Plunge cut to your hearts content.

The mechanism is like the Dualsaw. Two blades running next to each other, taking turns to make an oscillating cut. This means the virtual tip length will always be constant and therefore no blade bending bounce.

Of course a more complex gear box would be needed and blades would have to be stronger and thinner.

This would be great in a demolition reciprocating saw as well.
-- wjt, Dec 18 2012

random, halfbakery