Rod mills are less common than ball mills for grinding minerals. The rods used in the mill, usually a high-carbon steel, can vary in both the length and the diameter. However, the smaller the rods, the larger is the total surface area and hence, the greater the grinding efficiency 
A gristmill (also: grist mill, corn mill, flour mill, feed mill or feedmill) grinds cereal grain into flour and middlings. The term can refer to either the grinding mechanism or the building that holds it. Grist is grain that has been separated from its chaff in preparation for grinding.
The Mockmill is a home stone grain mill, and it's engineered and manufactured in Germany by Wolfgang Mock. He started making home grain mills back in the 1970s, so he's been doing it for over 40 years. It's estimated that nearly 70% of the stone mills out there are made by him.
A mill is a grinder used to grind and blend solid or hard materials into smaller pieces by means of shear, impact and compression methods. Grinding mill machine is an essential part of many industrial processes, there are mainly five types of mills to cover more than 90% materials size-reduction applications.
Grind To A Fine Flour If you will be milling wheat (wheat berries) to make flour for bread, you will want to be sure that the grain mill (flour mill) will grind the wheat berries into fine flour. Grinding / milling your own flour is ‘work’ and it takes awhile to process the wheat berries into flour. Some are better at it than others.
Stirred media Detritor (SMD) is a fluidized, vertical stirred mill designed for optimum grinding efficiency for fine and ultrafine grinding products. SMD’s feed size is typically 80% passing 100 µm and finer, but it can also handle coarser materials in various applications.