USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
when not in use.
This type of scriber usually has a 1/4 or 3/8 inch
diameter handle with a point length of 2 3/8 or 2 7/8 inches. Bent point
scribers are usually 8 to 12 inches long with one straight point, and one
long or one short bent point. Some of these scribers are threaded and can
be engaged in either end of the handle. The long bent point is designed for
reaching through holes beyond a lip or ridge.
Portions of these scribers
are knurled for firm grip.
(2) Tungsten Carbide Scribers. Tungsten carbide scribers are used to
lay out lines on very hard materials, such as hardened steel and glass. The
scriber point is made of tungsten carbide, a long wearing material, which
makes it possible to scribe sharp, well defined lines on the hardest
materials.
Some of these scribers are used, with an extension, in
conjunction with a Vernier height gage, which allows measurements to be
taken from the top to the bottom side of the gage jaws. This type scriber
is hardened, ground, and lapped to a point so that a line or series of lines
may be accurately drawn and spaced as required in laying out dies, and other
high precision work.
c. Using the Scribers.
(1) Make sure the point of the scriber is sharp. To sharpen, rotate
the scriber between thumb and forefinger while moving the point back and
forth on an oilstone.
(2) Clean work surfaces of all dirt and oil.
(3) Place a steel rule or straightedge on the work beside the line to
be scribed.
(4) Use the fingertips of one hand to hold the rule in position and
hold the scriber in the other hand as you would a pencil (figure 162 on the
following page).
(5) Scribe the line by drawing the scriber along the edge of the
rule, at a 45 angle and tipped outward and slightly in the direction in
which it is being moved.
d. Care of Scribers.
Place a cork or soft wood over the point of a
scriber when not in use.
Coat the scriber with rust preventive compound
before storing. Do not throw scribers in a drawer with
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