Hunt's No. 4 Oil Cake Breaker

Oil cake was made from the dried, compressed pulp left when oils seeds such as rape had been extracted to remove the oil. The Cake was sold as animal feed, but it needed to be broken into small pieces on the farm before suitable for feeding to the livestock. Mills like this were usually originally hand-powered via a large handwheeel (see Riches & Watts mill below), but many were converted later to be driven by machine by the simple expedient of replacing the handwheel with a pulley wheel.
	This particular mill was bought without either a hand whel or a pulley. A pulley has been obtained to facilitate its automation. The bearings (simple holes in the cast iron side castings) may also need to be bushed to make it run better under power.
The cake breakers from a number of manufacturers appear to use identically shaped and sized castings, though they often have company-specific casting numbers and makers marks - was there some collaboration between companies making this type of equipment? Bentall and Bamford mills are very similar in appearance but have the added sophistication of guards for the gear wheels. Some makes have spoked large gear wheels.

Other Mills of almost identical design -

Bentall mill	Manufactured by George Brown of Leighton Buzzard
Riches & Watts Mill (photo courtesy Richard Adamek)	Bamfords Mill