Hermle C 42 U MT GEN2

$750,000 - $1,150,000 Updated 2026-03-19

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?

New machines run $750,000-$1,150,000 depending on control, spindle, tool magazine, and automation options. The MT adds approximately $150,000-$250,000 over the standard C 42 U GEN2.

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.