Why curves are a jigsaw job
A jigsaw cuts with a short, thin blade that moves up and down, held at one end. Because the blade is narrow, it can turn where a circular saw or miter saw cannot, which makes it the usual tool for sink cutouts, scrollwork, rounded corners and template shapes. The trade-off is that the same narrow blade flexes, so it can drift off square or wander if you push it.
This article is about steering through curves and setting angles. General habits such as orbital action and clamping are covered separately, so only the points that matter for curves appear here.
Start with a plan for the line
Draw the curve clearly. For repeated shapes or smooth arcs, trace around a template, a can, a compass line or a flexible strip held in place with weights. A pencil line that is easy to see saves you from correcting mid-cut.
Think about where the cut will start. A tight curve is easier if you begin on a straighter portion so you establish the rhythm before turning. If the shape is an interior cutout, drill a starter hole slightly larger than the blade in the waste area, so you can drop the blade in without a plunge cut.
Blade choice for tight radii
Blade width is the main factor for curve work:
- Narrow blades turn tighter radii because there is less blade body to rub against the sides of the kerf. They also bend more, so they may leave an angled cut face in thick stock.
- Wider blades hold a straighter line and suit gentle curves and thicker material.
- Tooth count affects finish and speed: finer teeth leave a smoother edge but cut slowly, and coarser teeth cut quickly with more roughness.
Scroll-style or narrow-profile blades are often chosen for the tightest turns, while general wood blades cover broad arcs. The blade also has to match the material, so a blade for wood is not the right one for metal or laminate. Confirm that the blade shank fits the saw, since clamp styles vary. Check the packaging against what you plan to cut, since the right jigsaw blades depend on both tooth shape and material.
As a rule of thumb, the tighter the curve, the narrower the blade you should pick, and the thinner the stock should be. Very thick material on a tight radius strains a narrow blade and can snap it, so a different tool or a series of relief cuts is often smarter.
Steering through the curve
Set the saw’s base plate flat on the work and let the blade reach full speed before it touches the wood. Move the saw forward at a pace that lets the teeth cut rather than grind. Do not twist the saw body sideways to force a turn. Instead, guide it gradually, turning the whole saw in a smooth arc. If the blade is deflecting, it will slow and you will feel it; back off and let it catch up.
Relief cuts help with tight curves. Make several short straight cuts through the waste toward the line before you cut the curve itself. Those pieces fall away as you progress, so the blade is no longer trapped in a narrow, curved kerf. On a convex shape, relief cuts are very effective.
For a clean interior corner, cut to the corner, back out slightly, and then cut the next side, instead of trying to pivot on the spot. For sharp inside corners, it is often cleaner to drill a hole at each corner first and cut between them.
Keep your hands clear of the blade path and the underside of the workpiece, and keep the cord out of the cut. Wear eye protection and consider hearing and dust protection if you are cutting many pieces.
Setting up bevel cuts
Most jigsaws have a base plate that tilts, commonly in both directions with detents at typical angles. To set a bevel:
- Unplug the saw or remove the battery.
- Loosen the base plate lock as described in your manual.
- Tilt it to the angle you want.
- Retighten and check the angle against a bevel gauge or a speed square, with the blade installed.
- Test on scrap.
Scale markings on the saw are often approximate, so verification matters. Cuts at a steep angle effectively lengthen the path of the blade through the wood, so a gentle feed helps. If the blade bends, the bevel will not be uniform from top to bottom.
For curved bevels, such as the edge of a rounded tabletop, practice the same steering technique, but move slowly because the base plate can tip on a curve if it is unsupported. Keep the plate fully in contact with the surface at all times.
Tips for cleaner edges on curves
- Cut slightly outside the line and sand or plane back to the pencil mark.
- Place masking tape along the cutline to reduce surface splintering on some materials.
- Support the waste piece so it does not drop and pinch the blade near the end of the cut.
- Cutting plywood can chip on the top face, so check which side your blade cuts cleanly, and put the good face down or up accordingly.
- Replace dull blades. A dull blade overheats, wanders and burns the edge.
When to use a different tool
A jigsaw is good for rough and moderately accurate shapes. For perfectly repeatable curves, a template and a router or a bandsaw is often a better fit. For thick stock or long, flowing curves, a bandsaw tends to track more accurately because its blade is supported on both ends.