Classification of threshers

Criteria	Type	Description	Advantage	Disadvantage
Feeding type	Hold-on (or head feed)	Only the panicle is fed into the machine	Straw remains intact	Lower throughput Complex machine
Feeding type	Feed-in	The hole crop is fed into the machine	Higher throughput	Clogging with very wet or long straw. Higher power requirement
Crop flow	Axial-flow	Whole crop moves axially around the drum periphery	Low weight Does not need straw separators Good performance with wet crop Can be used for Basmati rice	Higher power requirement
Crop flow	Conventional	Crop flows tangentially through gap between drum and concave	Lower power requirement Concave clearance easy to set	Needs straw walker for separating grains from straw Problems in wet crop Causes high breakage in Basmati rice
Threshing elements	Pegteeth	Rows of peg teeth attached to threshing drum Typical axial flow thresher drum	Grinds up the straw Performs well with wet straw Simple design Cheap
	Rasp bar	Rasp bars attached to threshing drum, usually used in tangential flow threshers	Lower power requirement	Problems with wet straw.
	Wire loop	Typically used in hold-on threshers and head feed combines	Lowest power requirement Thin wire loops comb grain and thresh through impact	Wears quicker

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