The ROBOScythe almost ready for use. 

The new design based on VSLOT 20x20 extruded aluminium

The drive system based on two MG996 servos and GT2 pulleys. Side effect: I created a GT2 Pulley pack on Thingiverse.

The cutting equipment based on a BLDC motor. ( +ESC ) 

The blade has three wings with Robotic lawnmower razors (from OBI). You can use damilhead optionally

The ROBOScythe blade has a shield. And this shield built it with two pressure sensors.

The third "gear" is a tail and stabilizes the device.

And that's all together.