Tacchi model HD3 / 140 Heavy Duty CNC Lathe

A full machine refurbishment & CNC retrofit of a Tacchi model HD3 / 140 Heavy Duty CNC Lathe.

The machine refurbishment included regrinding of all slideways, refurbishment of the Z axis drive rack, full refurbishment of the Apron including replacement of the twin drive pinions, replacement of the X & Y axis drive ballscrews & anchor bearings, full refurbishment of the Headstock & Spindle including new spindle bearings, replacement of the 4 jaw Chuck with new, full refurbishment of the Tailstock, Baruffaldi Indexing Turret, Live Spindle Milling Unit, Grinding Unit, auto Pallet Loading System and 3 point Steadies; the hydraulic, lubrication & coolant systems have all been fully overhauled, including the coolant filtration system. In addition, the machine has been fitted with a new, fully interlocked, Perimeter Guarding System for PUWER compliance.

The CNC retrofit comprised fitting of a new Siemens 840D SL Control, new Siemens DC Spindle Drives for both the Main Spindle & Live Spindle Milling Unit, new Siemens Digital Axis Servo Drives (X, Y, Z & C), a new electrical cabinet complete with all new control gear and a complete machine re-wire.


  • Tacchi HD3 / 140 Heavy Duty CNC Lathe
  • Max. Turning Diameter: 1240mm
  • Distance B.C: 11000mm
  • Main Spindle Drive: 118Kw
  • 4 Station Baruffaldi Indexing Turret
  • Full C Axis
  • Live Spindle Milling Unit: 20hp 
  • Grinding Attachment
  • Powered Tailstock
  • Swarf Conveyor
  • Automatic Pallet Loading of the Turret,
    Milling Unit & Grinding Attachment


This is the largest Lathe rebuilt, to date, by EES and the first machine to be completed in our new premises; at a total length of 22,000mm and weighing close to 50 Tonnes, this project clearly demonstrates that EES can handle even largest of machine rebuild / retrofit projects, in-house.


  • Project Management
  • Mechanical Design (Inventor 3D)
  • Electrical Interface Design
  • PLC Software Design
  • Slideway Grinding to restore Machine Alignments
  • Ballscrew Refurbishment or Replacement
  • Spindle Refurbishment
  • Refurbishment of Gearboxes & Drive Train Systems
  • Overhaul or replacement of Hydraulic Systems
  • Re-assembly to OEM Specfications & Tolerances
  • Guarding Systems to PUWER Compliance
  • Electrical Panel Build
  • Commissioning
  • Factory Acceptance Testing
  • Site Re-installation
  • User & Maintenance Training
  • Full Documentation
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