Authorised HEIDENHAIN distributors

ACC Systems Ltd

Industrial Automation

DRO 300

Programmable Digital Readout for 3 or 4 axes

ACU-RITE DR 300 Digital Readout 

The ACU-RITE DRO 300 is a versatile digital readout primarily for use on milling, drilling and boring machines and lathes with up to four axes. A seperate I/O unit provides switching inputs & outputs for simpel automation tasks.


The DRO 300 digital readout is designed as a sturdy upright unit with splash-proof full travel keypad for use in a workshop. It supports all operations with intuitive interactive menus on its large, easy to read color flat panel display.


The DRO 300 has the same functions as the DRO 203.

In addition the DRO 300 offers a connection for the KT130 edge finder. This allows you to define presets and datums with speed and precision. The DRO 300 supports you with special probing functions.

The DRO 300 is programmable which makes it ideal for small batch production on conventional machine tools. The DRO 300 allows you to store up to eight programs, each with up to 250 working steps. Programs are created either by keying them in step by step, or by using actual position capture (teach-in programming).

Data Interfaces

The DRO 203 has a USB port for reading and writing data and files.


Outline specifications:

DRO 300
Axes 3 or 4 axes, various axis designators
Encoder Inputs TTL
Display step Adjustable, max 7 digits
  • Linear axes: 1mm to 0.0001mm
  • Angular axes: 1° to 0.0001° or 00°00'01"
Display 7" TFT colour screen (15:9); 800 x 400 pixels
Status display Tool, reference point, operating function, feed rate, ABS/INC, mm/inch, stopwatch
Axis display Switchable between DRO1 and DRO2
  • 10 reference points
  • 99 tools
  • REF mark evaluation for distance coded or single reference marks
  • Distance-to-go mode
  • Scaling factor
  • mm/inch switching
  • Absolute-incremental display
  • Integrated help function
  • Graphic positioning aid
  • Calculator
For milling, drilling & boring
  • Calculation of positions for hole patterns (bolt hole circles, linear hole patterns)
  • Tool length and radius compensation
  • Probing functions for reference point aquisition with KT edge finder: Edge, Centreline and Circle Centre
  • Oblique line, circular arc
  • Spindle speed control (requires IOB 610 external I/O module)
For turning
  • Taper calculator
  • Radius/diameter switching
  • Freezing the tool position for back off
  • Vectoring: X/Y display of the traverse path with inclined top slide
  • Sum display for Z and Zo (axis coupling)
  • Constant Surface Speed (CSS) control (requires IOB 610 external I/O module)
Programming 8 programs with up to 250 steps
Axis error compensation
  • Axis error: Linear and multi-point (up to 200 points)
  • Backlash compensation: for compensation of reversal error
Data interface USB connection, type C
Switching I/O
  • Input for edge finder
  • Further inputs/outputs with the IOB 610 external I/O unit

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