Typically you completely, positively have to know the angle of the leading edge on a knife. While you do, the perfect software for the job is a laser goniometer, and [Felix Immler] exhibits us three alternative ways to construct one. (YouTube)

The underlying precept of all three of those builds is to venture mirrored laser mild off a knife blade onto a scale going from 0-45˚. [Immler] exhibits a primary demonstration of this idea with a hinge towards the start of the video (after the break). Blades with a number of bevels will mirror mild to every of the suitable factors on the dimensions.

The best model of the software is a printed PDF scale hooked up to a picket field with a gap for the blade to go via. The subsequent makes use of a big pipe finish cap and a drilled-out piece of wooden to create a extra manageable measuring software. Lastly, [Immler] labored with a buddy to design a 3D printed goniometer with differently-sized adapters to suit quite a lot of laser pointers.

Now that you simply’re prepared to exactly sharpen your blades, why not sharpen this guacamole bot or strive making your personal knife from uncooked ore?