Chiron 831 MT
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 It may be a superseded or older model; the specifications below are as we last recorded them.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
spindle configuration
machining type
machine design
machine bed
How much does the Chiron 831 MT 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
The 831 MT is listed as a five-axis simultaneous mill-turn machine for complete machining from bar or chuck, with a maximum workpiece diameter of 400 mm (15.7 in). That diameter is the only dimension among the listed figures, and it sets the size class: chuck parts up to 400 mm across, turned and milled without moving to a second machine.
The spindle row describes separate turning and milling spindles. The part is held and rotated by one spindle while a dedicated tool spindle does the milling, drilling and contouring. The bed is given as cast iron, the design as a rigid column architecture and the control as a Siemens SINUMERIK 840D sl.
Most of what a quotation needs is absent here. Travels, spindle speeds, power, torque, tool capacity and bar diameter are not listed. This page can place the machine by part diameter and layout; the remaining numbers have to come from a data sheet for the machine in question.
Full Specifications
| Parameter | Value |
|---|---|
| Max Workpiece Diameter | 400 mm (15.7 in) |
| Axes | 5-axis simultaneous mill-turn |
| Spindle Configuration | Separate turning and milling spindles |
| Machining Type | Complete machining (mill-turn from bar or chuck) |
| 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
- Maximum workpiece diameter of 400 mm (15.7 in) for mill-turn work
- Separate turning and milling spindles with five-axis simultaneous machining
- Bar stock and chuck work are both listed, on a cast iron bed
Limitations
- No travels, spindle speeds, power, torque or tool capacity among the listed figures
- Bar work is listed, but the bar diameter the spindle accepts is not
Best For
Frequently Asked Questions
01
The listed maximum workpiece diameter is 400 mm (15.7 in). Workpiece length, weight and bar diameter are not given, so the diameter is the only limit that can be read from this page. Check length and weight before planning shaft-type or heavy chuck parts.
02
Yes, going by the listed figures. The spindle configuration is given as separate turning and milling spindles, and the machine is described as five-axis simultaneous mill-turn. Speed, power and tool interface are not given for either spindle.
03
The listed figures call it capable of both bar stock and chuck work, and give the machining type as complete machining from bar or chuck. The bar diameter is missing, so compare your stock sizes with a data sheet before counting on bar feed.
Comparisons
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