# INDEX-TRAUB TRAUB TNK40-8

Hardware · `TNK40-8` · verification: source checked

The TRAUB TNK40-8 is a production turning machine with two identical motor work spindles and two tool turrets, each carrying X, Z and Y axes. The main spindle takes bar stock up to 40 mm diameter and reaches 8,000 rpm with a maximum torque of 35 Nm. Driven tools in the turrets run at up to 12,000 rpm for milling and drilling in the same setup.

## Specification

| Property | Value |
|---|---|
| Category | cnc lathe |
| Weight | 5300 kg |
| Spindle max | 8000 rpm |
| Spindle power | 18.3 kW |
| Max turning length | 220 mm |
| Bar capacity | 40 mm |
| Spindle torque | 35 N·m |
| Spindles | 2 |
| Turrets | 2 |

## Connected

- Manufacturer: [INDEX-TRAUB](https://machineschema.com/manufacturer/index-traub.md)

## Study notes

- Spindle power 9.9 kW at 100% duty and 13.6 kW at 40% duty, 18.3 kW maximum; torque 19 Nm at 100%, 26 Nm at 40%, 35 Nm maximum.
- C axis resolution 0.001 degree on both work spindles.
- Chuck diameter 115 mm; turning length 220 mm.
- Upper turret: compact shank tooling, 8 stations, driven tools 12,000 rpm, 1.0/2.8 kW, slide travel X 235.5 mm, Z 258 mm, rapid traverse X 24 m/min, Z 25 m/min.
- Lower turret: compact shank tooling, 8 stations, driven tools 12,000 rpm, 1.5/4.1 kW, slide travel X 120 mm, Y ±50.8 mm, Z 254 mm, rapid traverse X 22.5 m/min, Y 25 m/min, Z 25 m/min.
- Optional single drives available for tool stations; machine can carry up to three tool carriers and one back working unit.
- Control TRAUB TX8i-s V8 with 19-inch touch screen.
- Connecting power 40 kW (47 kVA); weight 5,300 kg depending on equipment; dimensions per installation plan.

## Sources

1. [Production turning machine TRAUB TNK40](https://www.index-group.com/en/products/production-turning-machines/traub-tnk40) (accessed 2026-10-26)

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