Boring and Milling Table - Home Model Engine Machinist

the top and boring the hole for the sleeve.
If the table is made smaller than this, it can
probably be turned and bored on the faceplate
of the lathe itself, but the larger size
will be more useful.
After the machining had been done, the
holes for clamping work to the table were
drilled as in Fig. 2, and tapped ¼"-20. They
may be laid out to suit individual requirements,
or the table can be left blank and
holes drilled as necessary to suit the job in
hand.
Turning the clamping screw from solid
steel (Fig. 3) was a simple lathe job. The
screw was threaded 5/16"-18, and the hole
for it drilled in the table casting before the
clamping slot was cut with a hack saw.
One half of the hole was tapped to fit, the
other half drilled out to clear the threads.
This completed the work on the table, which
is shown with the clamping screw in place in
Fig. 4.
Cold-rolled steel was turned and bored to
the dimensions shown for the base of the
supporting column (Fig. 5). The bottom
of this piece was made to fit the lathe, so
that it can be clamped to the cross slide in
place of the compound rest. Reversed in the
lathe and supported by the steady rest, as in
Fig. 6, the column was left-hand threaded
for the adjusting screw, a specially ground
cutter bit being used. The keyway was
made with a Woodruff keyway cutter while
the work was held in a milling attachment.
A brass tube of a size to be a nice sliding
fit on the column was squared on both ends
while held in the three-jaw chuck and supported
by the steady rest, then drilled for
screws to hold the key fast. The end cap
was turned from steel to a snap fit in the
sleeve, then reversed in the chuck as in
Fig. 7 for threading the hole for the adjusting-screw
guide. Drilling and tapping the
holes for the two retaining screws, which
was done with the end cap snapped into
place in the sleeve, completed the supporting
column.
The adjusting screw was made from ½"
steel rod, centerdrilled at each end and
turned between centers (Fig. 8). The lefthand
Acme threads, 10 to the inch, were cut
to fit those in the steel column. The work
NOVEMBER, 189