Bolton's International Catalogue
Glen Creston Ltd
Cross Beater Mill
For crushing soil, bricks, concrete, rock, cement clinker, coal, glass,
ores, minerals, rare earth products, chemicals, spices, grain and hundreds
of other materials up to medium-hard range.
- 200gm to 50kg/hr
- Feed size up to 30mm
- Coarse, medium or fine grinding
- Linings available in cast iron, chrome steel and stainless steel
The deservedly popular Cross Beater Mill is used for crushing and grinding
a wide assortment of materials up to the medium-hard range, within a
variety of industries, including construction, environmental, mineral,
chemical, agricultural and ceramic. The mill is remarkable for combining
small size with strength and power for heavy duty application and continuous
Controlled by a regulator material passes from the hopper into the
grinding chamber, where it is pulverised between the hard grooved door
and chamber linings, as well as by the impact of the three rotating
beater tips on the beater arms.
The mill processes samples from 200 grams up to a maximum of about
50kg/hr, with an initial lump size of up to 30mm down to a finest end
particle size of approximately 50 microns. For continuous throughput,
material is fed into the mill by means of a vaibratory feeder fitted
above the hopper. output varies according to the nature of the product
and the screen mesh size.
Interchangeable screens, with fourteen different hole diameters, determine
the final particle size. The bulk of the ground product is reduced to
a size much finer than the screen holes. For example, when grinding
friable, medium-hard substances using a 0.5mm screen, the approximate
percentages which pass through the following BS mesh sieves are:-
- 100% through BS mesh 72 (0.212mm)
- 98% through BS mesh 85 (0.18mm)
- 95% through BS mesh 100 (0.15mm)
- 70% through BS mesh 150 (0.106mm)
- 40% through BS mesh 200 (0.075mm)
Screens are changed quickly and simply by sliding them in and out of
the recess provided. They are available in stainless steel with the
following hole sizes:- 0.12, 0.2, 0.25, 0.5, 0.75, 1.0, 1.5, 2.0, 3.0,
4.0, 5.0, 6.0, 8.0 and 10mm, and in heavy duty carbon steel with hole
sizes:- 6.0, 8.0 and 10mm.
The housing is of heavy duty cast iron. The grinding chamber lining
and door lining are available in cast iron, chrome steel and stainless
steel, beater arms in cast iron and stainless steel, and beater tips
in chrome steel and stainless steel. cast iron is the hardest of the
three, the least expensive and most frequently used. Chrome steel is
usually selected for grinding abrasive materials. stainless steel is
used for applications demanding improved chemical resistance, as well
as for food and pharmaceutical applications.
- A stainless steel cross-bar is fitted across the top of the feed
hopper, restricting hand access but allowing unobstructed passage
for the product.
- The mill cannot be switched on untill the door is fully closed.
- A brake motor, operated by a fail-safe micro-switch, brings the
beater arm to an instant halt if the door is opened during operation.
- A specially designed outlet chute prevents access to moving parts
from underneath, even with the screen removed.
- Beater tips can be resharpened and their position can be re-adjusted
to maintain performance
- The mill can be stand-mounted or bolted to a bench
- A 5-litre receptacle with filter tube and clamps is included
- A 30-litre receptacle is available as an optional accessory (customers'
own containers or sacks can be attached, if required)
- Dust-free and easy to clean
The mill is powered by a 1.1 kW 3000 rpm motor, supplied for use on
single-phase or three-phase power supplies. (other voltages can be supplied
on request.) An integral mill-mounted push button starter and motor
protection device are fitted as standard.
Dimensions & weight of mill, stand-mounted (approx.):- 113 H x
56 W x 70cm D.
52kg nett, 62kg gross.
Sample Mixer Mill M. 280
- Fast, accurate sample preparation to the most stringent requirements
of analytical spectroscopy and analytical chemistry
- Ultra-fine grinding and homogenous mixing, dry or wet
- Grinding and mixing containers available in Alumina, Agate, Polystyrene,
Hardened Stell, Tungsten Carbide and Zirconia
- The M. 280 has been an industry standard for more than 30 years
- Also used for blending, diluting, dispersing, emulsifying, etc
- Completely uniform distribution of constituent components is achieved
so that even the smallest part will be truly representative of the
- The entire sample can be recovered - there are no losses during
grinding or mixing
- Strict control over contamination; introduction of abraded particles
is reduced to the very minimum and kept under control by the choice
of appropriate grinding and mixing containers
- Dust-proof due to the use of closed containers, hence often used
for toxic, irritant and radioactive samples
- Grinding capacity from about 1 to 10ml
- Mixing capacity from about 1 to 50ml. (for volumes larger than 50ml,
we recommend the TURBULA Shaker-Mixer)
Size: 38 x41 x 30cm
Weight: 24kg (net), 29kg (gross)
Power: 220/240V, 50Hz, 1/3 h.p. motor
Grinding and mixing takes place in sealed containers, shaken at high
speed in a three-dimensional figure-of-eight motion. The violent and
complex movement in three mutually perpendicular directions is repeated
1,000 times per minute. Dimensions of the containers are calculated
to take full advantage of these displacements and the resulting high
Mixing is usually carried out without the addition of ball pestles.
The homogeneity achieved satisfies the stringent requirements of spectroscopy,
x-ray diffraction studies and analytical chemistry.
For grinding, one or two ball pestles are added, which crush the material
by impact. The distance of travel in each direction, the speed and dimensions
of the container are correlated in such a way that the ball travels
along the entire axis of the container and, with each movement, strikes
a different portion of the substance.
Continuously adjustable jaws on the container clamp can be easily opened
and closed to allow the use of various sizes of grinding and mixing
vessels, from 45mm to 80mm in length and up to 57mm in diameter. Containers
smaller than 45mm can be held by suitable inserts. With the appropriate
adaptor, as many as seven smaller samples can be run at one time.
The machine is supplied with a push button, 30 minute resettable timer
to ensure reproducable running times and comparable results. The mill's
sheet metal housing is coated with chemically resistant paint, and vibration-absorbing
mounting allows quiet bench-top operation. The M. 280 incorporates all
current safety requirements.
Grinding and Mixing Containers for the M. 280
The grinding containers should be harder than the material to be ground
and of a substance which will not interfere with the subsequent analysis.
Handling a sample always contaminates it. the key to a successful interference-free
analysis is to handle the sample so that contaminants are predictable,
are present only at very low levels, or are not elements sought by the
Grinding containers are available in a wide selection of materials
- alumina, agate, hardened tool steel, stainless steel, tungsten carbide,
zirconia and (particularly for mixing) polystyrene, which precludes
Containers for the Sample Mixer Mill M. 280
||Hardened Tool Steel
||Hardened stainless Steel
|Balls: No. & Dia.
||2 x 12mm
4 x 6mm
|2 x 11mm
||1 x 12mm
||2 x 12mm
2 x 9mm
||2 x 12mm
||4 x 12mm
||Screw-on, tungsten carbide
||Slip-on, alumina ceramic
||Slip-on, zirconia steel
|Grinding Capacity (max.)
|Mixing Capacity (max.)
|Wet Grinding/ Mixing
|Dry Grinding/ Mixing
*(1) Wet grinding/mixing is possible with special clamp 27-8015
*(2) Generally used for mixing only. However, certain soft substances
can be ground in polystyrene containres.
Dust/liquid seal between cylinders and end caps is effected by 'O'
rings or gaskets.
* To request further information please Email