Sherline 5000 Mill Assembly Instructions

-38-
diameter of the drill without clearing the chips and adding
coolant. For example:
To drill a 1/8" diameter hole 1" deep: Total Depth
1st Pass: 2 times diameter or 1/4" 1/4"
2nd Pass: 1 times diameter or 1/8" 3/8"
3rd Pass: 1 times diameter or 1/8" 1/2"
Etc.
(You may encounter recommendations exceeding this, but
they are meant for automatic equipment with pressurized
coolant systems.)
It is difficult to maintain tolerances of better than +.003"
–.000" with a drill. If tolerances closer than these are
required, a reamer must be employed. Try to use fractional
size reamers whenever possible rather than decimal sizes,
because the cost difference can amount to 2 or 3 times
higher for decimal sizes. (The length of reamers may
prevent their use for some operations on machines of this
size.)
FIGURE 69—Typical Center Drill
To accurately start holes, center drills must be used. They
have a small tip that accurately starts the hole, and then the
shaft widens with a 60° cutting face to the final diameter.
Care must be taken to employ cutting oil and to clear chips
from the drill frequently. If this is not done, the fragile tip
may load up and twist off, even in soft materials. Center
drills are available in a variety of sizes, but for general work
we recommend size No.1.
SIZE BODY DRILL DRILL LENGTH
DIA. DIA. LENGTH OVERALL
000 1/8" .020" 3/64" 1-1/4"
00 1/8 .025 1/16 1-1/4
0 1/8 .031 1/16 1-1/4
1 3/16 .046 3/64 1-1/4
2 3/16 .078 5/64 1-7/8
3 1/4 .109 7/64 2
FIGURE 70—Table of commonly available center drill
sizes
MILL VISE SET (P/N 3551)
The vise shown here and in use
in Figures 54 and 56 is furnished
with special clamps that allow it
to be clamped in any position on
the mill table. The vise capacity
is 2 inches. It has a movable jaw
that is pulled down while
clamping, eliminating any
chance for the jaw to lift. Perpendicular grooves in the
fixed jaw help secure round stock. It is the most convenient
way to hold small parts for milling. Now available for the
FIGURE 74—Rotary
table
FIGURE 72—Step
block hold-down set
FIGURE 73—Tilting
angle table
mill vise is a rotating base (P/N 3570) that greatly adds to
the versatility of this basic machining accessory.
STEP BLOCK HOLD-DOWN
SET (P/N 3013)
When a part can’t be held in
a mill vise due to its size or
shape, the step block set is the
next most popular way
machinist’s have traditionally
clamped work to the mill
table. Its versatile design
makes setups quick and easy.
The set includes two step
blocks and two step clamps plus an extra unanodized step
block that can be cut and milled to make smaller blocks to
suit your special needs. Also included are six pairs of
threaded studs from 1" to 3.5", T-nuts and special convex
nuts and concave washers that tighen flat on clamps even
if they are slightly tilted.
TILTING ANGLE TABLE
(P/N 3750)
This accessory opens up a great
variety of setup options. The
table can be tilted to any angle
from 0° to 90°. A hole pattern in
the table is designed to easily
mount the mill vise or rotary table
for holding parts. A chuck adapter
is included that allows the 3-jaw
or 4-jaw chuck to be screwed directly to the table as well.
Parts mounted to the table can be machined or drilled at
precise angles without tilting the column or headstock. In
the 90° position, the rotary table is held at the same height
as it would be on the P/N 3701 right angle plate, eliminating
the need for that accessory.
4" ROTARY TABLE (P/N 3700)
The rotary table mounts to the
mill table and provides a rotary
axis for milling. Each increment
on the handwheel represents
1/10° of rotation, so a circle can
be divided into 3600 segments
without interpolation. Seventy-
two handwheel revolutions
rotate the table one time. It can
be used to mill a radius on a part,
cut a circular slot or drill precision circular hole patterns.
Used with the right angle attachment (P/N 3701) and right
angle tailstock (P/N 3702), it can also be used to cut gear
teeth. A rotary table used with a mill allows a machinist to
produce virtually any part he can design. On a Sherline
mill, the only limits are size, not complexity. The compact
size of this high quality rotary table also makes it a good
choice for use on larger machines as well, where its size
would offer an advantage in working with small parts. (See
Figure 51 for a photo of the rotary table in use.)
FIGURE 71—Mill vise