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To keep the cut square, use a sharp blade and avoid forcing the saw through the cut. To “plunge cut,” that is, make an entry saw cut into the middle of your wood, tip the jigsaw so that the blade is parallel to the workpiece and the saw's weight rests on the front lip of the shoe.
Similarly, it is asked, can you cut 2x4 with a jigsaw?
To cut 2x4 consistently with a jigsaw, you have to keep drift and flexing to a minimum. All too often, an inexperienced jigsaw user will make a cut that's dead on straight on top, but beveled out and off the cutting line at the bottom.
Thereof, why does my jigsaw not cut straight?
To Cut Straight your Jigsaw Needs a Guide Bearing The guide bearing adds a second support point on the blade. This almost completely eliminates and side to side movement of the blade (it can still happen if you turn too sharp, or the blade gets stuck in warped or poorly supported material).
Instead, select a 10- to 12-tpi blade for larger, gradual curves, or a 20-tpi blade for tight curves (1" radius or less) in solid wood and all cuts in plywood or melamine-coated particleboard. Finally, remember that jigsaw blades cost a fraction of the material you're cutting.