Drill Bit and Limit Stop Assembly for Centering Pin Compatibility
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Solution Overview
Problem
Existing drilling machines with no internal thread limit the use of drilling core stoppers and centering pins, requiring time-intensive and user-unfriendly working steps, and preventing simultaneous use of both during initial drilling.
Innovation Solution
A drill bit and limit stop arrangement with a central through-hole for the centering pin and fluid openings transverse to the axis of rotation, forming a coherent structural unit that allows for simultaneous use and reduces the need for separate fastening and detachment steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a drilling machine has no internal thread in the drive shaft, then the machine can be simpler in structure, but it cannot fasten drilling core stoppers or centering pins
Solution Approach 1:
The drive shaft is divided into two functional segments: an external thread portion for fastening the drill bit and a separate limit stop component with internal thread and central through-hole. This segmentation allows the limit stop to provide both the internal thread function and centering pin receptacle function without complicating the main drive shaft structure.
Solution Approach 2:
The limit stop acts as an intermediary component between the drive shaft and the drill bit. It fastens to the external thread of the drive shaft and provides the internal thread interface for the centering pin, thereby mediating the fastening function without requiring the drive shaft itself to have an internal thread.
2Measurement precision
If a centering pin is fitted in the drive shaft for initial drilling, then positioning accuracy is improved, but it prevents simultaneous use of a drilling core stopper
Solution Approach 1:
The fastening function is segmented between the drill bit (external thread) and the limit stop (internal thread with central through-hole). This allows the centering pin to be accommodated in the limit stop's central through-hole while the drill bit remains fastened to the drive shaft, enabling both functions to operate simultaneously.
Solution Approach 2:
The limit stop serves as an intermediary that reconciles the conflicting requirements of using both a centering pin and a drilling core stopper. By providing a dedicated central through-hole for the centering pin while maintaining its own fastening capability to the drive shaft, it enables both components to coexist without interference.
3Ease of manufacture
If the drill bit and limit stop are fastened separately, then each component can be optimized independently, but the number of working steps increases
Solution Approach 1:
The limit stop and drill bit are merged into a integrated assembly where the limit stop is permanently or semi-permanently attached to the drill bit. This merging reduces the number of separate fastening and detachment steps required, as both components are installed and removed together as a single unit, while still allowing independent optimization of each component's design.
Data Source
AI summary
An arrangement includes at least one drill bit and at least one limit stop for a drilling core, or parts of a drilling core, forming in the course of drilling. The at least one limit stop has at least one fluid opening transverse to an axis of rotation of the at least one drill bit, and the at least one limit stop has a central through-hole for receiving a centering pin.