CNC Override Knob Interface for Flexible Feed and Spindle Control
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Solution Overview
Problem
Existing rotary actuators for influencing feed rate and spindle speed in machine tools lack flexibility in adapting to individual user needs, leading to limited precision and efficiency in machining operations.
Innovation Solution
An operating device with an endlessly rotatable turntable and graphical user interface allows manual adjustment of feed speed and spindle speed, enabling customizable relationships between rotation angle and percentage settings, and allowing for predefined operating sequences to optimize feed and spindle speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single feed override is used for both working feed and rapid traverse, then device complexity is reduced, but adaptability to different machining operations is limited
Solution Approach 1:
The system dynamically switches between different override characteristics (working feed and rapid traverse) based on the current machining operation mode. The control device automatically selects the appropriate override behavior without requiring manual intervention, allowing a single physical override control to serve multiple functions with different characteristics.
Solution Approach 2:
A single feed override control element is designed to perform multiple functions by adapting its behavior according to the active operation mode. The override can function as a working feed override during machining operations and as a rapid traverse override during positioning movements, eliminating the need for separate controls for each function.
2Measurement precision
If rotary actuators with fixed stops are used, then device complexity is reduced, but precision and range of adjustment are limited
Solution Approach 1:
The mechanical fixed-stop rotary actuator is replaced with an electronic override control system that uses software-defined characteristics. The adjustment range and precision are determined by electronic parameters rather than mechanical constraints, allowing for higher precision and extended adjustment range without proportionally increasing mechanical complexity.
Solution Approach 2:
The system changes the characteristic curve parameters dynamically based on the active operation mode. Different override characteristics (e.g., linear, logarithmic, or custom curves) are applied depending on whether working feed or rapid traverse is active, allowing optimization of precision and range for each specific operation type.
3Adaptability or versatility
If separate feed overrides are used for working feed and rapid traverse, then adaptability is improved, but device complexity increases
Solution Approach 1:
Separate override controls for working feed and rapid traverse are merged into a single unified override control element. The system automatically applies the appropriate override characteristic based on the current operation mode, providing the adaptability of separate controls while maintaining the simplicity and ease of operation of a single control element.
4Manufacturing precision
If override values are changed in discrete steps, then device complexity is reduced, but manufacturing precision and control accuracy are limited
Solution Approach 1:
The discrete mechanical step-based override mechanism is replaced with an electronic control system that can provide continuous or near-continuous adjustment of override values. This substitution enables higher control accuracy without requiring complex mechanical mechanisms for fine adjustment.
Solution Approach 2:
The system changes from fixed discrete step values to dynamically adjustable override values with variable resolution. The precision of adjustment can be adapted based on the active operation mode and required precision, allowing for finer control where needed while maintaining simplicity where coarse control suffices.
Data Source
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AI summary
The invention relates to an operating device (31) for a CNC control (30) for controlling a machine tool, wherein the machine tool (20) comprises several machine axes (X, Y, Z, A, B, C) by means of which a tool (1) inserted into a tool holder (2) of a tool spindle (21) can be adjusted relative to a workpiece (5) and/or rotated about a tool spindle axis (A). The object of the present invention is to improve the flexibility of rotary controls (35, 36) for influencing the feed rate or the spindle speed of machine tools (20) with regard to adapting them to the needs of the individual user.This is achieved by the operating device (31) having at least one continuously rotatable rotary control (35, 36) that can be operated manually by an operator of the operating device (31), by means of which a feed rate at which the tool (1) moves relative to the workpiece (5) and/or a spindle speed can be manually adjusted by the operator by turning a rotary knob of the rotary control (35, 36), wherein the operating device (31) includes a graphical operator interface (32) by means of which the effect of an operating action carried out by means of the rotary control (35, 36) on the feed rate and/or the spindle speed can be adjusted.