Bottom Cutting Step Up Reamer for Centered Hole Repair
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Solution Overview
Problem
Existing hole repair tools, such as bottom cutters and three-step reamers, either oversize or fail to center damaged holes due to their design limitations, where bottom cutters create clean but oversized holes and reamers lack a forward cutting surface for path creation.
Innovation Solution
A bottom cutting step up reamer with a shaft and multiple step up lands having parallel cutting edges, allowing for centered hole repair without oversizing, by aligning the tool's centerline with the hole's center and using both bottom and parallel cutting edges to expand the hole to the desired diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-step reamer is used to repair damaged holes, then the hole size is controlled accurately, but the tool cannot create a new centered path
Solution Approach 1:
The patent merges the path-creation capability of a bottom cutter with the precise sizing capability of a reamer into one tool. The bottom cutter portion establishes a new centered path, while the integrated reamer portion with step-up lands controls the final hole diameter accurately
2Ease of manufacture
If traditional separate tools (bottom cutter and reamer) are used for hole repair, then each tool performs its specific function, but two separate operations are required
Solution Approach 1:
The patent combines two separate tools (bottom cutter and reamer) into a single multi-functional tool that performs both path creation and hole enlargement in one continuous operation, eliminating the need for tool changes and secondary operations, thereby improving productivity
Data Source
Figure 1
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Figure 3A~3C
AI summary
A bottom cutting step up reamer (40) incorporates a shaft (12) having a first end (44) with attachment features adapted to be received in a chuck. A plurality of bottom cutting edges (50) substantially perpendicular to the shaft (42) are located at a second end (48) distal from the first end (44). At least one step up land (52a, 52b) is provided proximate the plurality of bottom cutting edges (50) and spaced toward the first end (44) with a plurality of parallel cutting edges (54a, 54b) substantially parallel to the shaft (42).