From DIYinfo.org
[edit] Introduction
The jigsaw is used for joinery work, kitchen cupboards, cutting curves and odd shapes. Due to its limited power and depth of cut, it is best suited to solid timber up to 32-38mm (1 ¼ ” – 1 ½ ”) maximum thickness, any type of pressed board up to the same thickness, (i.e. ply, masonite, chipboard etc.). A good rule to apply is that the cut depth should not exceed ¾ of the length of the blade you are using.
In a complete workshop, you will need both a jigsaw and a Circular Saws because they are generally not interchangeable in operation and tasks they perform. The correct way to use a jigsaw or any saw is to let the saw do the work, that is do not try to force the cut, but to keep up an even pressure allowing the saw to cut at it’s own pace through the material. Always keep the jigsaws footplate flat on the surface; these two simple points will lengthen the life of your blades. (i.e. sharpness and breakage.)
Jigsaws cut on the upward stroke. Wear safety goggles when using this machine because the chips are thrown upwards.
When cutting material which has a good face, turn that face downwards so that any chipped edges will be on the back of the board. If this is not possible, apply masking tape on the cut line making sure the tape is stuck down well, and then as you cut through the middle of the tape the chipping effect should be greatly diminished. To stop scratches forming on the surface from the jigsaw, apply a smooth plastic style duct tape to the base of the jigsaws footplate.
Blades are available in various pitches and sets. It is possible to cut aluminium, plastic, ceramic tiles and glass fibre as well as timber. Different brands take different types of blades so when purchasing blades make sure they are the correct blade not only for the material you are about to cut but also your brand of jigsaw (blades are generally not interchangeable between brands).
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