Ground Bar
Buying finished ground bar is usually a more cost effective and productive alternative to grinding internally.
Quality for efficient production
Ovako’s ground bar is characterised by straightness, good out of roundness and a fine surface. These are important properties as they contribute to smooth and trouble-free production, especially when it comes to high machining speeds and accurate, vibrationless feeds in automatic lathes. Straightness is also particularly important when producing components from long bar. In addition, our ground bar has a minimum of internal stresses, which significantly reduces the risk of distortion after machining. Ovako’s ground bar is therefore a favourable material for the manufacturing of products like long shafts, rolling bearings and ball bushings.
Ground bar in three quality classes
To simplify the selection of the most suitable quality, ground bar is available in three product groups:
Rough ground bar
Fine ground bar, standard execution
Fine ground bar, special execution
Advantages of ground bar
- Smooth production especially at high machining speeds
- Accurate and vibrationless feed movements in automatic lathes
- Reduced risk of distortion after machining
- Ground material offers a surface quality “ready to use”, requiring no further processing by the customer
Ground bar product properties
| Rough ground bar | Fine ground bar,standard execution | Fine ground bar,special execution | |
| Size range | Ø 12 to 100 mm | Ø 12 to 100 mm | Ø 12 to 100 mm |
| Tolerances | ≥ IT9 | IT8 | Down to IT6 |
| Lengths | 4 to 7 m | 4 to 7 m | 4 to 7 m |
| Surface smoothness | Max. Ra 5 µm | Ra 1.0 µm | Down to Ra 0.6 µm |
| Out of roundness | Max. 50 % of the diameter tolerance,measured as the difference in diameter | Max. 50 % of the diameter tolerance,measured as the difference in diameter | Max. 50 % of the diameter tolerance,measured as the difference in diameter |
| Straightness | 0.5 mm/m | Down to 0.2 mm/m | Down to 0.1 mm/m |
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