Symptoms
- Cut veers off the intended line over distance
- Line looks fine at the start but drifts later
- Cutting freehand feels hard to control
- Cut edge is angled rather than vertical
Likely causes
- CommonNo straightedge guide used for a long cutFreehand jigsaw work drifts easily without a physical guide.
- CommonBlade deflecting sideways from a dull edge or fast feedA struggling blade bends away from the line under pressure.
- PossibleBase plate not held flat against the materialTilting the saw changes the cut angle as you go.
- PossibleWrong blade width or type for the cutNarrow blades are better for curves but wander more on long straight runs.
What to do
- Clamp a straightedge guide to the workpiece and run the jigsaw's base plate against it for long straight cuts.
- Use a sharp, appropriately sized blade for the material and cut length.
- Keep the base plate flat against the material throughout the cut rather than tilting it.
- Slow your feed rate to let the blade track the line instead of forcing it.
- Reduce the orbital action setting if the saw has one, since aggressive orbital motion can pull the blade off line.
- Test on scrap with the guide in place before cutting your actual workpiece.
Tools and parts
- Jigsaw
- Straightedge guide
- Clamps
- Sharp blade
When to call a pro
If cuts still wander with a guide and sharp blade, a tool repair shop can check the base plate and blade guide for wear.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.