As the Disgustoids empire grew, Minkles was tasked to build the Cartel an army using whatever means necessary. Using his mechanical expertise, Minkles was able to build these machines by scavenging the endless piles of junk in the Carnival Junkyard to create these Frankenstein-carnival-war-machines of death.
Like their Disgustoid masters, the Grinders require BONK to operate which provides the fuel to drive the machine parts.
Grinders are armed with metal claw hands that grab, while pulling victims into the gigantic fan blades mounted in the middle of their chest, mulching and shredding enemies like a blender.