Hermle C 42 U MT GEN2

Est. $750,000 - $1,150,000 Updated 2026-08-10

Key Specifications

Spindle Taper

HSK-A63

Rapid Traverse

45 (60) m/min X/Y, 40 (60) m/min Z

Accuracy

+/- 0.005 mm (0.0002 in)

Repeatability

+/- 0.003 mm (0.00012 in)

x axis travel

800 mm (31.5 in)

y axis travel

800 mm (31.5 in)

Overview

The Hermle C 42 U MT GEN2 is the mill-turn variant of the updated C 42 U GEN2, combining full simultaneous 5-axis milling with integrated turning capability on the C-axis table. The GEN2 upgrade brings faster rapids, doubled table capacity, and the latest control platforms to Hermle's most popular mill-turn model.

X/Y/Z travels are 800 x 800 x 550 mm (31.5 x 31.5 x 21.7 in) with an 800 mm (31.5 in) diameter trunnion table rated for 1,400 kg (3,086 lb). The C-axis table uses a direct-drive torque motor capable of turning at up to 800 rpm, delivering smooth surface finishes that rival dedicated turning centers on many operations. The A-axis provides +/- 120 degrees of swivel for maximum workpiece access.

The standard milling spindle runs at 18,000 rpm HSK-A63 with 29 kW (39 hp) continuous power, with options spanning 15,000 to 42,000 rpm. Rapid traverse is upgraded to 45 m/min (1,772 ipm) on X/Y with optional 60 m/min, and 40 m/min on Z with optional 60 m/min. The tool magazine holds 42 positions, expandable to 252.

The mineral-cast base weighs approximately 14,000 kg, providing the mass needed to handle combined milling and turning forces. Control options include Heidenhain TNC7 or Siemens SINUMERIK ONE with full mill-turn cycle support. Positioning accuracy is +/- 0.005 mm with repeatability of +/- 0.003 mm.

The C 42 U MT GEN2 is the sweet spot in Hermle's mill-turn lineup — it handles most medium-sized parts that need both 5-axis milling and turning. New pricing runs $750,000-$1,150,000.

Full Specifications

Parameter	Value
X Axis Travel	800 mm (31.5 in)
Y Axis Travel	800 mm (31.5 in)
Z Axis Travel	550 mm (21.7 in)
A Axis Swivel	+/- 120 degrees (240 degrees total)
C Axis	360 degrees continuous (up to 800 rpm for turning)
Table Diameter	800 mm (31.5 in)
Table Load Capacity	1,400 kg (3,086 lb)
Spindle Speed	18,000 rpm standard; 15,000 to 42,000 rpm options
Spindle Motor	29 kW (39 hp) continuous
Spindle Taper	HSK-A63
Tool Magazine	42 positions (expandable to 252)
Turning Speed	Up to 800 rpm on C-axis
Rapid Traverse Rate	45 (60) m/min X/Y, 40 (60) m/min Z
Positioning Accuracy	+/- 0.005 mm (0.0002 in)
Repeatability	+/- 0.003 mm (0.00012 in)
Machine Base	Mineral cast
CNC Control	Heidenhain TNC7 or Siemens SINUMERIK ONE
Machine Weight	14,000 kg (30,865 lb)
Power Supply	400V, 3-phase, 50/60 Hz
Traverse Path	800 x 800 x 550 mm
Body	Ø 800 / H 560 mm
Collision Circle	Ø 990 mm
Vertical Table Clearance	max. 700 mm
Rotational Speed	15000/16000/20000/25000/42000 1/min
Rapid Traverse Linear X Y Z	45 (60)–45 (60)–40 (60) m/min.
Swivelling Rotary Table	Ø 800 x 630 mm
Max Table Loading	1400 kg

Specifications sourced from hermle.de — verified 2026-03-28

Strengths & Limitations

Strengths

Done-in-one 5-axis mill-turn eliminates part transfers between milling and turning machines
1,400 kg table capacity handles substantial medium-sized workpieces in steel and titanium
800 rpm C-axis turning via direct-drive torque motor for excellent surface finish
252-tool magazine option supports complex multi-operation programs without setup changes
Faster 45/60 m/min rapids reduce non-cutting time vs the original C 42 U MT
Choice of TNC7 or SINUMERIK ONE with full mill-turn programming support

Limitations

Starting price near $750,000 is a significant capital commitment for mill-turn capability
800 rpm turning is adequate but not competitive with dedicated turning centers for heavy turning
14,000 kg machine weight requires proper foundation engineering
Mill-turn programming requires operators skilled in both milling and turning cycles

Best For

Aerospace component production combining 5-axis milling with turned features like bores and faces Mold and die shops needing turned cores and cavities in a single setup Medical device manufacturers producing mid-size implants with both contours and diameters Precision job shops consolidating milling and turning into one machine Production shops running mixed-feature parts that currently require multiple setups

Frequently Asked Questions

01 What changed from the original C 42 U MT to the GEN2?

The GEN2 doubles table load to 1,400 kg, increases rapids to 45/60 m/min, adds TNC7 and SINUMERIK ONE controls, and offers new spindle speed options. The mill-turn capability with 800 rpm turning remains the same.

02 What does a Hermle C 42 U MT GEN2 cost?

Hermle quotes the C 42 U MT GEN2 per configuration and publishes no list price. The MT designation, meaning the turning-capable C-axis running to 800 RPM on a 1,400 kg table, is quoted well above the standard C 42 U GEN2, and beyond that the variables are spindle choice (18,000 RPM standard, with options from 15,000 to 42,000 RPM), the magazine at 42 pockets expandable to 252, the control choice between TNC7 and SINUMERIK ONE, and any RS or HS pallet automation. Turning on a milling machine brings tooling and balanced workholding requirements the machine quote will not cover. Ask Hermle to quote against a specific part, since the MT only pays for itself if you genuinely eliminate a turning setup.

03 What turning operations can it perform?

OD/ID turning, facing, boring, grooving, and threading. The 800 rpm maximum speed and direct-drive motor handle most turning operations on medium-sized parts.

04 How does it compare to the C 52 U MT?

The C 52 U MT offers 200 mm more X, 300 mm more Y, 200 mm more Z, and 600 kg more table capacity. Choose the C 42 U MT GEN2 if your parts fit within 800 mm and you want the latest GEN2 control and drive technology.