3 Axis DRO Installation – New life for our 1974 Bridgeport

Many thanks to Gary and Kris from EEC Ltd, for the fitting & installation of a new ACU-RITE 203 – 3 Axis DRO System, to our Bridgeport Mill.

The replacement of an ailing Sony Magnascale setup has resulted in a new enthusiasm in the workshop. As can be seen from the photos EEC Ltd made an excellent job of the installation. Gary and Kris were professional, helpful and supportive throughout the process.

I have no hesitation in recommending EEC Ltd for their work,

Tony, Somerset Machining

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somerset dro company installation

Completed installation of an ACU-RITE DRO203 into a 1974 Bridgeport mill

DRO for Bridgeport Mil

DRO for Bridgeport Mill. X, Y and Z axis Acu-Rite SENC 150 linear scales fitted with using bespoke brackets and guards













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Milling, turning, grinding, boring and general purpose


2 or 3 from A to Z and Z0

Encoder Inputs


Display step

  • Adjustable, max. 7 digits

  • Linear axis: 1 mm to 0.0001 mm

  • Angular axis: 1° to 0.001° (00° 00′ 01”)


  • 3 Axes

  • 7-inch color wide screen (15:9)

  • Resolution 800 x 480 pixels for Position Values, Dialog Messages, Input and Graphic Functions

Status Display

  • Tool

  • Reference point

  • Operating function

  • Feed rate


  • mm/inch

  • stopwatch

Axis Display


Common Functions

  • Job Clock / Stop Watch

  • Feed Rate Display

  • Multiple Language Support

  • Absolute/Incremental

  • Near-Zero Warning with Graphics

  • Help Function

  • 16 Tool Offsets/Diameter

  • Preset and Zero Reset

  • 4 Function Calculator/Trig Calculator

  • Instant Inch/mm Conversion

  • Position-Trac™ Home Reference System

  • Linear/Non-Linear Compensation up to ±9,999 ppm

Turning Specific Functions

  • Taper calculator

  • Radius/diameter switching

  • Freezing the tool position for back-off

  • Vectoring: X/Y display of the traverse path with inclined top slide

Milling Specific Functions

  • Bolt-hole Pattern Calculations with Graphics (full and partial circles/linear patterns)

  • Centerline Calculation establish workpiece zero and midpoints


Oblique line, circular arcs; only for milling, drilling, boring:circular and linear hole patterns

Error Compensation

  • Axis error: Linear and nonlinear over up to 200 points

  • Backlash compensation: for compensation of reversal error

Data Interface

USB 2.0 type C

  • For Output of Parameters to a USB Stick or PC

  • For Input of Parameters, Remote Control of Keys and Commands


  • Single-Position Tilting Base

  • Multiposition Holder

  • Mounting Frame

  • Protective Cover

Electrical Requirements

AC 100 V to 240 V (±10 %), 50 Hz to 60 Hz (±5 %), ≤ 33 W

Operating Temperature

0° to 45º C (32º to 113º F)

Protection EN60529

IP 40, Front Panel IP 54


~1.9 kg