Tornos Sigma 8
Key Specifications
Max Spindle
Spindle Power
model designation
number of spindles
bar capacity with machining preparation
max length of part
How much does the Tornos Sigma 8 cost?
Estimated price range
Our best estimate for a multi-spindle automatic in this class — not a quote from Tornos. Configuration moves it a long way.
Overview
The Tornos Sigma 8 is the machine Tornos designates MultiSigma 8x28: an eight-spindle bar automatic whose bar capacity with machining preparation is 28 (26) mm and whose maximum part length is 90 (140) mm. The main spindles run to 8,000 rpm and are rated 11.6 (15.4) kW and 16 (20.2) Nm. Tornos gives many values as a pair like this, with a second figure in brackets, so settle with Tornos which figure applies to the configuration being quoted.
What separates this machine from a slide-only multi-spindle is end-working equipment with motors of its own. The drilling spindles are rated 5.3 (7.5) kW and 7 (9.2) Nm at up to 8,000 rpm, and a high-power drilling spindle is listed at 10.6 (15) kW and 14 (18.4) Nm. The end unit travels 200 mm on Z2. That is the equipment for deep holes, large drills and end milling that a static end tool could not manage.
The crossing slides travel 50 mm on X1 and 80 mm on Z1, and the cutting slides X17 and X18 travel 75 mm. For the second side there is a counter spindle with 330 mm of travel on Z47 and Z48, running to 8,000 rpm with 5.3 (7.5) kW and 7 (9.2) Nm, and 2 (4) tools for back operation. The axis count is given as 24 (28) linear and 9 (13) rotary.
The machine weighs about 10,000 kg, needs 87 kVA of installed power and a pneumatic supply at 6 bar, and has a cutting oil tank of up to 2,000 l. Programming is through TB-DECO.
Full Specifications
| Parameter | Value |
|---|---|
| Model Designation | MultiSigma 8x28 |
| Number of Spindles | 8 |
| Bar Capacity with Machining Preparation | 28 (26) mm |
| Max Length of Part | 90 (140) mm |
| Max Spindle Speed | 8,000 rpm |
| Spindle Motor Power | 11.6 (15.4) kW |
| Spindle Torque | 16 (20.2) Nm |
| Counter Spindle Speed Max | 8,000 rpm |
| Counter Spindle Power | 5.3 (7.5) kW |
| Counter Spindle Torque | 7 (9.2) Nm |
| Drilling Spindle Speed Max | 8,000 rpm |
| Drilling Spindle Power | 5.3 (7.5) kW |
| Drilling Spindle Torque | 7 (9.2) Nm |
| High Power Drilling Spindle Speed Max | 8,000 rpm |
| High Power Drilling Spindle Power | 10.6 (15) kW |
| High Power Drilling Spindle Torque | 14 (18.4) Nm |
| Number of Linear Axes | 24 (28) |
| Number of Rotary Axes | 9 (13) |
| Travel of Crossing Slide X1 | 50 mm |
| Travel of Crossing Slide Z1 | 80 mm |
| Travel of End Unit Z2 | 200 mm |
| Cutting Slide Travel X17 X18 | 75 mm |
| Counter Spindle Travel Z47 Z48 | 330 mm |
| Number of Tools for Back Operation | 2 (4) tools |
| CNC Control | Fanuc 30ib |
| Programming System | TB-DECO |
| Machine Weight | ~ 10,000 kg |
| Cutting Oil Tank Capacity | up to 2,000 l |
| Installed Power | 87 kVA |
| Pneumatic Group Pressure | 6 bars |
Specifications sourced from tornos.com — verified 2026-10-03
Strengths & Limitations
Strengths
- Eight spindles at up to 8,000 rpm, each rated 11.6 (15.4) kW and 16 (20.2) Nm
- Drilling spindles with drives of their own: 5.3 (7.5) kW, and a high-power version at 10.6 (15) kW and 14 (18.4) Nm
- Counter spindle with 330 mm of travel on Z47 and Z48 for back operations
- End unit travel of 200 mm on Z2 for deep end-working
- Maximum part length of 90 (140) mm, longer than the 65 mm of the MultiSwiss 8x26
Limitations
- Bar capacity with machining preparation is 28 (26) mm, so larger stock is out of range
- Back operation is limited to 2 (4) tools
- The counter spindle is rated 5.3 (7.5) kW and 7 (9.2) Nm, well below the main spindles, which limits heavy cuts on the second side
- Needs 87 kVA of installed power, a 6 bar pneumatic supply and room for a cutting oil tank of up to 2,000 l
Best For
Frequently Asked Questions
01
The table for this machine carries the model designation MultiSigma 8x28. It describes an eight-spindle bar automatic with a bar capacity of 28 (26) mm with machining preparation and a maximum part length of 90 (140) mm, programmed through TB-DECO.
02
Tornos's table gives many ratings as two figures, for example 11.6 (15.4) kW for the main spindles and 24 (28) for the number of linear axes. The table shown here does not label the bracketed figure, so ask Tornos which one applies to the configuration you are being quoted and plan on the lower figure until then.
03
The main spindles are rated 11.6 (15.4) kW and 16 (20.2) Nm at up to 8,000 rpm. The counter spindle and the drilling spindles are each rated 5.3 (7.5) kW and 7 (9.2) Nm, and the high-power drilling spindle 10.6 (15) kW and 14 (18.4) Nm.
04
The crossing slides travel 50 mm on X1 and 80 mm on Z1. The end unit travels 200 mm on Z2, the cutting slides X17 and X18 travel 75 mm, and the counter spindle travels 330 mm on Z47 and Z48.
05
Both have eight spindles. The MultiSwiss 8x26 takes 8-26 mm bar and parts up to 65 mm long, with 11.00 kW and 17.30 Nm per spindle, and weighs 15,000 kg. The Sigma 8 is listed at about 10,000 kg with a maximum part length of 90 (140) mm, and adds powered drilling spindles for end-working.
06
Installed power is 87 kVA and the pneumatic group pressure is 6 bar. The cutting oil tank capacity is up to 2,000 l, and the machine weighs about 10,000 kg. Floor space is not given in the table, so request a layout drawing.
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