Bearing-Mounted Tool Stop for Precise Depth and Concentricity
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Solution Overview
Problem
Existing microstop adapters for drilling, milling, or countersinking tools often result in poor concentricity and inconsistent angular position due to interchangeable tool heads, leading to reduced machining quality.
Innovation Solution
A stop system where a stop sleeve rotates freely on a tool shaft via a sliding or roller bearing, allowing direct attachment to a thread-free tool shank, ensuring optimal concentricity and precise depth adjustment without radial thickening, and can be retrofitted onto various tools using clamping or adhesive methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If interchangeable tool heads are used in microstop adapters, then tool versatility is improved, but concentricity and angular position precision deteriorate
Solution Approach 1:
The invention extracts the problematic interchangeable tool head interface from the system. Instead of using interchangeable heads with varying concentricity, the patent integrates the stop mechanism directly onto a single tool shank, eliminating the interface between adapter and tool head that causes concentricity errors and angular position variations.
Solution Approach 2:
The stop mechanism and tool shank are merged into a single integrated unit. The stop sleeve is directly mounted on the tool shank via a bearing, creating a unified structure that ensures optimal concentricity and defined angular position while maintaining the depth stop function.
2Measurement precision
If a threaded portion is added to the tool shank for stop attachment, then stop adjustment precision is improved, but the tool shank radius increases radially
Solution Approach 1:
Instead of adding a threaded portion that increases the radial dimension of the tool shank, the invention moves the attachment mechanism to the axial dimension. The shank sleeve is pushed axially onto the smooth shank and secured by clamping or adhesive, maintaining the original radial profile while enabling precise stop adjustment through axial positioning.
3Ease of manufacture
If clamping or adhesive methods are used to attach the stop to the tool shank, then ease of retrofitting is improved, but attachment strength may be compromised
Solution Approach 1:
The invention introduces a shank sleeve as an intermediary component between the stop mechanism and the tool shank. This sleeve can be attached using simple clamping or adhesive methods for ease of retrofitting, while the bearing within the sleeve provides strong mechanical coupling for the stop function, effectively separating the retrofitting requirement from the strength requirement.
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 solution provides improved concentricity and defined angular position, enhancing machining precision and versatility by allowing attachment to any tool shank without the need for threaded sections, thus overcoming the limitations of prior adapters.
Implementation Method 1
a stop sleeve (16) arranged on the drilling tool (10) so as to rotate freely by means of a plain or roller bearing (14, 46)
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to a stop (12) for a rotating drilling, milling or countersinking tool (10) which comprises a stop sleeve (16) which is freely rotatably coupled, by means of a sliding or rolling bearing (14), around the tool (10). A first bearing bush (18) of the bearing (14) supports the stop sleeve (16). A second bearing bush (20) of the bearing (14) sits in a rotationally fixed manner on a shaft sleeve (22). The shaft sleeve (22) can be pushed and fastened on a shaft (28) of the tool (10). In a secondary aspect, the invention relates to a drilling, milling or countersinking tool (10) having such a stop (12).