(6)Apron.

dovetail and the matching dovetail of the crossfeed slide. The gib permits

small adjustments to remove any looseness between the two parts. The slide

is securely bolted to the crossfeed nut which moves back and forth when the

crossfeed screw is turned by the handle.

The micrometer dial on the

crossfeed handle is graduated to permit accurate feed.

Depending on the

manufacturer of the lathe, the dial may be graduated so that each division

represents a 1 to 1 ratio.

The compound rest is mounted on top of the

crossfeed slide.

(c) The carriage has T-slots or tapped holes for clamping work for

boring or milling operations. When the lathe is used in this manner, the

carriage movement feeds the work to the cutting tool which is revolved by

the headstock spindle.

(d) The carriage can be locked in any position on the bed by tightening

the carriage clamp screw.

The clamp screw is to be used only when doing

work for which longitudinal feed is not required, such as facing or cutting-

off stock. Normally, the carriage clamp is kept in the released position.

The carriage is always moved by hand to make sure that it is free before the

automatic feed is applied.

(6) Apron. The apron (figure 2 on page 5) is attached to the front of the

carriage.

It contains the mechanism that controls the movement of the

carriage for longitudinal feed and thread cutting. It controls the lateral

movement of the cross-slide.

One should thoroughly understand the

construction and operation of the apron before attempting to operate the

lathe. In general, a lathe apron contains the following mechanical parts:

(a) A longitudinal feed handwheel for moving the carriage by hand along

the bed. This handwheel turns a pinion that meshes with a rack gear that is

secured to the lathe bed.

(b) Gear trains driven by the feed rod.

These gear trains transmit

power from the feed rod to move the carriage along the ways and to move the

cross-slide across the ways, thus providing powered longitudinal feed and

crossfeed.

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