Machinery & plant engineering
Small batches · welded assemblies · manufacturing from CAD · assembly work · stainless steel & aluminium · system components
What matters in machinery and plant engineering
The challenge often lies between the operations.
In machinery and plant engineering it is not the quality of a single part that decides the outcome. Different processes, tolerances, weld distortion, bought-in parts, surfaces, variants and assembly all have to come together in the end as a working assembly. A drawing can be geometrically unambiguous and still pose a demanding manufacturing task, because in reality several processes act on one another:
- laser cutting affects the starting geometry
- bending changes dimensional chains
- welding introduces heat and distortion
- surface finishing alters edges and visible surfaces
- assembly shows whether every interface really does fit
On more complex assemblies, then, what matters is not only whether a shop has mastered each individual operation but whether it understands the whole sequence. That is exactly where depth of in-house capability pays off.
A design becomes a manufacturing process under control.
Review CAD data and drawing
Fix the production sequence
Make the parts
Source and fit the components
Test and deliver ready to install
Fewer interfaces. More finished assembly.
A machine builder can split a welded assembly up: laser shop → bending shop → welding shop → grinding shop → assembly shop → final assembly in house. Or it can hand a larger share of the responsibility to one manufacturing partner. The advantage is not only fewer purchase orders:
- fewer handover points
- less transport between stages
- less finger-pointing when dimensions go wrong
- one coordinated production sequence
- one contact for the complete assembly
A small batch is not simply “less series production”.
Machine and plant builders rarely need millions of parts. More typical are one-off machines, customer-specific plant, modular systems, variants, spares and repeat parts, pre-production runs and small to medium lot sizes – and drawing revisions change over the life of the product. The challenge is therefore: how do you make a small quantity economically and still repeat it reliably later? CAD-based production planning and stored manufacturing data are particularly valuable here.
Keeping variants under control
Machine parts often look almost identical but differ in decisive places: a different connection, a different length, an extra hole, a moved sensor position, a different sheet thickness, a customer-specific version. Clean allocation of drawing revision → manufacturing data → parts list → order is exactly what counts here.
Making variants takes more than flexibility. It takes data under control.
Welded assemblies: geometry does not end at the weld.
Welding changes a part: heat input brings shrinkage, stress, distortion, altered surfaces and dimensional deviation. On complex machine assemblies it therefore has to be settled before welding how the part is clamped, in what order it is welded, which tolerances are critical and whether straightening or dressing will be needed afterwards. That is precisely why experienced specialist welders at stainlesstec are not simply production staff – they are part of our process expertise.
When tolerances add up across several parts
On a single part a tolerance can be looked at in isolation. In an assembly, cutting, bending, welding, machining and assembly tolerances all add up – a part can be “within tolerance” on its own and the assembly still not work properly. At the production planning stage we therefore establish:
- Which dimensions are functionally decisive?
- Which interfaces have to be fixed first?
- Where are fixtures needed?
- Which dimensions are only checked on the finished assembly?
- Where would a design change make production more robust?
Typical components for machine and plant builders
Welded assemblies
Machine enclosures and cladding
Process and pressure vessels
Hoppers, cones and transitions
Sieves and filter components
System components
Special parts to drawing
Stainless steel is not automatically the best answer.
Different requirements dominate in different applications: corrosion resistance argues for stainless steel, weight for aluminium – and material and process always belong together. We would not want you to think we “always sell you stainless steel”: we make parts to the material you specify. If your project calls for other metals, we will say plainly what our shop can sensibly do – and what it cannot.
From component to plug-and-play unit.
Sheet metal
Single part
Welded assembly
Mechanical assembly
Pneumatics / hydraulics
Electrics
Testing
Ready-to-install system component
The further we complete an assembly, the fewer manufacturing interfaces are left with you.
Quality and documentation.
Not every machine building project needs an industry-specific certification – but almost every professional project needs defined requirements for materials, drawing revisions, tolerances, weld execution, testing, surfaces, marking and, where applicable, material certificates. We therefore argue less with certificate logos and more with process reliability:
Whatever is specified has to be realised repeatably in production and verified traceably.
The Machinery Regulation and manufacturer responsibility
EU Machinery Regulation 2023/1230 applies from 20 January 2027 and covers machinery and, among other things, partly completed machinery. For working with us the position is this: in contract manufacturing, stainlesstec produces to the customer’s technical requirements and the agreed scope of supply. Whether manufacturer obligations for machinery or partly completed machinery arise from that depends on the project and on where responsibility lies.
Typical situations in which we become interesting
Your own shop is at capacity.
An assembly involves too many supplier interfaces.
The part is too special for a general subcontractor.
You only need small quantities.
An existing design has to be changed.
You want to buy in a finished system component.
What we need for a quick feasibility check
The better the input data, the sooner we can talk about production. Ideally, send us:
- STEP / CAD data
- technical drawing
- parts list, if available
- material
- quantity and expected repeat volume
- critical tolerances
- welding requirements
- surface requirement
- bought-in and standard parts
- scope of assembly
- the tests wanted
- the delivery date wanted
- the documentation required
Why stainlesstec for machine and plant builders?
Deep in-house capability
CAD meets shop-floor experience
From part to system component
Flexible at small quantities
Materials expertise
Let’s talk about your project.
Send us your drawing or CAD data by email – together with material, batch size and your requirements. We will come back to you with a sound assessment.
or write directly to info@stainlesstec.de – simply attach your drawing, STEP or DXF file.
DIRECT LINE: +49 5121 690 85-0