Electric Chaff Cutter

A chaff cutter is a livestock-fodder processing machine that chops dry and green forage (sorghum stover, Napier grass, maize stalks, paddy straw, lucerne) into one to three centimetre pieces for ruminant feeding. Cut chaff is more palatable, reduces selective feeding losses and is easier to mix with concentrate.

Function

Two feed rollers compress the fodder and meter it forward against a rotating flywheel that carries four to five blades. The blades shear the fodder against a stationary counter-cutter at the discharge throat; the chopped material is ejected through a chute into a feed trough or sack.

Design and specifications

Single-phase 2-3 HP and three-phase 5 HP electric motors are standard for dairy and small-ruminant herds. Larger trolley-mounted units use diesel engines or 10 HP three-phase motors. Safety requirements for hand-operated units are codified in BIS IS 7898 (revised 2001) under section FAD 20 (Agriculture and Food Processing Equipments), which mandates a flywheel-locking device, a front-blade safety guard, length variation under 5%, and vernacular cautionary labels covering loose-clothing, smoking and hand-feeding hazards.

Operation

Fodder is fed in steady bundles aligned with the rollers; never by hand close to the feed throat. The flywheel must be locked before any maintenance, and lubrication of bearings is required at the intervals indicated by the manufacturer. Cutting length is adjusted by changing the gear ratio between rollers and flywheel.

Subsidy and adoption

Chaff cutters are widely subsidised under state animal-husbandry departments and the National Programme for Dairy Development. Adoption is essentially universal in commercial dairies and rapidly rising among smallholder mixed farms.

References

IS 7898 Manually-Operated Chaff Cutter. Bureau of Indian Standards.
NCC-03 Chaff Cutter with Motor. Neptune Farming.