Figure 9-8.–A. Four-Jaw chuck. B. Three-Jaw chuck.
Round-Nosed Turning Tool.–This tool is for
general-purpose machine work and is used for taking
light roughing cuts and finishing cuts. Usually, the top
of the cutter bit is ground with side rake so the tool may
be fed from right to left. Sometimes this cutter bit is
ground flat on top so the tool may be fed in either
direction (fig. 9-7, view B).
Right-Hand Turning Tool.–This is just the
opposite of the left-hand turning tool and is designed to
cut when it is fed from right to left (fig. 9-7, view C).
The cutting edge is on the left side. This is an ideal tool
for taking roughing cuts and for all-around machine
work.
Left-Hand Facing Tool.–This tool is intended for
facing on the left-hand side of the work (fig. 9-7, view
D). The direction of feed is away from the lathe center.
The cutting edge is on the right-hand side of the tool,
and the point of the tool is sharp to permit machining a
square corner.
Threading Tool.–The point of the threading tool is
ground to a 60-degree included angle for machining
V-form screw threads (fig. 9-7, view E). Usually, the top
of the tool is ground flat, and there is clearance on both
sides of the tool so it will cut on both sides.
Right-Hand Facing Tool.–This tool is just the
opposite of the left-hand facing tool and is intended for
facing the right end of the work and for machining the
right side of a shoulder (fig. 9-7, view F).
Square-Nosed Parting (Cutoff) Tool.–The
principal cutting edge of this tool is on the front (fig. 9-7,
view G). Both sides of the tool must have sufficient
clearance to prevent binding and should be ground
slightly narrower at the back than at the cutting edge.
This tool is convenient for machining necks and grooves
and for squaring comers and cutting off.
Boring Tool.–The boring tool (fig. 9-7, view H) is
usually ground the same shape as the left-hand turning
Figure 9-9.–Draw-in collet chuck.
9-6
