Differences between robots and CNC Machines

CNC machines are widely accepted as producing more accurate results than robots. Robot accuracies can be improved by calibration however, the accuracies of CNC machining can be fractions of a micron, as opposed to robots, the accuracies of which are acknowledged as 100s of a micron.

The stiffness of axes is another key difference between CNC machines and robots. CNC machines have a higher stiffness in all axes, for more robust manufacturing, as opposed to robots that have a lower stiffness.

Technical advancements in recent years in Computer Aided Design have to lead to a new approach to CNC machining, which enables a wider adoption for robots to be implemented in aiding the finishing or machining applications.

Spindle manufacturers, for example, a key part of CNC machines, are now providing high speed motorised spindles that are specifically designed for robotic machining, which features:

• => Lightweight construction (to minimise payload stress)
• => Minimised risk of contamination threats due to advanced sealing
• => Ability to operate at multiple orientations and angles

Robots offer the following characteristics which is why they are seen as aiding the CNC machining process:

• => Efficiency
• => Speed
• => Accuracy
• => Safety
• => Versatility

What materials are used for Robotic parts?

Firstly, parts for robotic applications often have a requirement to be strong, tough and lightweight. Materials such as aluminium have ideal characteristics and can easily be machined using CNC Machining.

Similarly, POM (also known as Delrin and Acetal) is commonly used for robotic parts. Easy to machine, it is known for its low friction, high stiffness and superior dimensional stability. As a low-cost plastic, it is also a very economical option.

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