CNC Support Frame and Ball Screw Layout for Precision Machining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
CNC machines face precision issues due to low rigidity in their support structures and high manufacturing tolerances, leading to reduced accuracy and increased complexity in setup and calibration, particularly with the use of extruded aluminum elements and wheels that are prone to deformation and jamming.
Innovation Solution
A CNC machine design featuring a compound support frame with rigid metal tubing and ball screws for precise movement, along with a stiffening assembly and modular components that enhance rigidity and precision, allowing for easier setup and transport, and integrating a controller with motor actuation for self-contained operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If extruded aluminum elements are used as support structure components, then manufacturing cost is reduced and ease of manufacture is improved, but manufacturing precision deteriorates due to high tolerances and deformation
Solution Approach 1:
The patent changes the material parameter from extruded aluminum to machined aluminum or steel, which fundamentally alters the achievable tolerance range. Machined components can achieve tolerances of 0.002 inches or better, compared to 0.010 inches or worse for extruded components, directly resolving the precision issue while maintaining ease of manufacture through standardized machining processes
Solution Approach 2:
The patent employs a hybrid approach by using machined aluminum for components requiring high precision (such as guide rails and support structures) while potentially using extruded aluminum for less critical structural elements. This composite material strategy allows the system to achieve overall high precision while maintaining cost-effectiveness and ease of manufacture for non-critical components
2Ease of operation
If wheels are used for linear motion, then ease of operation is improved and device complexity is reduced, but measurement precision deteriorates due to debris deflection and wheel jamming
Solution Approach 1:
The patent replaces the wheel-based mechanical motion system with a ball screw drive system. The ball screw converts rotational motion to linear motion through precision ball recirculation, eliminating wheel-debris interactions entirely. This substitution maintains ease of operation through motorized control while achieving superior measurement precision with tolerances of 0.0005 inches or better
Solution Approach 2:
The ball screw acts as an intermediary mechanism between the motor and the moving components. Instead of wheels directly contacting the extruded elements, the ball screw provides a precision intermediary that translates motor rotation into accurate linear motion, isolating the motion system from debris contamination and achieving both ease of operation and high precision
3Manufacturing precision
If the support structure rigidity is increased, then manufacturing precision is improved, but device complexity and weight increase
Solution Approach 1:
The patent divides the support structure into modular segments that can be independently manufactured and assembled. Each module is designed with integrated rigidity features, allowing the overall structure to achieve high stiffness without requiring a monolithic complex design. This segmentation reduces device complexity by standardizing components while maintaining precision through rigid modular connections
Solution Approach 2:
The patent applies rigidity enhancements locally at critical positions rather than uniformly throughout the entire structure. High-rigidity machined components are used specifically at load-bearing and precision-critical locations (such as guide rails and spindle mounts), while less critical areas use standard extruded components. This localized approach achieves necessary precision while minimizing overall device complexity and weight
4Manufacturing precision
If the support structure rigidity is increased, then manufacturing precision is improved, but weight of stationary object increases
Solution Approach 1:
The patent changes the material parameter from lightweight extruded aluminum to denser machined aluminum or steel components where rigidity is critical. While this increases weight, it achieves the necessary precision for high-end CNC operations. The weight increase is localized to only those components where precision is paramount, rather than increasing overall machine weight uniformly
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design significantly improves precision and ease of use by reducing deformation and tolerances, simplifying setup, and eliminating the need for separate computers, while enabling operation on various surfaces and orientations.
Implementation Method 1
a motion actuator, operatively coupled to the X-direction support frame, the Y-direction support frame, the Z-direction support frame, and the tool spindle, for causing movement of the tool spindle and tool
Data Source
AI summary
A Computer Numerical Control (CNC) machine, including a computer numerical controller, the CNC machine comprising a tool spindle for holding and actuating a tool for contacting a workpiece; a support frame comprising at least one frame element carrying the tool spindle; at least one angle adjustment actuator, coupled to the support frame and the spindle for deflecting an angle of contact of the tool to the workpiece; a motion actuator for causing movement of the tool spindle and tool; an electronic controller for controlling the motion actuator.