Unlike files, which are characterized by diagonal "cuts" in the surface that form ridges,
rasps have individually shaped teeth that can remove material more quickly and roughly.
They are used to rough out shapes in wood, soft metal or leather. Rasps are classified
by their shape or profile - for example, flat or half-round. The shape often defines
their use.
There are several different types of rasps, but the cabinet rasp is perhaps the most
widely used.
Using a Cabinet Rasp
Use the cabinet rasp on the push stroke, matching the pressure of the stroke to the
hardness of the material being worked - light for wood, heavier for metal. Lift the rasp
at the end of each stroke.
Use a special brush called a file card to clean rasp teeth often. Store rasps in slotted
racks or protective sleeves to avoid damaging the teeth.
Never use a rasp on a metal harder than its own.
Purchasing
Cabinet rasps are available in two grades of coarseness - smooth cut and second cut
(medium-coarse) - and in lengths ranging from 8 to 12 inches. Shorter rasps have smaller
teeth, and so leave a smoother surface than longer rasps. The half-round style is the
most versatile, because it allows you to work on flat planes and shapes outside curves
(flat side), as well as inside curves and concave surfaces (half-round side).
Caution
- Protect your hands from punctures by securing the tang - the pointed end of your rasp-
in a file handle before you use it. This also gives better leverage when using the tool.
- Always wear goggles or safety glasses when using a rasp on metal.
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