Brake disc
Multiple work steps in a single tool for maximum cost efficiency.
The automotive industry requires a vast quantity of brake discs. Therefore, the production process must be 100% optimised. In this application, two distinct types of bores must be drilled and completed in the shortest possible of time.
| Workpiece | brake disc |
Bore number 1
| Bore | core bore for M8 thread |
| Chamfer | front and back: Ø8.5 mm x 90° |
| Material | cast |
Bore number 2
| Bore | Ø8.6 mm |
| Countersink forward | Ø17.2 mm x 90° |
| Chamfer backward | Ø0.5 mm x 45° |
| Material | cast |
Bore 1
Core bore is drilled in a single pass with a VEX drill combination tool and chamfered both front and back (Ø8.5 mm x 90°).
| Tool | VEX drill combination tool |
| Drilling working speed | 3,200 rpm. |
| Drilling working feed | 0.25 mm/rev. |
| Chamfering working speed | 1,900 rpm. |
| Chamfering working feed | 0.15 mm/rev. |
| Coolant | dry |
| Service life | > 30,000 bores |
Bore 2
In a single pass, this bore is drilled, then countersunk forward (Ø17.2 mm x 90°), and back chamfered (Ø0.5 mm x 45°). It is made with a special VEX drill and countersink combination tool.
| Tool | VEX drilling and chamfering combination tool |
| Drilling working speed | 2,600 rpm. |
| Drilling working feed | 0.26 mm/rev. |
| Drilling service life | > 30,000 bores |
| Chamfering forward working speed | 1,500 rpm. |
| Chamfering forward working feed | 0.15 mm/rev. |
| Chamfering forward service life | > 15,000 bores |
| Chamfering backwards working speed | 1,500 rpm. |
| Chamfering backwards working feed | 0.15 mm/rev. |
| Chamfering backwards service life | > 30,000 bores |
| Coolant | dry |
The integration of multiple machining operations in a single tool, combined with proven process capability, ensures the best possible cost efficiency.