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Notes:
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Rough Shaping: The blank is punched to shape or is heated and
forged with drop hammers and rollers to shape the tang and
point.
Annealing: The forged blank is heated to an elevated temperature
and then cooled slowly under controlled conditions to soften
the steel for tooth cutting and to make internal steel structure
uniform.
Final Shaping: The annealed blanks are ground or milled to
produce a surface necessary for the uniform formation of the
teeth. This is followed by drawfiling that produces the perfectly
true flat or curved surface necessary for the uniform formation
of the teeth.
Forming Teeth: The teeth are formed
by a rapidly reciprocating chisel
that strikes successive blows on the
blank. The hardened chisel cuts into
the soft blank, displacing and raising
the steel into the desired tooth
structure.
Hardening: The file is then hardened
by heating it in a molten bath to a predetermined temperature.
This is followed by immersing the file in a quenching solution.
This combination of heating and cooling under carefully controlled
conditions brings the file to the maximum hardness to the very top
of the cutting edges.
Finishing: The file is cleaned and sharpened by bead blasting.
The tang is reheated to give strength without brittleness. It is
then given a series of tests by trained inspectors, and is oiled
to prevent rust.
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