Danobat-Overbeck IRB 800
Key Specifications
Accuracy
max workpiece length
max swing over table
max grinding diameter od
internal grinding bore range
external grinding wheel
Overview
The Danobat-Overbeck IRB 800 is a CNC internal and external cylindrical grinding machine from Danobat Group, the Basque Country (Spain) machine tool manufacturer that produces a broad range of CNC grinding machines for the automotive, aerospace, and precision manufacturing industries. The Overbeck brand (acquired by Danobat) represents internal and external grinding expertise — the IRB 800 combines internal bore grinding and external cylindrical grinding capability in a single machine platform, enabling complete cylindrical workpiece grinding in a single setup.
The IRB 800's universal grinding configuration handles workpieces up to 800 mm in length between centers with swing over table up to 260 mm. The machine accommodates both external OD grinding (conventional cylindrical grinding between centers or in chuck) and internal bore grinding (using the machine's internal grinding spindle attachment). This universal capability enables shops grinding complex workpieces — spindle housings, bearing rings, precision sleeves — to complete both OD and ID grinding in a single clamping, eliminating the alignment errors introduced by re-clamping between operations.
Danobat's cylindrical grinding machines compete directly with Studer (United Grinding), Kellenberger (United Grinding), and Junker in the European precision cylindrical grinding market. Danobat's Basque Country heritage in machine tool manufacturing provides competitive pricing for European customers compared to Swiss-made United Grinding brands, while maintaining the precision and reliability required for automotive and aerospace grinding applications.
At $200,000-$350,000 new, the IRB 800 targets precision job shops and manufacturing operations requiring universal cylindrical grinding capability (OD and ID) in a single machine at competitive pricing.
Full Specifications
| Parameter | Value |
|---|---|
| Max Workpiece Length | 800 mm (31.5 in) |
| Max Swing Over Table | 260 mm (10.2 in) |
| Max Grinding Diameter Od | 260 mm (10.2 in) |
| Internal Grinding Bore Range | 10 - 150 mm |
| External Grinding Wheel | 400 x 50 mm |
| External Wheel Speed | 45 m/s |
| Work Head Speed | 1 - 500 RPM |
| Positioning Accuracy | < 0.002 mm |
| Surface Finish Od | Ra 0.05 - 0.4 µm |
| CNC Control | Fanuc 0iTF / Siemens 828D |
| Machine Weight | ~5,500 kg (12,125 lb) |
Strengths & Limitations
Strengths
- Combined OD and ID grinding in a single machine setup eliminates re-clamping alignment errors for complex cylindrical workpieces
- 800mm between centers handles shafts, spindles, and sleeves across a broad range of industrial precision applications
- Competitive pricing versus Swiss United Grinding brands (Studer, Kellenberger) at similar specifications
- Fanuc or Siemens control options provide flexibility for shops standardized on either control platform
- Danobat's Basque Country manufacturing heritage provides European automotive supply chain credibility and service support
Limitations
- Danobat's North American service presence is limited — aftermarket support outside Europe requires coordination
- Brand recognition in North American market is lower than Studer, Kellenberger, or Junker
- Universal grinding configuration typically trades some dedicated performance versus specialized OD-only or ID-only grinders
Best For
Frequently Asked Questions
01
When a workpiece has both OD and ID features that must be concentric (like a bearing ring, spindle housing, or hydraulic sleeve), grinding them both on the same machine in a single clamping produces the best concentricity between OD and ID. If the workpiece is removed after OD grinding and re-clamped for ID grinding (on a separate machine), the re-clamping introduces runout error between the OD reference and the ID being ground. Universal OD/ID grinding eliminates this error — typical concentricity achieved is < 0.002 mm when both OD and ID are ground in the same setup.
02
Danobat Group is the parent company based in Elgoibar, Basque Country, Spain. Overbeck was a German precision grinding machine manufacturer (based in Baden-Baden) that Danobat acquired. After acquisition, the Overbeck product line (internal and external cylindrical grinding machines) became the Danobat-Overbeck brand, bringing German grinding machine engineering depth into the Danobat portfolio. Current machines may be sold under either Danobat or Danobat-Overbeck branding depending on the product line and market.
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Links to community discussions. Summaries are editorial — visit the original thread for full context.
