CNC turning, milling, cylindrical grinding and component assembly for precision parts from Ø 10 mm to 2,100 mm length
Koloseus Metallverarbeitung GmbH
Karlstein am MainNew on Amplifa
About Koloseus
Koloseus Metallverarbeitung GmbH is a family-run contract manufacturer for CNC machining based in Karlstein am Main in the Bavarian Lower Main region. Founded in 1985 by Bernd Koloseus, the company manufactures precision components and assemblies with around 30 employees for the automotive, mechanical and plant engineering, hydraulics, medical technology, pump and valve, and aerospace industries. Production capabilities include CNC turning (Ø 10–250 mm, bar production up to Ø 80 mm, including hard turning up to 62 HRC), CNC milling in 3- to 5-axis configurations with traverse paths up to 2,100 × 840 × 760 mm, and CNC external cylindrical grinding with tolerances of ± 2 µm and Ra ≤ 0.2 µm. In the component assembly area, turned parts, milled parts and ground shafts are assembled in Hall 2, function-tested and delivered ready for installation. Materials portfolio: steel (also hardened), stainless steel and duplex, Inconel and Hastelloy, aluminium, brass, copper, bronze, titanium, tantalum, molybdenum, as well as engineering plastics such as PEEK and POM. All processes are certified to DIN EN ISO 9001 and ISO 14001, and first-article inspections are performed to PPAP/VDA 2 on Wenzel 3D metrology in an air-conditioned measuring room.
- Site
- Karlstein am Main
- Processes
- CNC turning, CNC milling (3-axis), CNC milling 5-axis simultaneous (swivel head), CNC cylindrical grinding (external cylindrical grinding), Component assembly (manufacturing, assembly, functional testing), Sawing & blank preparation, Sandblasting, Prototype construction
- Materials
- S235, S355, C45, 42CrMo4, Case-hardening steel 16MnCr5, Tool steel 1.2379, Tool steel 1.2842, Stainless steel 1.4301
- Certificates
- DIN EN ISO 9001:2015, DIN EN ISO 14001:2015, ISO 9001, ISO 14001, 3D coordinate metrology (Wenzel), First-article inspection PPAP / VDA 2, Material certificates 3.1 / 3.2
- Founded
- 1985
- Employees
- ca. 30
- Industries
- Automotive, Mechanical engineering, Plant engineering, Special machinery, Hydraulics, Medical technology
- 01
Enquiry with drawing (DWG/STEP/PDF/DXF)
- 02
Technical assessment & quotation within 48 h
- 03
Material procurement incl. 3.1/3.2 certificates
- 04
Sawing & blank preparation
- 05
CNC turning / CNC milling
- 06
CNC cylindrical grinding
- 07
Shot blasting / surface treatment
- 08
Assembly & functional testing in Hall 2
- 09
First-article inspection (PPAP/VDA 2) & 3D measurement report
- 10
Series production with framework call-offs, Kanban or consignment stock
Karlstein am Main Site
Karlstein am Main
DEHeadquarters, production (turning, milling, grinding) and assembly in two halls
- Lot size
- 1 – 10,000 pcs.
- Materials
- Steel, stainless steel, aluminium, brass, copper, titanium, nickel-based alloys, plastics
- Nakamura-Tome NTY³ turn-mill centre (3 turrets, 12 axes)
- Nakamura WT-300 CNC turning centre
- Nakamura WT-150 CNC turning centre with bar feeder
- Hurco VMX 84t machining centre (2,100 × 840 × 760 mm)
- Hurco VMX 60 SRTi 5-axis machining centre
- Hurco VMX 42 SR / VMX 42i machining centres
- Studer S33 CNC universal cylindrical grinding machine
- Wenzel 3D coordinate measuring machine (measuring room 20 °C ± 0.5)
- Derby-Etalon measuring devices
- Sawing machines up to Ø 300 mm
- Blasting system (sandblasting)
Components from Production
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| CNC turningMachining | ± 5 μm · Ra ≤ 0.4 μm | up to 1,200 mm between centres × Ø 10 – 250 mm (bar production up to Ø | – | 1 pc. – 10,000 pcs. | C45, 42CrMo4, 16MnCr5, 1.4301, 1.4404, 1.4571, 1.4462 (duplex), AlMgSi1, AlCu4Mg1, brass, cast bronze, bronze, titanium Grade 2, titanium Grade 5 (Ti-6Al-4V), POM, PEEK, PA6, PTFE, steel hardened up to 62 HRC (hard turning HRC 45–62) |
