Bottoming Tap Receiver Geometry for Deep Blind Hole Alignment
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Solution Overview
Problem
Existing thread taps and chasers face challenges when used in deep blind holes, including the need for multiple tools of varying lengths, misalignment issues, and debris buildup, which lead to inefficiencies and increased risks of cross-threading.
Innovation Solution
The design incorporates a receiver and threading section connected by an integrally formed shaft, with a cylindrical receiver that aligns the tool within the bore hole and allows for deeper penetration, along with spiral flutes for efficient debris removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If long taps and chasers are used to reach deep blind holes, then the tool can penetrate deeper holes, but misalignment between the tool and hole increases due to the distance between the driver and the hole
Solution Approach 1:
The tool is divided into two functional segments: a receiver portion that remains outside the hole for alignment and driver engagement, and a threading section that enters the hole to perform the tapping operation. This segmentation allows the alignment function to be separated from the threading function, resolving the misalignment issue while maintaining deep hole capability.
Solution Approach 2:
The receiver acts as an intermediary between the driver and the threading section. It provides a interface for the driver while the threading section engages with the hole, mediating the connection and allowing precise alignment without requiring the entire tool length to be engaged with the hole.
2Adaptability or versatility
If multiple taps and chasers of different lengths are maintained for deep blind holes, then tools can accommodate various hole depths, but tool inventory complexity and cost increase
Solution Approach 1:
The receiver threading section is designed to accommodate extensions of various lengths, making a single receiver design universal for multiple hole depths. The receiver can be paired with different length extensions to reach various depths, eliminating the need for multiple specialized tools and simplifying inventory while maintaining adaptability.
3Length of moving object
If long tools are used for deep blind holes, then deeper holes can be accessed, but clearance distance requirements increase limiting where the tool can be used
Solution Approach 1:
By segmenting the tool into a receiver and threading section, the portion requiring clearance (the receiver and driver interface) is separated from the portion that enters the hole. This allows the tool to reach deep holes while minimizing the clearance space needed outside the hole, as only the receiver portion needs accommodation space.
4Power
If standard t-handle drivers are used with taps, then the taps can be driven effectively, but the taps cannot be used in deep blind holes due to driver size
Solution Approach 1:
The receiver serves as an intermediary that accepts drive sockets, which in turn connect to ratchet drivers. This intermediary interface allows the use of compact ratchet drivers instead of large t-handle drivers, maintaining effective power transmission while enabling access to deep blind holes where space is limited.
Data Source
AI summary
A tap and chaser are provided each having a cylindrical tool receiver connected to a threading section by a shaft. The receiver and shaft are of diameters sufficiently small to enter the bore hole and distribute any off axis load onto a number of internal threads of the bore hole to dissipate loading. The threaded section includes a group of longitudinal flutes. Each of the lands of the threaded section includes a novel cutting face, tooth angle and rake angle to advantageously allow for threading deep blind holes.