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Hacksaw: Bent and Flattened Frame, Bi-Metal Blade
A hacksaw is a C-shaped frame holding a narrow blade under tension from a screw. In a 1936 patented frame, each upright is made from a piece of wire rod, bent to shape and then pressed, rolled or hammered flat, with its end flattened at right angles to carry the blade, and the uprights are held in a channel-section top member. Bi-metal blades, patented in 1976, start as a metal block with a central strip of cutting tool steel; it is rolled flat into a sheet, the sheet is divided into two blades whose edges are the tool steel, the teeth are cut in that edge, and the blades are hardened by heating, quenching and tempering. The teeth are given a wavy set.
Advanced
Factory process
Instructions
1
1
Bend and flatten the uprights
Bend and flatten the uprights
Bend a piece of wire rod to the upright's shape, then press, roll or hammer its horizontal part and most of its upright part flat; flatten the end at right angles to take the blade.
Materials for this step:
Steel Wire Rod Coil1 as requiredTools needed:
Drop Hammer with Forging Dies2
2
Assemble the frame
Assemble the frame
Fit the uprights into the channel-section top member and fit the tensioning screw.
Materials for this step:
Channel-Section Steel Strip1 piece
Wing-Nut Tensioning Screw1 piece3
3
Make the blade stock
Make the blade stock
Roll a block with a central strip of tool steel flat into a sheet, and divide it into two blades with the tool steel along one edge.
Materials for this step:
High-Speed Steel Round Bar1 as required
Carbon Steel Strip1 as requiredTools needed:
Rolling Mill4
4
Cut and harden the teeth
Cut and harden the teeth
Cut the teeth in the tool-steel edge, set them in a wave, and harden the blades by heating, quenching and tempering.
Tools needed:
Saw Tooth Cutting Machine
Strip Hardening and Tempering FurnaceMaterials
5- 1 as requiredPlaceholder
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Tools Required
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