Smart Clamp Z Origin Detection in CNC Milling
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Solution Overview
Problem
Manual measurement and data entry of X, Y, and Z origin coordinates in CNC milling machines can be difficult and inconvenient, especially for non-technical users, as it requires precise measurement of the work piece's position on the support surface and thickness, which can be time-consuming and prone to errors.
Innovation Solution
The implementation of a 'smart clamp' system that automatically determines the X and Y origins by securing the work piece and uses a sensor to calculate the Z origin, eliminating the need for manual measurement, with a controller-driven algorithm to position the spindle and support surface to contact the sensor, allowing for automatic calibration of the milling machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual measurement and data entry is used to determine X, Y, and Z origin coordinates, then the user has control over the calibration process, but the process becomes time-consuming and prone to errors
Solution Approach 1:
The system performs automatic calibration without requiring manual measurement by the user. The controller autonomously moves the support surface and spindle to contact the sensor, automatically calculates the Z origin coordinate, and completes the calibration process, making the system self-servicing for the calibration function
Solution Approach 2:
The patent replaces manual mechanical measurement with an automated sensor-based system. The sensor detects contact between the spindle and support surface, and the controller uses this feedback to automatically determine the Z origin, substituting human measurement with an automated electromechanical system
2Adaptability or versatility
If manual measurement is used to determine work piece position and thickness, then flexibility in handling different work pieces is maintained, but the ease of operation decreases
Solution Approach 1:
The clamp with sensor automatically adapts to different work piece thicknesses by detecting when the spindle contacts the support surface through the sensor. The controller autonomously adjusts the support surface position and calculates the Z origin, making the system self-adapting to various work pieces without requiring manual intervention
Solution Approach 2:
The smart clamp serves multiple functions: it secures the work piece to the support surface and simultaneously houses a sensor that enables automatic Z origin detection. This multi-functionality allows the same device to handle both work piece fixation and calibration, improving ease of operation while maintaining versatility
3Measurement precision
If a sensor is integrated into the clamp to automatically detect Z origin, then calibration accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the sensor directly into the clamp structure, combining the work piece clamping function with the Z origin detection function in a single integrated component. This reduces the number of separate parts and simplifies the overall system architecture while maintaining measurement precision
Solution Approach 2:
The clamp is designed to perform dual functions: mechanically securing the work piece and housing the sensor for automatic Z origin detection. This multi-functional design eliminates the need for separate clamping and measurement devices, reducing system complexity while improving calibration accuracy
Data Source
AI summary
A milling machine and method for automatically determining the Z origin are provided. In one embodiment, a milling machine comprises a support surface; a clamp comprising a first clamp portion and a second clamp portion to accept and secure a work piece, wherein the second clamp portion comprises a sensor; a spindle movable in a Z direction; and a controller. The controller is configured to automatically determine a position of a top of the work piece by having the spindle be positioned over the sensor and then moving the spindle in the Z direction until the controller receives a signal from the sensor indicating that a tool held by the spindle contacted the sensor. Other embodiments are provided.