[Video] CNCKeith's "How to measure Backlash" Method. Video

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CNCKeith's "How to measure Backlash" Method.



Centroid CNC backlash compensation is a feature used in CNC (Computer Numerical Control) machines to improve accuracy and precision during machining operations. Backlash refers to the small amount of play or lost motion that occurs in mechanical systems, like the ballscrew support bearings, ball nut connections, axis motor pulleys, or other components of a CNC machine, when the direction of movement changes. For example, when a motor reverses direction, there can be a slight delay or looseness before the tool or workpiece actually begins moving in the new direction. This can lead to errors in positioning and affect the quality of the machined part.
Centroid, incorporates backlash compensation into its CNC12 software and controllers to counteract this issue. The user enters the amount of backlash in the machine—typically in units like thousandths of an inch or millimeters—and then CNC12 automatically adjusts the movement commands to account for it. Essentially, when the machine changes direction, the controller adds extra movement to "take up" the slack before proceeding with the programmed path. This ensures the tool follows the intended trajectory more accurately.
In practice, backlash compensation is set up during machine calibration. The operator or technician might run tests to determine the backlash in each axis (like X, Y, or Z), and those values are entered into the Centroid control system. Once configured, the compensation runs seamlessly in the background, making real-time adjustments as the machine operates.