Grizzly G4003G owner manual Half-Nut Lever, Inch Threading

Longitudinal and cross slide powered motions are controlled by the carriage/cross feed lever. The lever pivots through two stops that require moving the lever left and right as well as up and down. Moving this lever upward activates the automatic longitudinal feed. Moving the lever down activates the cross slide (Figure 29).

Figure 29. Carriage/cross feed lever in neutral

position.

The half-nut lever clamps and releases the half- nut, which clamps around the leadscrew (Figure 30). The lever is only engaged while cutting threads.

Note: If the apron feed lever is engaged, the half- nut lever is blocked from use; and when the half- nut lever is engaged the apron lever is blocked from use. If both levers were engaged at the same time apron damage would occur.

After the carriage has been returned, the thread dial tells you when to re-engage the half-nut and resume threading (Figure 30).

Half-Nut

Lever

Figure 30. Threading dial and half-nut lever.

When the cap screw is loosened, the thread dial housing pivots so its gear can be engaged or disengaged from the lead screw. When engaged, the dial will turn when the lead screw and spindle are turning.