Construction and equipment industry

Construction machinery, cranes and lifting equipment work outdoors all year round, in dust, sleet, frost and direct sunlight, often on building sites where cleaning and maintenance are limited. Components must therefore be able to withstand a combination of mechanical loading and a harsh outdoor environment, without surface treatment or fits failing after a short period of operation. We select materials and finishes with that outdoor environment in mind, not only the calculated load.

The machines are often used by different operators who do not necessarily handle the equipment in the same way, making the loads less predictable than on a fixed production line. We therefore build a safety margin into how we interpret a drawing where relevant, and we flag it if we see a detail that could become a weak point under rough handling in the field.

Salt from road de-icing in winter and moisture from rain and condensation are a regular part of daily life for equipment that works outdoors. We recommend surface treatment where ordinary structural steel is not sufficient, and we coordinate that treatment through established Danish partners, so that the component does not begin to rust before its calculated service life has been reached.

Large, heavy workpieces such as swing arms, brackets and bearing housings often have critical dimensions positioned far apart on the part, which makes it harder to hold tolerance than on a small component. We use horizontal milling on Doosan and Niigata centres with large pallets for exactly this type of workpiece, where rigidity in the fixturing is essential to ensure that bolt holes and mating surfaces end up in the correct relative position.

Bolt holes for load-bearing connections must fit without the joint being incorrectly preloaded when the component is mounted in a larger steel structure. We check positional deviations on 3D measuring equipment, not just the individual diameters, because it is the combined positioning of several holes that determines whether a flange or bracket can be mounted without having to be pressed or filed into place.

Turning up to ø400 mm covers the shafts, bushes and bearing parts that equipment manufacturers typically work with, and we keep tolerances on mating surfaces and threads consistent across the full diameter range. This is an advantage for customers who need both smaller and larger parts from the same supplier, without quality varying with size.

Load-bearing parts for cranes, lifts and construction machinery often require material certificates and traceability, because a failing component in this category can have serious consequences. We can link material certificates, process history and any heat treatment at component or batch level, so that the information can be retrieved if a question arises from an authority or during a warranty case.

We issue measurement reports on the critical dimensions the customer specifies in advance, typically bolt-hole spacing, fit diameters and flatness on mounting surfaces. The scope of documentation is agreed together with the customer, so that we document what genuinely matters for the component to be assembled and function correctly, without making the documentation work more expensive than necessary.

For heat-treated parts, we document which dimensions were checked before and after treatment, so that the customer can see that the component is not only hardened but also holds the agreed tolerances after the process. It is often precisely this step that gets overlooked when machining and heat treatment sit with different suppliers with no shared responsibility.

Design drawings for construction machinery and lifting equipment often contain information on load calculations and safety margins that the customer wishes to protect. We store drawing material securely with role-based access and readily enter into a confidentiality agreement before a new task begins, whether it is a single prototype or a multi-year framework agreement.

We are happy to engage in dialogue with the customer's designers on how a component can be made cheaper to produce without changing its load-bearing function or safety. That kind of input typically comes from our machine setters, who see the drawing through the eyes of production, and the decision always rests with the customer.

For multi-year framework agreements, we place emphasis on stable capacity and a fixed point of contact, so that the customer does not experience variation in quality or lead time because the task is moved between different employees. Experience with a particular family of components is gathered and retained internally, so that it is not lost if an individual employee changes role.