Find out how to make and use a easy shop-made jig on your band noticed that may have you ever reducing excellent circles very quickly.
With its slim blade, the band noticed excels at reducing easy curves. For nonsymmetrical shapes and workpieces made up of a number of curves, reducing freehand normally does the trick. So long as you retain it gradual and regular you’ll be able to comply with your cutline fairly intently, after which clear up the outcomes later with sanding. However even with probably the most cautious sawing, following the cutline for an ideal circle, probably the most primary of symmetrical shapes, might be daunting — the outcomes are seldom excellent. Nonetheless, with a easy jig that you may make shortly and simply, you’ll be capable of reduce a precise circle each time on the band noticed with out the necessity to comply with a cutline. The truth is, you received’t even want to attract the circle in your workpiece, so you’ll be able to go away your compass in a drawer.
STEP 1: To create the jig, reduce a chunk of sheet inventory to the width of your band noticed’s desk. For circles as much as 16″ in diameter, a jig 10″ to 12″ lengthy is okay. I want laminated materials comparable to melamine, because it permits your workpiece to slip simply whereas reducing, however common plywood or different sheet inventory with a easy floor will work superb. Middle the jig in your band noticed’s desk — the sides of the jig ought to be flush with the sides of the desk — and slide it until it simply touches the blade. Make a mark on the entrance fringe of the jig even with the ideas of the blade tooth, as in Photograph 1.
STEP 2: Beginning at your mark, use a dependable sq. to proceed the road throughout the floor of the jig as in Photograph 2. You possibly can see right here that I’ve drilled holes into the jig’s facet edges that may accommodate a pair of fence clamps to safe the jig to the band noticed’s desk. Now, measuring from the entrance edge, make a collection of marks 1″ aside alongside this line.
Step 3: With a 1/4″ or 3/8″ bit in your drill press, bore holes precisely on every of your marks (see Photograph 3). Drill simply wanting going throughout the jig. When reducing the circle, the workpiece will pivot on a brief size of dowel inserted into certainly one of these holes. As a result of the workpiece rotates at these holes, every marks the precise heart of the circle, with the gap from the entrance fringe of the jig figuring out the circle’s radius. Thus, the primary gap drilled at 1″ would be the pivot for a 2″ circle; the opening drilled at 2″ provides a 4″ circle, and so forth. You would possibly discover it useful to mark your jig with a everlasting marker as I’ve finished right here.
STEP 4: Place the jig in your band noticed’s desk so your line of holes is perpendicular to the blade and even with the ideas of the blade’s tooth. A bit of paper held behind the blade, as I’m doing in Photograph 4, makes it simpler to see the tooth. With the jig appropriately positioned, clamp it securely to the noticed’s desk.
STEP 5: Minimize a brief size of 1/4″ or 3/8″ hardwood dowel on your pivot. This dowel ought to be quick sufficient that it’s going to match right into a gap drilled on the underside of your workpiece however nonetheless enable the workpiece to relaxation flat on the desk. For this instance, I’ve determined to chop an 8″ circle, so in Photograph 5 I’m slipping the dowel into the opening that’s 4″ from the entrance fringe of the jig. (Keep in mind, the gap from the blade is the circle radius.)
STEP 6: Minimize a workpiece barely bigger than the specified circle; for our 8″ circle right here I’ve reduce a workpiece measuring 8-1/2″ x 8-1/2″. Now, measure precisely 4″ from the middle of the entrance fringe of the workpiece and drill a gap sized to just accept the pivot dowel (see Photograph 6). The aim you take into account on your circle will decide how deeply to drill this gap: For an unblemished high floor, don’t drill throughout. If the highest floor isn’t crucial — should you’re reducing wheels, for instance, that require an axle going throughout the circle — it’s OK to drill throughout the workpiece. Observe right here that I’ve marked an arrow pointing to the entrance edge to maintain issues straight.
STEP 7: Drop the workpiece onto the dowel as in Photograph 7, ensuring to maintain the entrance edge oriented towards the blade. In the event you’ve finished every little thing appropriately, the workpiece will fall into place with the entrance edge simply kissing the blade.
STEP 8: Activate the noticed, and rotate your workpiece easily on its pivot as in Photograph 8 to chop an ideal 8″ circle. When the circle is full, energy down the noticed and let the blade come to a full cease earlier than eradicating the workpiece and waste.
For the jig on this instance I’ve drilled the pivot holes at 1″ intervals, however be happy to set your jig as much as create circles of any desired dimension. Simply keep in mind that the pivot holes ought to at all times replicate the radius of your required circle. Additionally, should you assume you could use your circle-cutting jig ceaselessly, take into account attaching a cleat to the underside that may match the miter slot in your band noticed’s desk to make setup sooner and simpler.