MECHANICAL RETROFIT

A mechanical retrofit involves upgrading or restoring critical machine components to bring a CNC machine back to optimal mechanical condition. It typically includes:

  • Guideway restoration
  • Machine leveling
  • Ballbar testing
  • Laser measurement testing
  • Kinematic table correction
  • Adding rotary/tilting tables

GUIDEWAY RESTORATION

With prolonged use, guideways and slideways wear down, leading to lost precision, chatter, and backlash. A retrofit may involve:

  • Inspection, grinding or replacement of linear guides
  • Replacement of ball screws and nuts
  • Re-setting of tolerances and lubrication systems

MACHINE LEVELING

Proper geometric alignment starts with accurate machine leveling:

  • Setting machine height and leveling the base
  • Adjusting linear guides for squareness and parallelism
  • Verifying straightness of axis travel

Benefits:

  • Elimination of backlash and vibration during axis movement
  • Smoother motion and consistent force
  • Reduced wear and longer service life
  • Improved stability and precision in milling or drilling operations

Benefits:

  • Enhanced geometric accuracy of the machine
  • Correct orthogonality of axes (XY, YZ, XZ, etc.)
  • Foundation for accurate multi-axis positioning
  • Reduced distortion from uneven force distribution

ADDING ROTARY/TILTING TABLES

Retrofitting for expanded capabilities can include:

  • Installation of a 4th or 5th axis (rotary or tilting tables)
  • Mechanical modifications to the enclosure
  • Enabling true multi-axis simultaneous machining

Benefits:

  • Greater machining center versatility
  • Flexibility for complex parts at various angles
  • Fewer part re-fixturing steps
  • Time savings in setup and tool changes

KINEMATIC TABLE CORRECTION

After guideway repairs, leveling, or axis additions, kinematic tables should be updated to:

  • Compensate for mechanical deviations
  • Improve interpolation accuracy
  • Enable precise 5-axis simultaneous operations

Benefits:

  • Improved part quality and less need for manual corrections
  • More precise tool path interpolation and 3D motion control
  • Reduced deviation between programmed and actual tool path
  • Essential for high-accuracy 5-axis work