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Swivel-Blade Deburring Tool: Roth, 1952
Cutting, punching, sawing and grinding leave burrs on the edges of metal, plastic and pressed wood. A knife or file scrapes them off unevenly, and only in skilled hands. Otto W. Roth of Los Angeles patented a swivel-blade cutting tool in 1952, US 2,598,443. A short hooked blade on a shaft turns freely in a sleeve in the handle, bent at less than a right angle. A rounded head at its tip rides on the face of the work and sets the blade's angle, so as the tool is drawn along an edge or round a punched hole the blade follows it and shaves the burr off evenly.
Intermediate
Workshop process
Instructions
1
1
Handle and sleeve
Handle and sleeve
Bore the handle axially and press in a sleeve or bushing; a pressed-in part of the sleeve bears on the shaft lightly so it does not slip out, and its outer end turns over against the handle's end.
Materials for this step:
Tool Handle with Axial Bore1 piece
Swivel Bearing Sleeve1 pieceTools needed:
Metal Lathe
Bench Vise2
2
Blade
Blade
Form the blade on the shaft's end at an angle of less than 90°, with a knife edge between two flat sides and a rounded head at the tip that overhangs the edge.
Materials for this step:
Hooked Deburring Blade on Shaft1 pieceTools needed:
Bench Grinder3
3
Swivel fit
Swivel fit
Put a collar on the shaft to bear against the sleeve's end, and insert the shaft so the blade rotates freely. (In the alternative form, a thrust bearing at the base of the bore and a flared bearing sleeve give a smoother swivel, and a cap closes the handle.)
Materials for this step:
Thrust Collar1 pieceMaterials
4- 1 piecePlaceholder
- 1 piecePlaceholder
- Placeholder
- 1 piecePlaceholder
Tools Required
3- Placeholder
- Placeholder
- Placeholder
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