Bearing-Supported Tool Stop Sleeve for Precise Depth and Concentricity

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Solution Overview

Problem

Existing stop adapters for drilling, milling, or countersinking tools often result in poor concentricity and inconsistent angular position due to faulty accommodation, leading to reduced machining quality.

Innovation Solution

A stop mechanism featuring a radial rolling bearing and an axial rolling bearing, which allows the stop sleeve to rotate freely about the tool shank, ensuring optimal concentricity and defined angular attachment, with the axial position of the shank sleeve and relative position of the stop sleeve defining the penetration depth, and a locking nut for secure attachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a generic microstop adapter with exchangeable tool head insertion is used, then the tool head can be exchanged as necessary, but poor concentricity and inferior machining quality occur due to faulty accommodation and accommodation play

Engineering Contradiction:

Improveexchangeability of tool headVSAvoidconcentricity and machining quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The adapter is divided into distinct functional segments: a drive shank for tool mounting, a stop sleeve for depth control, and a bearing-supported interface. This segmentation allows each component to perform its specific function optimally while maintaining overall concentricity, resolving the contradiction between exchangeability and precision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A bearing is introduced as an intermediary element between the stop sleeve and the drive shank. This bearing mediates the connection, enabling free rotation of the stop sleeve while maintaining precise concentric alignment, thus allowing tool head exchangeability without compromising machining quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If an adjustable stop sleeve with axial adjusting thread is used, then the stop depth can be set, but the angular position of the tool head in the bore depression changes disadvantageously due to operator pressure direction

Engineering Contradiction:

Improvestop depth settingVSAvoidangular position stability

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The stop sleeve is designed to rotate freely on the bearing while maintaining its axial position. This dynamic design allows the stop sleeve to accommodate angular variations from operator pressure without compromising the set stop depth, as the sleeve can rotate to accommodate the force vector changes while the bearing maintains concentricity.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If a single pivot bearing is used for the stop sleeve, then the structure is simple, but the concentricity and angular position are not sufficiently stabilized

Engineering Contradiction:

Improvebearing structureVSAvoidconcentricity and angular position

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The solution combines a radial bearing for concentric support with an axial bearing for angular stability. By merging these two bearing functions into a unified stop sleeve assembly, the patent achieves both simple structure and high precision concentricity and angular position stability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The problem is solved by adding another dimension of constraint. Instead of relying on a single pivot bearing that only constrains in one dimension, the solution introduces axial constraint through a second bearing, creating a two-dimensional constraint system that stabilizes both concentricity and angular position simultaneously.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 enhances precision and repetition accuracy in drilling, milling, or countersinking operations by ensuring accurate depth stop and angular position, allowing for the retrofitting of standard tools with improved concentricity and machining quality.

Implementation Method 1

a stop for a rotating drilling, milling or countersinking tool, by means of which a stop sleeve (16) can rotate freely about a drilling, milling or countersinking tool (10)

Methodology Applied

Scientific EffectRolling bearing: Ball Bearing

Implementation Method 2

an axial rolling bearing (48), wherein a housing washer (62) of the axial rolling bearing is supported on the stop sleeve (16), and a wave washer (64) of the axial rolling bearing is supported on the shank sleeve (22)

Methodology Applied

Scientific EffectAxial bearing support: Ball Bearing

Data Source

PatentUS11260460B2Stop for a drilling, milling or countersinking tool

Publication Date: 2022.03.01 GUEHRING KG

AI summary

A stop for a rotating drilling, milling or countersinking tool comprising a stop sleeve coupled to a radial rolling bearing in such a way that it freely rotates about the tool, an outer bearing bush of the radial rolling bearing being attached to the stop sleeve and an inner bearing bush of the radial rolling bearing being attached to a shaft sleeve that can be attached to a tool shaft of the tool. An axial rolling bearing is also provided, a housing washer of the axial rolling bearing being supported on the stop sleeve and a shaft washer of the axial rolling bearing being supported on the shaft sleeve. In a secondary aspect, the invention relates to a drilling, milling or countersinking tool provided with such a stop.