Inline Direct Drive Drill Spindle for Precision Countersinking
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Solution Overview
Problem
Existing drill spindles with quill feed are bulky and heavy, making them incompatible with certain clamping systems and lacking the necessary rigidity for repeatable countersink depth precision.
Innovation Solution
The implementation of quill spindles with inline direct drive feed, where the feed motor and drive mechanism are aligned along the spindle's longitudinal axis, providing improved rigidity and compatibility with various clamping systems, including concentrically-disposed clamping systems, through a combination of a fluid-driven motor and a roller screw mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If existing drill spindles use offset motor or feed system configurations, then power transmission is achieved, but the spindle assembly becomes bulky and heavy
Solution Approach 1:
The patent merges the motor and feed system into a unified inline configuration where the motor is positioned directly on the spindle axis and integrates with the feed mechanism. This consolidation eliminates the need for separate offset mounting structures and intermediate power transmission components, achieving both power transmission and weight reduction simultaneously
2Manufacturing precision
If existing drill spindles use rigid systems for repeatable countersink depth precision, then drilling precision is improved, but the system becomes bulky and heavy
Solution Approach 1:
The patent replaces traditional heavy mechanical rigidity mechanisms with a streamlined inline motor-feed system that achieves necessary stiffness through optimized mechanical architecture. The direct coupling of the motor to the feed mechanism provides sufficient rigidity for precision work while eliminating bulky structural elements
3Ease of operation
If existing drill spindles use offset feed system configurations, then feed motion is achieved, but compatibility with concentrically-disposed clamping systems is reduced
Solution Approach 1:
The patent employs asymmetric positioning of the motor and feed components along the spindle axis, with the motor disposed at a specific location that clears concentric clamping systems. This asymmetric arrangement allows feed motion to be achieved while maintaining compatibility with clamping systems that surround the spindle axis
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
This configuration results in a lighter, less bulky spindle assembly that offers enhanced precision and stability, allowing for improved resistance to thermal expansion and reduced backlash, thereby enhancing drill depth accuracy and compatibility with a broader range of clamping systems.
Implementation Method 1
The feed unit includes a feed motor coupled to a drive mechanism... The spindle unit is configured to translate along the longitudinal axis by actuation of the feed motor
Data Source
AI summary
Spindle assemblies with inline direct drive feed are disclosed. In one embodiment, a manufacturing system includes a support structure configured to be positioned proximate a workpiece, a carriage moveably coupled to the support structure, and a head assembly coupled to the carriage. The head assembly includes a spindle assembly, comprising a feed unit and a spindle unit. The feed unit includes a feed motor coupled to a drive mechanism, the feed motor and the drive mechanism being disposed along a longitudinal axis of the spindle assembly. The spindle unit has an aft end operatively coupled to the drive mechanism of the feed unit, the spindle unit including a fluid-driven motor coupled to a tool collet chuck, the spindle unit being configured to translate along the longitudinal axis by actuation of the feed motor.