Robotic lawn mower cutting disc

This is a robotic lawn mower cutting disc designed for the Liam6 robotic lawn mower, but could be used for any mower with an M8 bolt for the axis.

The ideas behind the design are to:

1. distribute forces a bit to allow for printing with a lower strength material, like PLA,
2. allow for the knives (standard robotic lawn mower knives with their M4 screws) to freely rotate around their screws, thereby reducing damage due to mechanical chock,
3. lower the cutting disc to a level corresponding to a max grass height of approximately 4 cm for the Liam6 design, and,
4. protect the spinning knives with a cover as in some commercial mowers.

FreeCAD files are included.

Knives, with their screws for free rotation, can, e.g., be found on ebay.

Print Settings

Printer Brand:

Prusa

Printer:

i3 MK2S

Rafts:

Doesn't Matter

Supports:

Yes

Resolution:

0.2mm

Infill:

20%

Notes:

I have used standard PLA. It has held together so far. :)

Post-Printing

Cutting disc inside Liam6 cage - side view.

Cover disc inside Liam6 cage - bottom view. Notice freely moving knife blades.