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Ill.
STYLUS EVALUATION
Once the stylus tip is in focus, wear spots should be visible which corre-
spond to the points of contact of the record surface. At
120x magnification, the
wear spots and the stylus tip are both in focus, resulting in so-called
"cat's
eyes" where wear has occurred. Figures 1 through
4
illustrate the following stylus
conditions at this magnification:
Figure
1A.
Figure 16.
Figure 2A.
Figure
26.
Figure 3A.
Figure
36.
Figure 4A.
Figure
48.
Good spherical stylus
Worn spherical stylus
Good elliptical stylus
Worn elliptical stylus
Good hyperbolic stylus
Worn hyperbolic stylus
Good hyperelliptical stylus
Worn hyperelliptical stylus
IMPORTANT:
New and used styli appear similar when casually observed.
Study the wear areas of new and used
styli in the microscope and compare
them with Figures 1 through
4.
Note that the figures show the entire stylus tips
in three-dimensional views. In the microscope, only a small portion of the tip
-the tip wear area- is in focus at one time. The wear area appears as a
flat, two-dimensional representation (as in Figures 5 through 8). This is due to
the depth of field limitation and illumination of the microscope.
Increase the eyepiece zoom control to 20
(200x magnification) and refocus
as necessary. Figures 5 through 8 illustrate the following stylus conditions at
this magnification:
Figure 5A.
Figure 5B.
Figure 5C.
Figure 6A.
Figure 6B.
Figure 6C.
Figure 7A.
Figure 7B.
Figure 7C.
Figure 8A.
Figure
8B.
Figure 8C.
Good spherical stylus
Slightly worn spherical stylus (recheck within 100 hours of
operation)
Badly worn spherical stylus (DO NOT USE
-
will damage
records)
Good elliptical stylus
Slightly worn elliptical stylus (recheck within
100 hours of
operation)
Badly worn elliptical stylus (DO NOT USE
-
will damage
records)
Good hyperbolic stylus
Slightly worn hyperbolic stylus (recheck within
100 hours of
operation)
Badly worn hyperbolic stylus (DO NOT USE
-
will damage
records)
Good hyperelliptical stylus
Slightly worn hyperelliptical stylus (recheck within
100
hours of operation)
Badly worn hyperelliptical stylus (DO NOT USE
-
will dam-
age records)