--- title: "Special Machine Building Supplier: Assemblies" description: "Special machine building supplier for welded assemblies & large parts to drawing — welded to DIN EN 1090-2 EXC3, CNC-machined, up to 50 t." url: "https://bock-gmbh.com/en/industries/machinery-special-machine-building/" language: "en" index: "https://bock-gmbh.com/en/llms.txt" --- # Special machine building supplier: welded assemblies & large parts to drawing As a special machine building supplier we manufacture complete welded assemblies and machined components to drawing — gearbox housings, ring gears, flywheels and machine tables, from the single part to the small series, to DIN EN 1090-2 EXC3 in Lorch in the Stuttgart region. Welded assemblies, gearbox housings and machine tables to drawing — from the single part to the small series. Ring gears, flywheels and slewing rings turned rotationally symmetric — turning height up to 2,400 mm. Large, heavy assemblies — safe handling on the crane system with 2×25 t. Load-bearing welded structures to the highest execution class certified in practice. Structural steel, fine-grain steel, wear-resistant steel and stainless steel from stock — with an inspection certificate 3.1 to EN 10204. ## Supplier for machinery and special machine building As a special machine building supplier we manufacture components that have to carry loads permanently in service and fit precisely: gearbox housings keep bearing seats within tolerance even under load, ring gears and flywheels rotate for years, machine tables need flat, torsionally rigid clamping surfaces. For this we combine certified welding with our own CNC large-part machining — where required, assemblies are vibration stress-relieved after welding and only then machined to final size. From saw cutting and flame cutting through welding to EN ISO 3834-2 to gantry milling, boring mill and vertical turning, everything is produced on 14,000 m² under one roof in Lorch, east of Stuttgart. That shortens lead times, avoids interfaces between several suppliers and secures seamless material traceability to EN 10204. We manufacture from the single part to the small series — as a ready-to-install single component or as a complete assembly, pre-assembled and painted on request. More than 100 specialists and a machine park with over 20 machines have been available for this since 1963. Special purpose machinery ## Typical components for special machine building We manufacture these component families for machinery and special machine building complete to drawing — welded, machined and documented: ### Special machine assemblies Complete welded assemblies to drawing and parts list — pre-assembled, painted and delivered ready for installation on request. ### Gearbox housings Welded, vibration stress-relieved and CNC-machined — dimensionally accurate bearing seats and mating faces for assembly. ### Ring gears & flywheels Rotationally symmetric components turned on the vertical lathe up to Ø 4,800 mm — gear cutting via partners on request. ### Machine tables Welded machine tables and base plates, face-milled after vibration stress relief — for flat, torsionally rigid clamping surfaces. ### Vibration frames Low-stress manufactured frames for oscillating loads — such as vibratory conveyor troughs in bulk materials handling. Further components to drawing — such as shafts, axles and counterweights — are manufactured on request. ## Materials & manufacturing depth for special machine building Over 40 material grades are held in our own stock: structural steels such as S355, fine-grain structural steels up to S1100, wear-resistant grades and stainless steels. That shortens procurement on urgent projects — and every heat stays traceable through the inspection certificate 3.1 to EN 10204. Our manufacturing depth includes flame cutting up to 200 mm on 20 × 3.5 m, press brake bending up to 1,000 t on hydraulic press brakes, plate rolling as well as shot blasting and industrial painting to EN ISO 12944 — the assembly leaves the plant coated and ready for assembly. ## Rotational parts: from requirement to machine Ring gears, flywheels, slewing rings and shafts are assigned directly to the matching machine — with real capacities from our machine park. Ring gears, flywheels & slewing rings Vertical turning up to Ø 4,800 mm and 2,400 mm turning height — gear cutting via partners on request. Ring gear blank to drawing Shafts & axles Turning up to Ø 655 mm and 2,000 mm turning length — with fits to drawing. Drive shaft of a special machine assembly Smaller turned & fitted parts Turned parts up to Ø 350 mm and 1,000 mm turning length — as a single part or small series for the assembly. Spacer rings and fitted parts for assembly ## Impressions from special machine building Real photographs from our production in Lorch – from the welded machine table with its rotary table seat to the painted gearbox housing from complete manufacturing. ## Quality, testing & documentation Load-bearing welded structures are manufactured to DIN EN 1090-2 up to EXC3 — the highest execution class certified in practice — with welding quality to EN ISO 3834-2. Every heat stays traceable through the inspection certificate 3.1 to EN 10204; as a company authorised by GSI SLV München we re-stamp materials on request. ### Non-destructive testing in-house Testing takes place before the assembly goes to your line: - VT, PT and MT by our own inspectors to DIN EN ISO 9712 (Level 2) — directly in the plant, with no external scheduling chains. - Ultrasonic testing (UT) is carried out at our plant on a project basis by certified inspection personnel of our cooperation partner. Destructive tests such as tensile tests are coordinated through accredited partner laboratories. Volumetric testing (radiographic testing RT, ultrasonic testing UT) is, insofar as commissioned, provided by qualified partners. Inspection scope to drawing, specification or execution class — documented in the inspection report accompanying the assembly. Non-destructive testing ## Why Bock as your special machine building supplier - Everything under one roof - Cutting, welding, vibration stress relief, CNC machining and painting in one plant — no transport between suppliers, one responsibility for the tolerance chain. - Large & heavy - Part weights up to 50 t and component lengths up to 26 m — safe handling on the crane system with 2×25 t. - Rotational parts up to Ø 4,800 mm - Ring gears, flywheels and slewing rings turned on the vertical lathe — with turning heights up to 2,400 mm. - Certified & documented - DIN EN 1090-2 EXC3, EN ISO 3834-2, inspection certificate 3.1 to EN 10204 and NDT Level 2 in-house — the chain of evidence accompanies the delivery. - A supplier since 1963 - 63 years of contract manufacturing for machinery and plant builders — with more than 100 specialists at the Lorch site. ## Frequently asked questions — special machine building ### Does Bock manufacture complete assemblies and gearbox housings to drawing? URL: https://bock-gmbh.com/en/industries/machinery-special-machine-building/#sondermaschinenbau-faq-fertigt-komplette-baugruppen Yes. We manufacture special machine assemblies, gearbox housings, machine tables and vibration frames complete to your drawing — welded to DIN EN 1090-2 EXC3, vibration stress-relieved, CNC-machined and, on request, painted and pre-assembled, from the single part to the small series. Welded assemblies ### Up to what diameter can ring gears and flywheels be turned? URL: https://bock-gmbh.com/en/industries/machinery-special-machine-building/#sondermaschinenbau-faq-welchem-durchmesser-zahnkraenze On the vertical lathe we turn rotationally symmetric components such as ring gears, flywheels and slewing rings up to Ø 4,800 mm and 2,400 mm turning height — gear cutting is handled by a partner on request. Vertical turning up to Ø 4,800 mm ### Up to what size and weight are assemblies manufactured? URL: https://bock-gmbh.com/en/industries/machinery-special-machine-building/#sondermaschinenbau-faq-groesse-welchem-gewicht-baugruppen Up to 50 t part weight and 26 m component length. The crane system with 2×25 t handles the parts in production; loading heavy assemblies ex works — including by abnormal-load transport — is routine here. ### Which materials are available for special machine components? URL: https://bock-gmbh.com/en/industries/machinery-special-machine-building/#sondermaschinenbau-faq-werkstoffe-sondermaschinen-bauteile Over 40 grades from stock: structural steels such as S355, fine-grain structural steels up to S1100, wear-resistant grades and stainless steels — every heat with an inspection certificate 3.1 to EN 10204. ### Why is a supplier with welding and machining under one roof worthwhile? URL: https://bock-gmbh.com/en/industries/machinery-special-machine-building/#sondermaschinenbau-faq-lohnt-zulieferer-schweissen-zerspanen Because the tolerance chain stays in one hand: the assembly is welded, vibration stress-relieved and then machined to final size in the same plant. That avoids interface risks between welding shop and machinist, shortens lead times and delivers continuous documentation from a single source. ### Does Bock as a special machine building supplier also serve customers outside the Stuttgart region? URL: https://bock-gmbh.com/en/industries/machinery-special-machine-building/#sondermaschinenbau-faq-beliefert-sondermaschinenbau-zulieferer Yes. From the Lorch site east of Stuttgart we supply machinery and plant builders throughout Germany as well as in Austria and Switzerland — enquiries come by drawing, delivery is ex works. ## Enquire about assemblies for special machine building Send us your drawing and parts list — we will assess feasibility, material availability and schedule and prepare a no-obligation quote. Certified to DIN EN 1090-2 EXC3 · inspection certificate 3.1 to EN 10204.