Chiron 831 MT Twin
This model was not found in Chiron's current lineup when we checked on 2026-10-03 . It may be a superseded or older model; the specifications below are as we last recorded them.
Image: chiron-group.com, Chiron
Key Specifications
Max Workpiece ⌀
axes
machining type
machine design
machine bed
control
How much does the Chiron 831 MT Twin cost?
Estimated price range
Our best estimate for a mill-turn / multi-tasking machine in this class — not a quote from Chiron. Configuration moves it a long way.
Overview
Two parts at a time is the point of the 831 MT Twin. The listed figures describe a twin-spindle mill-turn machine in which every station has its own turning spindle and its own milling spindle, cutting two workpieces simultaneously with five-axis motion. Maximum workpiece diameter is 400 mm (15.7 in).
A twin layout pays off only when both stations run the same part, so it suits steady volumes far more than mixed one-off work. Each cycle yields two finished pieces, and fixtures and tooling have to be kept identical on both sides.
Beyond that the table is thin. It names a cast iron bed, a rigid column design and a Siemens SINUMERIK 840D sl control, and says the machine handles bar stock as well as chuck work. It does not give the distance between the two stations, any travel, a spindle speed, a torque or a tool count. The station spacing decides whether two 400 mm parts can really sit side by side, so ask for it first.
Full Specifications
| Parameter | Value |
|---|---|
| Max Workpiece Diameter | 400 mm (15.7 in) |
| Axes | 5-axis simultaneous mill-turn |
| Machining Type | Complete machining (mill-turn, dual part simultaneous) |
| Machine Design | STAMA heritage, rigid column architecture |
| Machine Bed | Cast iron |
| CNC Control | Siemens SINUMERIK 840D sl |
| Bar Stock | Bar stock and chuck work capable |
Specifications compiled from manufacturer literature and industry references. Not independently verified against a published spec sheet — confirm with the manufacturer or an authorised dealer before making a purchasing decision.
Strengths & Limitations
Strengths
- Twin-spindle layout machines two parts simultaneously, each station with its own turning and milling spindle
- Maximum workpiece diameter of 400 mm (15.7 in)
- Five-axis simultaneous mill-turn, from bar stock or in the chuck
Limitations
- The distance between the two stations is not listed, so the largest pair of parts cannot be confirmed
- Travels, spindle speeds, torque and tool capacity are all missing from the table
Best For
Frequently Asked Questions
01
It is listed as a twin-spindle machine with separate turning and milling spindles per station, and its machining type is given as dual part simultaneous. Two workpieces are cut in the same cycle, where a single-station machine finishes one.
02
That cannot be answered from the table. It gives a maximum workpiece diameter of 400 mm (15.7 in) but not the spacing between the stations. Until the spacing is confirmed, do not assume the full diameter is available on both sides together.
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