Reciprocating Saw Blade Tooth Geometry for Accurate Plunge Cutting
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Solution Overview
Problem
Existing reciprocating saw blades with plunge noses often create an enlarged, inaccurate kerf when plunged into a workpiece, leading to slow and uncontrolled cutting, which hampers efficiency and durability.
Innovation Solution
A reciprocating saw blade design featuring a full raker tooth with a relief face angle of 35° to 50° and an enlarged gullet, combined with a plunging end surface at 35° to 45°, allows for precise and fast plunge cutting by creating a larger gap for initial penetration and enhancing chip removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional plunge nose design is used, then the blade can plunge into the workpiece, but it creates an enlarged inaccurate kurf and provides little control
Solution Approach 1:
The first tooth at the plunging end is designed with different properties than the remaining teeth - specifically, it has a relief face angle of 35° to 50° and is positioned to create a precise initial kerf. This localized differentiation at the critical plunging point enables accurate entry while maintaining control, resolving the contradiction between plunge accuracy and operational control.
2Productivity
If the reciprocating saw blade cuts fast, then productivity increases, but blade life or durability may be reduced
Solution Approach 1:
The patent optimizes multiple parameters including the relief face angle (35° to 50°), gullet sizes (first gullet 1.5 to 5.5 times larger than others), and tooth configuration. These parameter changes enable faster chip removal and reduced cutting forces, allowing high-speed cutting while maintaining blade durability through reduced stress and heat generation.
3Productivity
If the first gullet is enlarged to 1.5 to 5.5 times the size of remaining gullets, then chip removal speed increases, but manufacturing complexity increases
Solution Approach 1:
The blade teeth are segmented into two functional groups: the first tooth at the plunging end with its enlarged adjacent gullet for rapid chip ejection, and the remaining uniform teeth for consistent cutting. This segmentation allows the enlarged gullet to be strategically positioned only where needed for initial plunge cutting performance, managing complexity through functional differentiation.
Data Source
AI summary
A method of manufacturing a reciprocating saw blade includes forming a body with a shank end configured to secure the blade with a reciprocating saw, a plunging end configured to enter a workpiece, and a cutting edge and opposite back edge extending between the shank end and the plunging end. The cutting edge is formed to include a plurality of teeth arranged in a repeating pattern that includes left set teeth and right set teeth, the plurality of additional teeth being substantially the same size as each other and as the third tooth, wherein the plurality of additional gullets are substantially the same size as each other, and wherein the enlarged first gullet is longer in an axial direction than each of the plurality of additional gullets.