Starrag Mill-Turn / Multi-Tasking Machines

Starrag Bumotec S191

Est. $600,000 - $950,000 Updated 2026-10-03

Image: starrag.com, Starrag

Key Specifications

Tool Capacity

Up to 48 tools

Accuracy

±0.002 mm (±0.00008 in)

Repeatability

±0.001 mm (±0.00004 in)

bar capacity

32 mm diameter (51 mm optional)

chuck diameter max

100 mm (3.9 in)

main spindle speed

12,000 RPM

How much does the Starrag Bumotec S191 cost?

Estimated price range

Est.$600,000 - $950,000

Our best estimate for a mill-turn / multi-tasking machine in this class — not a quote from Starrag. Configuration moves it a long way.

Overview

The Starrag Bumotec S191 is a bar-fed mill-turn center for small, complex parts. The listed figures give a bar capacity of 32 mm, with 51 mm optional, a 12,000 rpm main spindle, a 10,000 rpm sub spindle and a separate milling spindle that runs to 36,000 rpm on an HSK-E32 interface.

The machine is meant to finish a part from bar in one cycle. The listed operations are turning, milling, drilling, grinding and gear-cutting, and the C axes of the main and sub spindle are synchronised, so a part can be handed from one spindle to the other and machined on its back face without being re-clamped by hand. Y travel is ±50 mm (±2.0 in), which sets how far off centre the milling spindle can work, and the maximum chuck diameter is 100 mm (3.9 in).

36,000 rpm and HSK-E32 describe small tools: fine end mills, drills and engraving-size cutters, not heavy milling. No spindle power or torque is listed. Up to 48 tools are available.

Positioning accuracy is listed as ±0.002 mm (±0.00008 in) and repeatability as ±0.001 mm (±0.00004 in), with direct-scale linear encoders on all axes. The control is Siemens SINUMERIK 840D sl. For larger bar, the Bumotec 191neo is listed with capacities of 42/50/65 mm and up to 90 tools.

Full Specifications

Parameter	Value
Bar Capacity	32 mm diameter (51 mm optional)
Chuck Diameter Max	100 mm (3.9 in)
Main Spindle Speed	12,000 RPM
Sub Spindle Speed	10,000 RPM
Milling Spindle Speed	36,000 RPM
Spindle Taper Milling	HSK-E32
C Axis	Main and sub spindle synchronized
Y Axis Travel	±50 mm (±2.0 in)
Tool Capacity	Up to 48 tools
Positioning Accuracy	±0.002 mm (±0.00008 in)
Repeatability	±0.001 mm (±0.00004 in)
Linear Encoders	Direct-scale on all axes
CNC Control	Siemens SINUMERIK 840D sl
Operations	Turning, milling, drilling, grinding, gear-cutting

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

Milling spindle listed at 36,000 rpm with an HSK-E32 interface
Main spindle at 12,000 rpm and sub spindle at 10,000 rpm with synchronised C axes
Turning, milling, drilling, grinding and gear-cutting listed as operations on one machine
Listed positioning accuracy of ±0.002 mm (±0.00008 in) and repeatability of ±0.001 mm (±0.00004 in)
Direct-scale linear encoders on all axes
Tool capacity of up to 48 tools for complete machining from bar

Limitations

Standard bar capacity is 32 mm; 51 mm is an option
Y travel of ±50 mm (±2.0 in) limits off-centre milling
No spindle power or torque is listed for any of the three spindles
HSK-E32 restricts the milling spindle to small tools

Best For

Small complex parts finished from bar up to 32 mm, or 51 mm with the option Fine milling and drilling with small tools at up to 36,000 rpm Parts needing front and back machining across synchronised main and sub spindles Work that combines turning with grinding or gear-cutting in one clamping Tolerances that call for ±0.002 mm (±0.00008 in) positioning accuracy

Frequently Asked Questions

01 What bar size does the Bumotec S191 take?

The listed bar capacity is 32 mm in diameter, with 51 mm as an option. The maximum chuck diameter is 100 mm (3.9 in). If the larger bar is needed, it has to be specified, since it is not the standard figure.

02 What spindles does the Bumotec S191 have?

Three are listed: a main spindle at 12,000 rpm, a sub spindle at 10,000 rpm and a milling spindle at 36,000 rpm with an HSK-E32 interface. The C axes of the main and sub spindle are synchronised. Power and torque are not listed.

03 Which operations can the Bumotec S191 perform?

The listed operations are turning, milling, drilling, grinding and gear-cutting. With up to 48 tools and a sub spindle, the aim is to complete a part in one cycle instead of moving it between machines.

04 How accurate is the Bumotec S191?

Positioning accuracy is listed as ±0.002 mm (±0.00008 in) and repeatability as ±0.001 mm (±0.00004 in). Direct-scale linear encoders are listed on all axes, which measure the slide position directly instead of inferring it from the screw.

05 Which control is listed for the Bumotec S191?

The listed control is Siemens SINUMERIK 840D sl. No alternative control appears in the listed figures, so shops that program on another system should raise it before specifying the machine.