by Thorsten Lucht, Reinbek


Drum groat cutters are used worldwide for crushing grain kernels. Unlike in other crushing solutions such as roller mills, each grain is cut across the longitudinal axis in a defined way.

This ensures a narrow particle size spectrum, a very low percentage of flour as well as a predominantly two-sided exposure of the starch structure of the grain kernels. The drum groat cutter is used in those fields of milling in which wheat, oats, rye, spelt, barley, triticale, rice, einkorn wheat, emmer, and kamut are processed.

Possible applications

The cut grain, also called "groats", is used in many different sectors.

In human nutrition, different sizes of flakes, so-called baby flakes, are produced from groats. These are both consumed as mono-components and used in muesli mixtures, muesli bars and in the bakery industry for the production of bread, rolls and biscuits.

Pure groats are also used for the production of bread and rolls in the bakery industry.

The drum groat cutter is also used in order to meet the requirements on various bulgur qualities.

Groats are mainly used for flaking, as this ensures a number of nutritional properties are obtained which promote well-being and digestibility.

In the feed industry, groated grains may be used in special structurised feed; among other things, in the production of piglet, lamb and calf feed mixtures rich in barley, to control feed consumption of parents in poultry farming, and in bird feed.

The defined cross-cutting of grains ensures the conservation of the coarse structure.

Using the drum groat cutter, a number of positive effects are obtained such as conservation of the feed structure, uniform feed intake, uniform feed conversion, improvement of physiological layering in the gastrointestinal tract, and stimulation of gastrointestinal peristalsis. Animal welfare and animal health are promoted and an animal friendly feeding is ensured.

Functional description

Via a continuously adjustable vibrating channel, the grain is fed into two perforated drums which are mounted on a horizontal shaft. Buckets arranged in the drums ensure uniform distribution of the product to be cut. Excess quantities and oversizes are discharged separately by means of an overflow.

The drums are provided with calibrated holes, the diameter of which depends on the type of grain to be cut. The lower half of the rotating drums is surrounded by a precision knife basket without shims.

The grain kernels falling through the drum holes in their longitudinal axis are cross-cut by the knives. The special precision knife basket ensures a uniform cutting pattern, a low percentage of flour, and a longer service life of the knives.

The cutting angle can be varied by different knife baskets. As a result, coarse, medium or fine groats can be produced. The service life of the knives can be increased further by laterally displacing the entire precision knife basket.

Individual shims are no longer necessary. By simply rotating the internal knife basket unit, a rapid change of the knife basket is possible if a different cutting thickness is chosen or if the knives are to be changed. The replacement times are by about 75 percent lower than in conventional machines.

Pinwheels arranged above the supporting frame prevent the holes from clogging by pushing the trapped grains back into the drum.

The capacity of the drum groat cutter depends on the grain to be processed, the purity of the input product, the uniformity, the desired cutting thickness, and the selected perforation.

A number of optimisations characterise the revised drum groat cutter type 3000.

An optimisation of the internal unit while maintaining the external dimensions was aimed at. As a result, the capacity could be significantly increased due to larger drums and an increased number of knives.


The SCHULE drum groat cutter is a versatile machine that can be used in various fields both in the food and in the feed sector. It ensures the production of a homogeneously structurised, cross-cut product at a minimum energy consumption.

Due to the newly developed precision knife basket without shims, the service and maintenance times are significantly reduced. The new geometry and the use of special metals as well as the adjustable knife basket reduce the service lives of the main wear parts.

Finally, the precision knife basket, the larger drums, and the increased number of knives ensure a higher capacity per drum as well as a uniform, high cutting quality and thus a significantly increased yield of cut grains per cycle compared to other machines available on the market.

In the pilot plant of the company F. H. SCHULE Mühlenbau GmbH, presentations and tests with the drum groat cutter can be conducted by arrangement.

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