Grizzly G9249 owner manual Gap Removal, Spindle Bearing Preload

Gap Removal

The Model G9249 comes equipped with a gap section below the spindle that can be removed for turning large diameter parts or when using a large diameter faceplate.

The gap is installed, then ground, at the factory during lathe assembly for precise fit and align- ment. Factors during the remaining assembly apply additional forces to the gap making the replacement of the gap to the original position very difficult. If you choose to remove the gap, we do not recommend attempting to replace it.

Tools Needed	Qty
Hex Wrench 8mm	1
Wrench 12mm	1
Dead Blow Hammer	1
To remove the gap:

1.DISCONNECT LATHE FROM POWER!

2.To release the taper pins from the gap, slowly tighten the taper pin hex nuts (see Figure 100), then remove the pins.

Taper Pins &

Hex Nuts

Cap

Screws

Figure 100. Gap taper pins and cap screws.

3.Remove the four cap screws.

4.Tap the outside of the gap with a dead blow hammer to loosen it, then remove the gap from the lathe.

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Spindle Bearing

Preload

The Model G9249 is shipped from the factory with the spindle bearing preload properly adjusted. However, if the spindle ever develops enough end-play that the workpiece finish suffers, you can adjust the bearing preload to remove the end-play.

Adjusting the spindle bearing preload requires using a spanner wrench or a punch and hammer. You can either purchase the spanner wrench at a tool store or fabricate one using the diagram shown in Figure 101.

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Figure 101. Spanner wrench dimensions.

NOTICE

To fully understand the process of preload- ing the spindle bearings, read this entire subsection before performing any of the steps.

Tools Needed	Qty
Hex Wrench 5mm	1
Hex Wrench 8mm	1
Spanner Wrench, or Hammer and Punch	1
Test Indicator	1
Small Sledge or Heavy Dead Blow Hammer	1
Wooden Block	1

To adjust the spindle bearing preload:

1.Run the lathe for 20 minutes on a high speed to bring the lathe to a normal operating tem- perature.

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