Open gears: Geared parts for your heavy-duty use in cement and mining
Horitonzal grinding mills, kilns, dryers and coolers are often operated with open gears – and we have the tools and expertise to produce the highest quality girth gears and pinions to drive your heavy-duty cement and mining processes.
Customised open gears for your cement and mining needs
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What we offer
Big benefits for your heavy-duty operations with our open gears
Open gears describe individual and matching geared parts that are not incorporated in a common casing. In the cement and mining industries, the term ‘open gears’ usually refers to the girth gear and pinion drives of horizontal mills, kilns or dryers
The classic open gear arrangement includes the main motor, an intermediate gear unit for speed reduction and the pinion, which meshes with the girth gear. Our standardised product range, in combination with individually-designed girth gears and pinions, allows us to supply a customised power train for your specific application.
Open gears to drive your mill or kiln
We have produced girth gears and pinions in our production facility in Milan, Italy for more than 50 years. Because of the high wear resistance and homogenous crystal structure, we prefer to manufacture fabricated girth gears with forged rim material – but we are not limited to it. We can also use cast steel or ductile cast iron according to your requirements.
Our comprehensive range of girth gears is complemented by the many different types of pinions we manufacture – and we ensure that our high-grade steel pinions fit perfectly with the girth gears. With the ideal combination of material, hardness and finishing, our open gears provide long service life and smooth operation for your heavy-duty applications – extending beyond cement and mining as required.
Based on your application, available space and other individual parameters, our open gear solutions power your equipment – giving you the maximum performance from your processes.
Comprehensive geared parts
As a supplier of a large range of products for heavy-duty industry, we own an impressive number of state-of-the-art gear cutting and grinding machines. Besides producing geared parts for our various gear units in the cement and mining industries, we can also manufacture individual geared parts and matching sets for your special needs.
We have hobbing, grinding, shaping and milling machines at our disposal – allowing us to manufacture a full range of components for spur, helical and bevel gears. A machining centre for large components and our modern, precise measuring devices complete our extensive production capacity.
Type of gearing
Max. diameter of workpiece (mm)
Face width (mm)
Bevel gear milling
Bevel gear shaping
10 - 30
Internal gear shaping
5 - 30
External gear shaping
5 - 30
Internal gear grinding
2 - 32
External gear shaping
2 - 32
Girth gear external hobbing
2 - 45
Girth gear internal hobbing
2 - 25
And with a wide network of partners that extend our manufacturing capabilities even more, our product range has no limits.
The total open gear package from one source
With our adaptable, robust machining capabilities and vast expertise, we can provide complete open gear systems that meet your requirements. Based on your specifications, we can manufacture toothed parts with spur, helical, double helical or other types of gears – giving you well-matched components with smooth operation.