Precise CNC manufacturing: 3- and 5-axis milling, wire EDM and surface grinding of one-off parts and small series.
Bahl GmbH & Co. KG
Porta Westfalica-HoltrupNew on Amplifa
About Bahl GmbH & Co. KG
Bahl GmbH & Co. KG is an owner-managed contract manufacturer for precision CNC machining based in Porta Westfalica-Holtrup (North Rhine-Westphalia). The company produces complex 3- and 5-axis milled parts, wire-erodes cutting punches, dies and fine contours, and grinds functional surfaces with tight tolerances down to ±0.01 mm. Workpieces up to Ø850 mm and 500 kg are machined just as filigree small components are, including hardened materials and carbide. Materials processed include steel, stainless steel, aluminium, copper, brass, carbide and plastics such as POM. Customers come from mechanical engineering, toolmaking, hydraulics, pneumatics, electrical engineering and medical technology. Every component is inspected on a Zeiss Duramax HTG coordinate measuring machine; measurement reports are documented on request. Production runs from one-off parts to small series, complemented by material and feasibility consulting.
- Site
- Porta Westfalica-Holtrup
- Processes
- CNC milling (3- and 5-axis), Wire EDM, Surface grinding, Machining of hardened parts, Dimensional inspection / metrology (Zeiss Duramax HTG, measurement reports optional), Material and manufacturing consulting (drawing/CAD review, feasibility), Quality assurance with measuring machine (Zeiss Duramax HTG), Measurement reports/inspection protocols
- Materials
- Stainless steel in various alloys, Unalloyed and alloyed steels, Hardened steel, Aluminium and aluminium alloys, Copper, Brass, Carbide, POM plastic (polyoxymethylene)
- Certificates
- ISO 9001
- Industries
- Mechanical engineering, Toolmaking, Hydraulics, Pneumatics, Electrical engineering, Medical technology
- 01
Enquiry with drawing/CAD review
- 02
Material and manufacturing consulting
- 03
CNC milling (3-/5-axis)
- 04
Wire EDM
- 05
Surface grinding
- 06
Dimensional inspection on coordinate measuring machine
- 07
Delivery with optional measurement reports
Materials & Processes
Steel (unalloyed/alloyed)
For high-strength components in mechanical engineering, tool components and punches.
Hardened steel
Is wire-eroded and ground and is suitable for highly stressed tools and machine components.
Stainless steel
In various alloys for corrosion-resistant components.
Aluminium
Lightweight and easy to machine, for housings, fixtures and construction parts.
Copper
Due to high electrical and thermal conductivity, for electrical components and heat sinks.
Brass
Corrosion-resistant, low-wear and easy to machine, for fasteners, fittings and housings.
Carbide
Extremely hard and wear-resistant, for cutting punches, blades and long-lasting tool components, machined by wire EDM.
POM plastic
Engineering plastic with high strength and sliding properties for sliding bearings, gears and housing parts.
3- and 5-axis CNC milling
Complex geometries, free-form surfaces and undercuts up to Ø850 mm and 500 kg on DMG DMU 75/85 MonoBlock.
Wire EDM
Machining of hardened parts and carbide with tolerances down to ±0.01 mm, travel up to 600 × 400 × 375 mm.
Surface grinding
Exact flatness, dimensional accuracy and surface quality up to a working area of 750 mm.
Coordinate metrology
Inspection of every component on Zeiss Duramax HTG with optional measurement documentation.
Site
Porta Westfalica-Holtrup
DEHeadquarters and production
- Part weight / size
- up to Ø850 mm / 500 kg (milling); 600 × 400 × 375 mm
- Lot size
- One-off parts to small series
- Materials
- Steel, stainless steel, aluminium, copper, brass, carbide, POM
- DMG DMU 75 MonoBlock (3-/5-axis)
- DMG DMU 85 MonoBlock (3-/5-axis)
- GF CUT series wire EDM machine
- Charmilles Robofil wire EDM machine
- Okamoto surface grinding machine (up to 750 mm)
- Zeiss Duramax HTG coordinate measuring machine
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| CNC milling (3- and 5-axis)Machining | ±0.01 mm | – | 500 kg | One-off parts – Small series | Steel, Stainless steel, Aluminium, Copper, Brass, Plastic (POM), Hardened steel |
| Wire EDMMachining | ±0.01 mm | 600 mm × 400 mm × 375 mm | – | – | Steel, Stainless steel, Carbide, Hardened steel |
| Surface grindingMachining | – | 750 mm | – | – | Steel, Stainless steel, Hardened steel |
| Machining of hardened partsMachining | – | – | – | – | Hardened steel, Carbide |
| Dimensional inspection / metrology (Zeiss Duramax HTG, measurement reports optional)Inspection | ±0.01 mm | – | – | – | – |
| Material and manufacturing consulting (drawing/CAD review, feasibility)Engineering | – | – | – | – | – |
6 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Machining center (3- and 5-axis) | DMG DMU 75 MonoBlock | – | up to Ø850 mm, up to 500 kg | – | Porta Westfalica |
| Machining center (3- and 5-axis) | DMG DMU 85 MonoBlock | – | up to Ø850 mm, up to 500 kg | – | Porta Westfalica |
| Wire EDM machine | GF CUT series | – | up to 600 × 400 × 375 mm | – | Porta Westfalica |
| Wire EDM machine | Charmilles Robofil | – | up to 600 × 400 × 375 mm | – | Porta Westfalica |
| Surface grinding machine | Okamoto | – | Working area up to 750 mm | – | Porta Westfalica |
| Coordinate measuring machine | Zeiss Duramax HTG | – | – | – | Porta Westfalica |
Additional services
Quality & Certification
Every component is inspected on the Zeiss Duramax HTG coordinate measuring machine and documented with measurement results; on request, Bahl provides complete measurement reports and inspection protocols for audits. The complaint rate is below one percent.
| Evidence | Porta Westfalica-Holtrup |
|---|---|
| ISO 9001 |