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Plate Shears: Bench Shears Made from a Flat File (Shop Notes, 1919)
Bench shears for sheet metal too heavy for hand snips: a 14 in flat file, ground and sharpened, works as a lever knife bolted against a fixed cutter forged from scrap steel and fastened to the bench.
Source: Popular Mechanics Shop Notes for 1919, p. 3271. Unknown: cutter and bolt sizes. Picture: the book's photo and drawing.
Intermediate
Unknown
Instructions
1
1
Make the moving knife
Make the moving knife
Take a 14 in flat file. Grind one side smooth and sharpen part of the tip and one edge. Heat it cherry red and punch the bolt hole.
Materials for this step:
Metal File1 14 in flat fileTools needed:
Bench Grinder
Forge
Tongs
Hot Punch
Hammer2
2
Forge the fixed cutter
Forge the fixed cutter
Forge the fixed cutter from part of an old plowshare or other suitable scrap steel, bent as in the drawing so it can be screwed to the bench, with a hole for the pivot bolt.
Materials for this step:
Carbon Steel Bar (0.6% C)1 scrap steelTools needed:
ForgeTongsHammerHot Punch3
3
Assemble on the bench
Assemble on the bench
Screw the fixed cutter to the bench and bolt the file knife to it. Use a locknut on the bolt, or rivet the end over.
Materials for this step:
Hex Bolt - Grade 8.81 piece
Hex Nut2 nut and locknut
Wood Screws1 pieceTools needed:
Adjustable Spanner
Screwdriver - FlatMaterials
5- 1 14 in flat filePlaceholder
- 1 scrap steelPlaceholder
- 1 piecePlaceholder
- 2 nut and locknutPlaceholder
- 1 piecePlaceholder
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