The document discusses retrofitting CNC machines by replacing outdated parts and systems. Retrofitting is a cost-effective way to modernize large, aging machine tools rather than discarding them. Key factors in selecting machines for retrofitting include geometric accuracy and mechanical condition. Retrofitting can involve rebuilding components or a full remanufacturing. Benefits include extending the life of existing machines, adding new capabilities, improving accuracy and productivity, and reducing costs compared to a new machine.

1. CNC RETROFITTICNG
VIKAS KUMAR SINGH
CAD-CAM

2. INTRODUCTION
Retrofitting refers to the process of replacing the
old or outdated parts with new or updated part.
Retrofit means up gradation.
In CNC machines the servo system and spindle
system are replaced.

3. OBJECTIVE
COST-EFFECTIVE
MODERNISATION.
LARGE SIZE & COSTLIER AGEING
MACHINE TOOLS NEED NOT BE
DISCARDED.
RETROFITTING IS A STEPPING
STONE TO A FULL FLEDGED CNC
TECHNOLOGY.

4. FACTORS FOR SELECTION
GEOMETRIC
ACCURACY.
SOUND
MECHANICAL
CONDITION.
AVAILABILITY
OF SPACE ON
THE MACHINE.
UPGRADATION
OF OBSOLETE
CNC SYSTEM.

5. CNC Retrofitting
Rebuilding
Remanufacturing

6. Rebuilding
Rebuilding typically includes the repair or
replacement of some worn mechanical
components.
Ball screws, lubrication pumps, safety
interlocks, guards, hoses, belts and electrical
wiring.

7. Remanufacturing
Replace mechanical components to the
original, “as new”, factory specification.
Machine will be completely disassembled,
cleaned, inspected, repaired and painted.

8. Why retrofit?
Existing Machine size, use, quality and versatility not found on a new
machine at any price.
Machine parts not possible with old control.
Reduce the time it takes to make most parts, In some cases we have
reduced the time factor on like-parts from 24 hours to as little as 5 hours.
Continuous machining, No hesitation. Smoother machine action, Faster
rapids, Faster feedrates
Much easier programming, More programming features.

9. PC based, easy to update, easy to add-on accessories.
Software updateable, Never becomes outdated.
Use new CNC features not available with old control such as Digitizing,
Engraving, 4th axis and Probing.
Upgrade a 2 1/2 axis machine to a True 3 or 4 axis CNC.
Centroid offers a complete solution, we make retrofitting economical
and painless.
Eliminate program memory problems

10. ADDITION OF FEATURE / FACILITIES
Complete reconditioning of the machine
State of the art CNC control system with PLC.
AC / DC Digital /Analog servo feed drives for individual axes and Spindle.
Linear /Rotary position feedback systems.
Backlash free re-circulating ball screws & nuts.
Complete new wiring/panels cable drag chains.
Automatic Tool Turrets/Changers.
Hydraulic Power Packs ,Chucks & Tail-stock.
Automatic Centralised lubrication system & Coolant
Chip disposal systems & machine guard & Telescopic covers for axes.

11. Systems for retrofitting
Automation, drives, motors, services
DC motors
and
AC
servomotors
Drive
systems
for DC- and
AC
applications
Monitoring
Services
and
operating
sytems

12. Classic Bridgeport Boss 5 NC knee mill

13. Remove the old NC control

14. Mount the new CENTROID CNC control cabinet

15. Remove the old stepper motors

16. Mount the new Servo motor

17. Mount the operators console

18. Power up and checkout.

19. Milling machine CNC- Retrofit
Motors
Motor control boards
Motor cables
Communication cables
Limit switches
Logic power supply
Motor power supply
Enclosure

20. Benefits of a CNC retrofit
Lower cost - A retrofit will cost somewhere
between 1/3 to 2/3 the cost of purchasing a
new machine.
Energy savings - Electricity costs can be
reduced by as much as 30% to 50%.

21. ADVANTAGES OF CNC RETROFITTING
NEW LEASE OF LIFE
TO THE MACHINE
TOOLS THROUGH
COST EFFECTIVE
MODERNISTION
CAPABILITY
ENHANCEMENT
ADDITION OF
FACILITIES
RESTORATION OF
ACCURACIES

22. QUALITY
IMPROVEMENT
BETTER ACCURACY
PRODUCTIVITY
ENHANCEMENT BY 100-
200% By
CYCLE TIME REDUCTION
REDUCTION IN
REWORK/REJECTION
REDUCTION IN DOWN
TIME
FLEXIBILITY OF
OPERATION &
PROGRAMING
CAPABILITY OF ON-LINE
PROGRAMMING /
MONITORING
THROUGH LAN/ DNC

23. Hazards & Risks
Retrofitting subjected to the mechanical hazards.
Entanglement with rotating parts
Contact with sharp tool
Shearing, crushing, & ejection.