
-38-
For Machines Mfd. Since 3/21
South Bend Tools
Model SB1119/SB1120
O P E R A T I O N
Pattern Work
When using a pattern, a rub collar or ball
bearing can be positioned either above, below, or
between cutters.
The pattern is usually used when the entire edge
is to be shaped or when many duplicate pieces
are needed. Pattern work is particularly useful
when rough cutting irregular shapes oversize
and then shaping the edge in a simple two-
step operation. A pattern, when attached to a
workpiece by adding toggle clamps, hand-holds,
or other safety devices, make a fixture. Figure
59 shows the proper setup of a pattern and
bearing rub collar.
You have greater flexibility when choosing the
correct diameter rub collar for pattern work than
for non-pattern work. If you look at Figure 59,
you will notice that the position of the pattern
determines the depth of cut. In other words,
your pattern size is dependent upon the inter-
relationship of the rub collar cutting diameter
and the desired amount of material removed.
Changing either the cutter or the rub collar
will change the amount of material removed.
Planning ahead, you can best decide which rub
collars are best suited for your application.
Always perform test cuts on scrap stock to ensure
the pattern works as required.
Rub
Collar
Workpiece
Template
Figure
Figure 59. Position of pattern on workpiece and
. Position of pattern on workpiece and
bearing size determine depth of cut.
bearing size determine depth of cut.
Things to consider when making a pattern
or fixture:
• Use a material that will smoothly follow rub
collar, ball bearing, or fence.
• Secure workpiece to a pattern (on sides that
will not be cut) with toggle clamps, or fasten
with wood screws.
• Make your fixture stable! Use proven
methods and materials, and attach hand-
holds for operator comfort and safety.
• Ensure clamps and hidden screws do not
come into contact with cutter.
• Design your fixture so that all cutting occurs
beneath workpiece.
• Always consider rub collar diameter for
correct depth-of-cut when designing your
pattern.
• Make sure your workpiece rests flat on work
table, not on work fixture.
• Remember, there are tremendous cutting
forces involved. Fixtures must be solid and
stable, and any workpiece must be firmly
secured.
Use care in designing and making fixtures.
Clamps and screws cannot touch cutter, and
fixtures must be stable in use, with workpiece
resting on shaper table, not on fixture.
Workpiece must be fixed securely to the jig.
Содержание SB1119
Страница 76: ...southbendtools com Printed In Taiwan CS21788...