Rasps: Teeth Raised One at a Time with a Pointed Punch

A rasp is a coarse file whose teeth stand separately instead of in continuous rows. Each tooth is raised by driving a pointed punch into the face of the blank at uniform distances. Because the teeth stand apart, a rasp clogs less than a cut file on soft material such as wood or a horse's hoof. The blank is forged, annealed and ground like a file blank, and the finished rasp is hardened like a file: coated against scale, brought to a dull red heat and plunged into water, with the tang tempered so it will not snap. Machine-made rasps have uniformly stamped teeth, which line up row behind row and leave deeper marks; slightly uneven hand-cut teeth avoid this.

高级

2 days (annealing overnight)

说明

Forge the blank

Forge the steel to a tapered bar, flat, round or half-round, with a narrow pointed tang at one end.

此步骤所需材料：

高碳钢坯0.5 公斤

所需工具：

铁匠炉

铁砧

锻打锤

锻造钳

Anneal and grind

Anneal the blank soft so the teeth can be raised, then grind the faces to a smooth, clear surface.

所需工具：

铁匠炉

旋转磨石

Punch the teeth

Drive the pointed punch into the face with the hammer at uniform distances, raising one separate tooth at each blow. Turn the rasp over on a soft metal plate to work the other face without crushing the finished teeth.

所需工具：

木锉剁齿冲

锻打锤

铁砧

锡镴垫板

Harden

Coat the toothed surface thickly with a salt composition against scaling, raise the rasp to a dull red heat in a clear coke fire and plunge it upright into water. If it bends, straighten it across a fulcrum before it is fully cold.

此步骤所需材料：