METAL BODY REPAIR - OD1653 - LESSON 1/TASK 1
(b) Place the file on the work.
With a straight stroke, push the
file away from you, holding it at an angle of 30 degrees in relation to its
line of travel. If the file digs in, you are putting too much pressure on
it.
At the end of the first stroke, raise the file and bring it back to
where you started and make a second stroke. Remember to raise the file at
the end of each stroke. It should not be pulled back over the metal because
dragging will tend to dull the file blade.
(c) By filing in the above manner, the file marks are parallel and
have removed all of the paint, and probably some of the metal, from the work
in the filed area. This type of filing is referred to as line filing. The
term "line filing" means all the strokes, and consequently, all of the file
marks, are in the same direction.
(d) Now change the direction of your file strokes so they are about a
45 degree angle from the previous direction.
This is referred to as X-
filing. When the file is moved so that you are X-filing, you may find that
the contour of the area differs slightly. If this is true, adjust the file
holder again to nearly, but not quite, match the contour. Then go over the
entire area once lightly. You will now find that the new file marks cross
the original file marks at a 45 degree angle and that these two sets of file
marks form a series of innumerable X's from which the term "X-filing" is
derived. X-filing or cross-filing is necessary to establish or maintain a
contour that curves in more than one direction; whereas, line filing is used
on more simple surfaces. When filing, it is always a good plan to make a
few cross or X-strokes occasionally to make sure that you are not destroying
a secondary contour in the metal.
This is particularly important when
filing areas that have been built up with solder or other material.
(3) When using body files on epoxy fillers, ensure that the fillers are
thoroughly cured or the file will clog and gouge the surface.
8.
Conclusion
Knowledge of the metal body repair procedures described in this subcourse
task should provide a strong basis for being able to perform repair on
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