# INDEX-TRAUB TRAUB TNK40-8B

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

The TRAUB TNK40-8B is the variant of the TNK40 production turning machine whose upper turret carries an additional B axis with a 105 degree swivel angle. It has two identical motor work spindles for bar stock up to 40 mm diameter running at up to 8,000 rpm, and two tool turrets with X, Z and Y axes. The longer Z travel of the upper turret allows the swivelling tool carrier to work over a larger area.

## 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

- B-axis swivel angle 105 degrees on the upper tool turret.
- 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; chuck diameter 115 mm; turning length 220 mm.
- Upper turret with B axis: compact shank tooling, 8 stations, driven tools 12,000 rpm, 1.0/2.8 kW, slide travel X 165 mm, Y ±50.8 mm, Z 567.5 mm, rapid traverse X 22.5 m/min, Y 25 m/min, Z 50 m/min.
- Lower turret: 8 stations, 12,000 rpm driven tools, 1.5/4.1 kW, slide travel X 140 mm, Y ±25.4 mm, Z 155 mm, rapid traverse 24/25/25 m/min.
- A further unit with 4 stations is listed with slide travel X 140 mm, Y ±25.4 mm, Z 155 mm.
- 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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