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A hay cutter is a device that cuts grass, hay, straw, or other light biomass. It is part of haying equipment, haybines, silage equipment, mowers, and agricultural combines.
This should really be called a mower. More specifically, a reciprocating mower, sickle mower, or finger-bar mower. A "hay cutter" can be mistaken for something more like a wood chipper that chews up biomass and spits it out a chute.
A cutter has a number of moving parts and is subject to failure. Open source, modular hay cutters solve the need for easy self-maintenance and adaptation to many devices, from combines to balers, reducing infrastructure costs. The goal is a machine that fully meets OSE Spec
 Product Ecology
- QA Plate
- Mounting Frame
 Study of Industry Standards
OSE hay cutter is studying the industry standards with this hydraulic-retrofit of a hay cutter:
 See Also