Turning and grinding

Turning is the process for rotationally symmetrical parts such as shafts, axles, pins, bushings, flanges and rings.

Typical turned parts are shafts and flanges for mechanical and plant engineering, as well as large-diameter flanges and rings for wind energy and offshore.

• short and long turning for shafts and axles,
• facing and internal turning for flanges, bushings and bores,
• thread turning for external and internal threads,
• vertical turning for components with large diameters,
• shaft repair and reconditioning of worn components.

Grinding is used when functional surfaces must be particularly accurate or smooth, for example bearing seats, sealing surfaces and guideways.

• surface grinding for flat surfaces,
• cylindrical and internal grinding for shafts and bores,
• profile grinding for special contours.

You can find the complete data for all machines in the machine list on the Contract manufacturing page. We carry out milling and drilling work on turned parts, for example slots, hole patterns and threads, on our machining centres – more on this on the CNC milling page.

We machine structural steel, quenched and tempered steels and case-hardening steels such as 42CrMo4 and 18CrNiMo7-6, grey cast iron, ductile cast iron, cast steel, stainless steels up to duplex 1.4462, aluminium, titanium, bronze and brass. On request, we source the material ourselves, with a material certificate.

Many turned and ground parts require heat treatment such as hardening, quenching and tempering or nitriding. We coordinate such special processes through our manufacturing network, so you receive the finished component from a single point of contact. More about the materials on the Commodity trading page.

• fits according to ISO 286, for example H7 for a bore or h6 for a shaft, determine how two parts fit together: with clearance, as a transition fit or as an interference fit,
• geometrical tolerances according to ISO 1101 describe, for example, roundness, parallelism or position,
• general tolerances according to ISO 2768 apply to all dimensions without their own tolerance,
• roughness (Ra, Rz) describes the surface quality: the smaller the value, the smoother the surface.

Tight tolerances and very smooth surfaces increase the effort. We check your drawing to see which tolerances make technical and economic sense for your component.

• inspection of all components before delivery and a measurement report on the characteristics of your drawing,
• first article inspection report (FAI) on request,
• material certificates according to EN 10204 (2.2 or 3.1),
• traceability of material and manufacturing,
• quality management according to ISO 9001, EN 9100, EN 9120 and ISO 14001.

Drawing as a PDF, ideally a 3D model as a STEP file, material, quantity, desired delivery date and delivery location. We check feasibility free of charge and get back to you within 24 hours on working days. On request, we sign a non-disclosure agreement in advance.

The fastest way is via our enquiry form with file upload.