TNC 640



Besides milling, the TNC 640 from HEIDENHAIN is also capable of combined milling and turning operations. It is particularly well suited for milling-turning, HSC and 5-axis machining on machines with up to 24 axes. The workshop oriented and versatile control features numerous functions. It is especially attractive for the following areas of application:

  • Universal milling machines
  • Combined milling-turning machines
  • High speed milling
  • Five-axis machining with swivel head and rotary table
  • Five-axis machining on very large machines
  • Boring mills
  • Machining centers and automated machining

The optimized user interface of the TNC 640 gives you a fast overview: various color coding, standardized table editors and smartSelect—the dialog-guided fast selection of functions—aid you at your work.






MC main computer

CC or UEC controller units

BF TFT flat-panel display with soft keys (15-inch or 19-inch)

TE control panel (suitable for 15-inch or 19-inch screens)

Operating system

HEROS 5 real-time operating system for machine control


RAM memory: 4 GB

Program memory: SSDR approx. 32 GB

HDR approx. 160 GB

Input resolution and display step



Linear axes: to 0.1 µm

Angular axes: to 0.000 1°

Linear axes: to 0.01 µm

Rotary axes: to 0.000 01°

Input range

Maximum 999 999 999 mm or 999 999 999°




Linear in 4 axes

Linear in 5 axes (requires an export permit)

Circular in 2 axes

Circular in 3 axes with tilted working plane

Helical: superimposition of circular and straight paths

Block processing time

0.5 ms (3-D straight line without radius compensation)

Axis feedback control

Position loop resolution: Signal period of the position encoder/1024

Position controller cycle time: 200 µs (100 µs with option 49)

Speed controller cycle time: 200 µs (100 µs with option 49)

Current controller cycle time: minimum 100 µs (minimum 50 µs with option 49)

Range of traverse

Maximum 100 m (3937 inches)

Spindle speed

Maximum 100 000 rpm (with 2 pole pairs)

Error compensation

Linear and nonlinear axis error, backlash, reversal peaks during circular movements,
reversal error, thermal expansion

Static friction, sliding friction

Data interfaces


One each RS-232-C/V.24 max. 115 kbps

Extended data interface with LSV2 protocol for remote operation of the TNC over the
data interface with the HEIDENHAIN software TNCremo or TNCremoPlus

2 x Gigabit Ethernet interface 1000BASE-T

5 x USB (1 x front USB 2.0, 4 x USB 3.0)

HEIDENHAIN-DNC for communication between a Windows application and TNC (DCOM interface)


Fast and simple troubleshooting through integrated diagnostic aids

Ambient temperature

Operation: +5 °C to +40 °C

Storage: –20 °C to +60 °C

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