How to use variable speed on a jigsaw
A speed dial wheel – if your jigsaw has one – lets you adjust the sawing speed for different materials. Generally, a slower speed is recommended for harder materials such as hard wood, fiberglass, aluminium and steel. A higher sawing speed can be used with softer materials such as pine, composites, plywood and fiberboard. Variable speed also lets you start cutting slowly and precisely at first, before moving up to full speed when the saw is on the right track.