Pattern Work

When using a pattern, the rub collar can be posi- tioned 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 or oversize pieces and then shaping the edge in a simple two-step operation. A pattern can be incorporated into a jig by way of adding toggle clamps, hand holds or other safety devices.

You have greater flexibility when choosing the correct diameter rub collar for pattern work than for non-pattern work. If you look at Figure 43, you will notice that the position of the pattern deter- mines the depth of cut. In other words, your pat- tern size is dependent upon the interrelationship of the cutting circle, the desired amount of mate- rial removed, and the rub collar size. Changing one or more of these will change the amount of material removed. Planning ahead, you can most effectively decide which rub collars are best suit- ed for your application.

Pattern	Rub Collar

Figure 43. Rub collar determines depth of cut.

When making a pattern jig here are a few things to consider:

1.Build your jig from a material that will smoothly follow the rub collar or fence.

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2.Make the jig stable, using proven methods and materials, and fasten the hand holds for operator comfort and safety.

3.Secure your workpiece on the three sides that will not be cut with toggle clamps, or fas- ten the workpiece to the jig with wood screws. Ensure that clamps and hidden screws do not come into contact with the cut- ter.

4.Design your jig so that all cutting occurs underneath the workpiece as shown in Figure 44. Notice the operator is not exposed to the cutting edge of the cutter!

5.Always consider the cutting circle and rub collar diameter for the correct cutting depth when designing your pattern.

6.Make sure the workpiece rests flat on the table, not on the fixture.

Workpieces must be solid, stable, and secured to the jig; or kickback may occur, causing personal injury.

Workpiece fits here

Figure 44. Pattern jig for making curved pieces

(guard removed for clarity).

Irregular or freehand shaping takes a high degree of skill and dexterity. The fence assembly is not used during irregular shaping, so rub collars must be used. Also, unless your jig is designed to touch the rub collar before contacting the blade, a starting fixture must be used to begin your cut.

Grizzly G8622 instruction manual Pattern Work