I
Operations
.
Mounting a Spindle
Workpiece
Mounting a workpiece on the lathe is
an
extremely important operation.
Improperly mounted
stock
is danger.
ous and
difficult
to
turn.
To
properly
mount a workpiece on the Mark
V,
fol·
low this procedure:
WARNING
• If you're turning glued·up stock,
make sure the glue
joints
are
strong. Glue the
stock
and leave
it
clamped
for
at least
24
hours
prior
to
turning.
• Make sure the workpiece does
not
have
splits,
loose knots, or
other defects.
• Always
cut
stock
that's
more
than 3" square
into
an octagon
using the bandsaw.
NOTE
To
properly
support
a
spindle
c workpiece so that it can
be
dupli·
cated, both the drive center and
the tail stock center must
be
di·
rectly in·line
with
each other. (Re·
fer to your Mark V Owners Manual
to align the lathe centers.)
1.
Find the center
of
the workpiece.
To
mount stock between the lathe
centers,
first
find the center
of
the
stock. With a straightedge, draw two
intersecting diagonal lines corner to
corner on each end
of
the workpiece.
(See Figure
4.)
These two lines inter-
sect at the center
of
the stock.
2.
Seat the lathe centers. Position the
pOints
of
the drive center and cup
center at the center marks on the
workpiece. Then
hit
the centers sharply
with a
plastic
or rawhide mallet.
(See
Figure
5.)
•
To
avoid damaging the live cen·
ter bearing, always use the
cup
center
for
this
procedure. The
hole
left
by the cup center
will
accommodate the live center.
•
To
avoid damaging the centers,
do not
hit
them
with
a metal
hammer. Use a rawhide
or
plas·
tic
mallet.
When properly seated, the drive
center will leave a hole and four slots
where the spurs bit into the wood.
The cup center will leave a hole and a
small circle. (See Figure
6.)
WARNING
When
mounting
stock
between
the centers, the spurs of the drive
center and the cup of the cup cen·
ter
must
penetrate at least
1/16"
into
the stock.
Do
not
use a drive
center, cup center or live center
if
the point is damaged. The
stock
could
be
thrown
from
the
machine.
NOTE
If you're working with hardwood
or
stock
that's
less than 1-1/2" di-
ameter, drill 1/8" diameter holes
1/2" deep
in
both ends
of
the
workpiece, and/or saw diagonal
kerfs 1/8" deep. This will help seat
the lathe centers and keep the
stock
from
splitting
when the cen-
ters are driven into it.
3.
Mount
the
lathe
centers
on
the
Mark
V.
Mount the drive center on
the main spindle and the cup center or
live center in the tailstock.
4.
Set the Mark V
at
the proper speed.
Set the Mark V at the proper speed
and run it briefly.
5.
Mount
the workpiece. Hold the end
of
the
stock
against
the
tailstock
center, then extend the quill and mount
the
other
end on the drive center.
Figure
4.
To
find the center
of
a workpiece,
draw two intersecting diagonal lines corner
to
corner on each end of the workpiece.
Figure 5. With a mallet,
S8i:1t the drive center
in
one end
of
the workpidce and the cup
center in the other.
Figure
6.
When properly seated, the drive
center
will
leave a hole and four
slots
in the wood, as shown on the left; and the
cup center will leave a hole and a circle,
as shown on
the
right. The centers
must
penetrate at least 1/16"
into
the stock.
17
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