using carbide cutting tool

Figure 46. Spindle speed formula for lathes.

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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