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Rasps and files

    

 

 

Where it is necessary, to scrape roughly the wood's surface, before sanding with sandpaper, or to shape and  smooth rounded parts, concave or convex, smooth chipped and frayed corners, you can use the rasps, consisting of a steel bar, ending with a tang, on which engage the handle, in wood or plastic.

The abrasive surface is realized eroding the metal with the burin, with which is created a series of parallel cuts, that produce different aligned teeth, more or less protruding.

The profile of the section can be rectangular, (fig. 1a), half-round, that is semicircular in shape (fig. 1b) or round, also called rat-tail (Fig. 1c).

They come in various sizes and grits.

For a better finish, you can use the files (fig. 2).

The abrasive part is realized by a series of cross-cuts, which produce a surface similar to the skin of a fish, with a variable number of from six to one hundred and fifty per square centimeter.

From the amount of grits, we determine the fineness of files, which are therefore classified as: rough o coarse, middle, bastard, second cut, smooth

There are also files called "Dead smooth", of up to six hundred grits per square centimeter.

As with rasps, there are of various sizes and with different shapes: rectangular, half-round, round, triangular (three square), with a wedge section  (knife), diamond or double knife, oval or almond.

For particular works, there are shaped rasps and files, called riffler, suitable for small surfaces, which are held in the middle, in the smooth part. (Fig. 3 and 4).

To remove the sawdust and wood dust from the gaps, the teeth should be used a brush with metal bristles

 

 

 

fig. 1

 

 

fig. 3

 

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fig. 2

 

 

fig. 4

 

 

 

 

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