Unlike rasps, which are characterized by individual teeth that can rough out shapes and
remove stock quickly, files are "cut" with parallel diagonal rows to form ridges. They
are better suited to jobs in which you require a more smooth, accurate finish. Files are
classified by their shape or profile - flat, round, half-round, square, triangular. The
shape often defines their use.
The hand file has a second set of parallel diagonal rows that cross the first, which means
it is "double cut". These overlapping ridges form a rougher surface than single-cut files.
The tool is therefore useful for jobs in which a smooth finish is not essential, but you
do not want the rough treatment of a rasp. Because it is flat, this file is most suitable
for trimming flat planes and shapes outside curves.
Another feature of the hand file is that one edge is uncut, or "safe". This means you can
file into corners without accidentally damaging them.
To reduce clogging, rub files with chalk. Use a soft wire brush or a special tool called
a file card to periodically remove accumulated debris from its ridges. Don't tap a file
against a hard or metal surface to clean it; you might damage the tool. Store your files
in slotted racks or protective sleeves to prevent them scraping against each other and
becoming damaged.
Purchasing
Hand files typically range in length from 4 to 12 inches. They come in three degrees of
coarseness - smooth cut, second cut, and bastard cut (the coarsest). Longer files,
regardless of the grade, leave a coarser surface than shorter files.
Substitutes
Alternatives to the hand file include a double-cut flat file and half-round file.
Caution
- Protect your hands from punctures by securing the tang - the pointed end of your file -
in a file handle before you use it. This also gives better leverage when using the tool.
- Always wear goggles or safety glasses when filing metal.
back to main
Brought to you by Book of Skills and Tools and New Complete Do-It-Yourself Manual
|
|
Del.icio.us
Digg
Reddit
Facebook
StumbleUpon
TwitThis
Advertisement 
