Multi-Blade Self Feed Bit with Angled Cutting Edges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing self-feed bits for cutting large diameter holes in wood are not optimized for efficient cutting and safety, as they often lead to uneven cuts and increased operator risk due to concentrated cutting forces.
Innovation Solution
A drill bit design featuring a shank with a cutting head having multiple cutting blades oriented at different angles, which distribute cutting forces evenly and allow for efficient removal of wood chips, improving cutting efficiency and safety by allowing each blade to cut distinct segments of the hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cutting edge is used in self-feed bits, then the structure is simple, but the cutting forces are concentrated leading to uneven cuts and safety risks
Solution Approach 1:
The cutting head is divided into multiple cutting blades (typically three) spaced around the circumference, each blade having its own cutting edge. This segmentation distributes the cutting forces across multiple points rather than concentrating them at a single location, resulting in more uniform cutting action and reduced safety risks while maintaining operational simplicity
2Reliability
If multiple cutting blades are used to distribute cutting forces, then cutting uniformity and safety improve, but the device complexity increases
Solution Approach 1:
Multiple cutting blades are merged into a single integrated cutting head assembly that rotates as one unit with the bit shaft. The blades are positioned at different radial locations and angles, allowing them to work simultaneously on different segments of the hole circumference. This merging approach achieves force distribution and cutting uniformity without requiring multiple separate tools or complex coordination mechanisms
Data Source
AI summary
A shank that has one end adapted to be connected to a chuck of a rotary tool. The opposite end of the shank supports a cutting head having a series of teeth formed on the edge thereof for cutting the periphery of the hole. A screw tip may be provided for feeding the bit into and through the wood. A plurality of cutting blades are provided for boring the interior of the hole. The cutting blades define a plurality of cutting edges that are disposed at different angles to a plan perpendicular to the axis of rotation.