Cold Saw/V1 Design Rationale/Blade Rotation System
A Drive system rotates the blade.
http://opensourceecology.org/wiki/Cold_Saw/V1_Design_Rationale/Blade_Rotation_System/Drive
A Guard system protects the operator and nearby entities from blade contact.
http://opensourceecology.org/wiki/Cold_Saw/V1_Design_Rationale/Blade_Rotation_System/Guard