Рубрика: The History of Grinding


The 16th, 19th, and 20th centuries brought seminal changes in size-reduction technol­ogy. In each case, abundant new wealth encouraged the consumption of materials, investments in new plants, and the development of new processes and machines. This, in turn, increased the demand for size-reduction machinery with greater productivity and greater energy efficiency. In the 16th century, […]


The incentive to build large primary gyratory crushers came in the 1920s with the devel­opment of open-pit mines for copper and iron ores. The aggregate producers’ demand for a machine that would control the size distribution and shape of pebbles at a high pro­duction rate offered the incentive to build cone crushers, which had specially […]

Track-Guided Rollers

The MB mill was designed and built in 1947 by Max Berz, formerly head of the design department at von Grueber’s company. It had three large rollers that rotated in a track­ing groove and were pressed down by a thrust ring. The rollers were not fixed by roller bearings and could move relative to each […]


With the development of ball mills, studies were made to find improved means to pro­duce finer feed for ball mills. Double-roll crushers, gyratory crushers, and cone crushers were developed for this role. Using steel rods as the grinding media in tumbling mills was found to be an efficient means to make ball mill feed and […]

Rotary Querns

Mortars and pestles and saddlestone mills had several problems: the exhausting motions required of the operator, the batch nature of the processes, and the unnecessary rebreak­ing of particles that were already small enough. The invention of the rotary quern, prob­ably around 600 bc (estimates of the date of its appearance vary by several hundred years), […]

Single-Roll Crushers

Several types of single-roll mills have been built in which the solids are broken by being nipped between the rotating roll and a fixed surface. An early single-roll machine was the sledging roll crusher, which was built by Allis-Chalmers in 1911. It was a single-roll toothed crusher that was typical of a family of similar […]