CARRIAGE STOP
You can attach the carriage stop to the bed at any
point where you want to stop the carriage. The
carriage stop is used principally in turning, facing, or
boring duplicate parts; it eliminates the need for
repeated measurements of the same dimension. To
operate the carriage stop, set the stop at the point
where you want to stop the feed. Just before the
carriage reaches this point, shut off the automatic feed
and carefully run the carriage up against the stop.
Carriage stops are provided with or without
micrometer carriage stop. Clamp it on the ways in the
approximate position required and then adjust it to the
(NOTE: Do not confuse this stop with the automatic
Figure 6-32.--Thread dial indicator.
carriage stop that automatically stops the carriage by
disengaging the feed or stopping the lathe.)
The angle of the desired taper is set on the guide
bar of the attachment, and the guide bar support is
GRINDING ATTACHMENT
clamped to the lathe bed.
The grinding attachment, illustrated in figure
Since the cross-slide is connected to a shoe that
6-34, is a portable grinder with a base that fits on the
slides on the guide bar, the tool follows along a line
compound rest in the same manner as the toolpost.
that is parallel to the guide bar and hence at an angle
Like the cutting tool, the grinding attachment can be
to the work axis corresponding to the desired taper.
fed to the work at any angle. It is used for grinding
hard-faced valve disks and seats, for grinding lathe
The operation and application of the taper
centers, and for all kinds of cylindrical grinding. For
attachment will be explained further later in this
internal grinding, small wheels are used on special
chapter.
quills (extensions) screwed onto the grinder shaft.
THREAD DIAL INDICATOR
lets you quickly return the carriage to the beginning of
the thread to set up successive cuts. This eliminates
the necessity of reversing the lathe and waiting for the
carriage to follow the thread back to its beginning.
The dial, which is geared to the lead screw, indicates
when to clamp the half-nuts on the lead screw for the
next cut.
The threading dial consists of a worm wheel that
is attached to the lower end of a shaft and meshed
with the lead screw. The dial is located on the upper
end of the shaft. As the lead screw revolves, the dial
turns. The graduations on the dial indicate points at
which the half-nuts may be engaged. When the
threading dial is not being used, it should be
disengaged from the lead screw to prevent
Figure 6-33.--Micrometer carriage stop.
unnecessary wear to the worm wheel.
6-18
