Change Gears

Change gears are configured to provide a wider range of feed rates and inch/metric threading.

Use Figure 55 and the descriptions below to become familiar with the components of the change gear system.

A

B

C

F

D

E

G

Figure 55. Change gear system.

A.Spindle Gear: Transfers power from the spindle to the change gear system.

B.Forward/Reverse Drive Gears: Selects clockwise or counterclockwise rotation of the feed rod or leadscrew.

C.Top Change Gear: Transfers power from the drive gears to the middle change gear.

D.Middle Change Gears: Transfers power from the top change gear to the bottom change gear. This is a 120T/127T combina- tion gear.

E.Bottom Change Gear: Transfers power from the middle change gears to the feed rate gearbox.

F.Feed Direction Lever: Selects which for- ward/reverse drive gear will transfer power from the spindle gear to the change gears.

G.Pivot Bracket: Provides positioning of the middle change gear so that it correctly mesh- es with the top and bottom change gears.

Tools Needed

Qty

Hex Wrench 5mm

1

Wrench 16mm

1

Wrench 18mm

1

To re-configure the change gears:

 

1.DISCONNECT LATHE FROM POWER!

2.Open the change gear door.

3.Use the feed direction lever to engage one of the drive gears with the spindle gear to keep the change gears from rotating during the next step.

4.Loosen the hex nut on the top change gear, the hex nut on the middle change gears, and the cap screw on the bottom change gear.

5.Support the middle change gears, loosen the hex nut securing the pivot bracket, then allow the middle change gears and bracket to swing down.

6.Remove the retaining fasteners of the top and bottom change gears, then remove these gears.

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G9249  12" x 37" Belt Drive Gap Bed Lathe

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Grizzly G9249 owner manual Change Gears, To re-configure the change gears