Southbend SB1041, SB1040 owner manual Circle Cutting Jig, To use the circle cutting jig

Model SB1040/SB1041 O P E R A T I O N For Machines Mfg. Since 8/09

Circle Cutting Jig

The Model SB1040/SB1041 includes a jig that attaches to the guide post to provide an easy and accurate method for cutting circular shapes.

The jig is capable of adjusting to fit a variety of workpiece dimensions and radii. The instructions on this page describe the general use of the jig so your particular setup may vary. Adjustments are made by loosening the cap screws or set screws that secure that hold the components in place. Always make sure all screws are fully tightened before beginning an operation.

If the curve you plan to cut does not touch an exposed edge of the workpiece, you will need to prepare the workpiece beforehand by making a cut up to the radius line or drilling a hole next to the radius line.

To use the circle cutting jig:

1.DISCONNECT BANDSAW FROM POWER!

2.Use the included M8-1.25 x 25 cap screws and lock washers to mount the circle cutting jig to the guide post, as shown in Figure 36.

Guide Post

Cap Screws &

Lock Washers

Jig

Jig Center

Point

Figure 36. Circle cutting jig installed (some

components removed for clarity).

3.Drill a small hole at the radius center point on your workpiece. The hole should be large enough that the jig center point can fit into it and provide a stable pivot point.

4.Install a blade with the proper width for radius of the circle you want to cut, using Figure 14 on Page 24 as a guide.

5.Adjust the jig as needed to position the center point away from the blade a distance equal to the radius of the arc you want to cut, and aligned with the blade, as shown in

Figure 37

	Prepared
	Edge	Curve
		Radius
Proper		Workpiece
Alignment
Curve
Radius

Figure 37. Adjusting curve radius

(some components removed for clarity).

6.Place the workpiece on the table with the prepared edge next to, but not touching the blade, then lower the blade guides to within 1⁄4" of the workpiece (if possible), adjusting the jig centerpoint vertically as needed to provide clearance.

7.Lock the guide post, then lower the jig centerpoint into the centerpoint you drilled into the workpiece in Step 3. Tighten all of the fasteners on the jig to make sure it doesn't move during operation.

8.Turn the bandsaw ON, then feed the workpiece into the blade, rotating it around the centerpoint

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