| CNC milling (3-axis)Machining | ± 10 μm · Ra ≤ 0.8 μm (fine milled) | 2,100 mm × 840 mm × 760 mm | – | – | S235, C45, 42CrMo4, tool steel, 1.4301, 1.4404, special alloys, EN AW-7075, EN AW-6061, EN AW-2017A, CuZn37, CuZn39Pb3, titanium Grade 2, titanium Grade 5, POM, PEEK, PA6, PTFE, PVDF |
| CNC milling 5-axis simultaneous (swivel head)Machining | ± 10 μm · Ra ≤ 0.8 μm | 2,100 mm × 840 mm × 760 mm | – | – | steel, stainless steel, aluminium, brass, titanium, plastics |
| CNC cylindrical grinding (external cylindrical grinding)Machining | ± 2 μm (roundness ≤ 1 μm, cylindricity ≤ 2 μm / 100 mm) · Ra ≤ 0.2 μm | up to 1,045 mm between centres × Ø up to 250 mm | – | – | 16MnCr5 (case hardened), 42CrMo4 (nitrided), 1.2379 (hardened up to HRC 62), 1.2842, 1.4301, 1.4404, hard chrome-plated shafts, nitrocarburized surfaces |
| Component assembly (manufacturing, assembly, functional testing)Assembly | per customer drawing | – | – | individual parts – medium series | steel, stainless steel, aluminium, titanium, plastic |
| Sawing & blank preparationMachining | – | up to Ø 300 mm | – | – | – |
| SandblastingSurface | – | – | – | – | – |
| Prototype constructionMachining | – | – | – | – | – |
| Surface treatment to DIN EN ISO 21920Surface | to DIN EN ISO 21920 | – | – | – | – |
| Testing / metrology (3D coordinate measurement, first-article inspection, PPAP/VDA)Testing | micrometre range | – | – | – | – |
12 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Turn-mill centre | Nakamura-Tome NTY³ | 1 | Ø 10 – 250 mm, bar production up to Ø 80 mm, 12 axes, 3 turrets, Y-axis, sub-spindle | – | Karlstein am Main |
| CNC turning centre | Nakamura WT-300 | 1 | Turn-mill parts up to Ø 250 mm, sub-spindle, Y-axis, driven tools | – | Karlstein am Main |
| CNC turning centre | Nakamura WT-150 | 1 | Bar production up to Ø 50 mm, bar feeder | – | Karlstein am Main |
| Vertical machining centre | Hurco VMX 84t | 1 | Traverse path 2,100 × 840 × 760 mm, 40 tool stations, HSK, thermally compensated | – | Karlstein am Main |
| 5-axis machining centre | Hurco VMX 60 SRTi | 1 | Swivel rotary table, 5-axis simultaneous | – | Karlstein am Main |
| Vertical machining centre / 5-axis swivel head | Hurco VMX 42 SR | 1 | 3-axis or 5-axis simultaneous, swivel head, tool length up to 300 mm | – | Karlstein am Main |
| Vertical machining centre | Hurco VMX 42i | 1 | 3-axis, compact machining centre for small and medium milled parts | – | Karlstein am Main |
| CNC universal cylindrical grinding machine | Studer S33 | 1 | Ø up to 250 mm, length up to 1,045 mm, CNC-controlled X-/Z-/B-axis | – | Karlstein am Main |
| Coordinate measuring machine (3D metrology) | Wenzel | 1 | Measuring room air-conditioned at 20 °C ± 0.5 | – | Karlstein am Main |
| Measuring devices | Derby Etalon | – | Ongoing inspections | – | Karlstein am Main |
| Sawing machines | – | – | up to Ø 300 mm | – | Karlstein am Main |
| Blasting system (sandblasting) | – | – | – | – | Karlstein am Main |
Additional services
Quality & Metrology
Koloseus is certified to DIN EN ISO 9001:2015 and DIN EN ISO 14001:2015. Final inspection is carried out on a Wenzel coordinate measuring machine in an air-conditioned measuring room (20 °C ± 0.5) as well as with Derby-Etalon measuring devices; first-article inspection reports to PPAP/VDA 2 and 3.1/3.2 material certificates are standard.
| Evidence | Karlstein am Main |
|---|---|
| ISO 9001 | |
| ISO 14001 | |
| 3D coordinate metrology (Wenzel) | |
| First-article inspection PPAP / VDA 2 | |
| Material certificates 3.1 / 3.2 |
History since 1985
- 1985
Bernd Koloseus founds the metalworking company in Karlstein am Main; first contract manufacturing orders for the mechanical engineering sector on the Lower Main.
- 2025
Dual certification to DIN EN ISO 9001:2015 and DIN EN ISO 14001:2015 (November 2025, each valid until November 2028).
- 2026
Construction of a second hall with approximately 300 m²; the grinding shop grows from 50 to 300 m². Samuel Koloseus takes on responsibility as junior manager in production and purchasing.