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 SIMPLE
TO USE
Place the MICROFINISH COMPARATOR Surface Roughness
Scale alongside your work piece. Slide the scale so that the rectangle
with the surface roughness you want is adjacent to the piece you are
examining. Compare by drawing the tip of the fingernail across each
surface at right angles to the tool mark. The feel of the fingernail
contact must be the same if the finishes are identical.
TERMINOLOGY
TYPE:
The specimens are electroformed replicas
of original cast surfaces.
MATERIAL:
This MICROFINISH COMPARATOR Surface
Roughness Scale is made of nickel. It will not corrode.
APPEARANCE:
Each specimen has the surface roughness characteristics of a
cast metallic material.
It is recognized that the RMS roughness designation
which specifies the required finish of a part in micro-inch (millionths of
an inch) and is the average amount by which the finish may vary from the
nominal surfaces is not a satisfactory method of specifying cast finishes.
The RMS designation reflects the tool marks which are more or
less constant across a surface while the casting reflects one or more of
the following:
A. The grain size
of the cooling metal surface.
B. The sand grain size of
the mold.
C. The grain size of the
ceramic wash on the steel mold.
D. The grain size of the
ceramic investment mold. |
UNIFORMITY AND ACCURACY
The original masters and the electroformed replica production
masters have been checked at evenly distributed intervals. Sufficient
measurements were taken to determine a representative average. The rating
listed is the average of these readings.
The C-9 Cast MICROFINISH COMPARATOR Surface
Roughness Scale is made by a dual electroforming process wherein nickel is
electrodeposited to provide an exact reproduction in intricate detail.
The same electroforming process used to produce the Surface
Roughness Scale is available from GAR Electroforming to serve your product
needs.
The C-9 Cast MICROFINISH COMPARATOR Surface Roughness Scale
provides industry with established flat surface roughness specimens for
visual and tactual comparison. It is used in specifying and controlling
surface roughness when a product having the appearance of typically cast
surfaces is required.
The C-9 Cast MICROFINISH COMPARATOR Surface Roughness Scale
provides an economical tool which permits roughness to be specified on the
same basis as linear measurements. The surfaces presented are the result
of years of research and engineering. Details covering this subject are
now published in The American National Standards Institute (ANSI)
specification titled: "Surface Texture, Surface Roughness, Waviness
and Lay." ANSI/ASME B46.1 |
This
MICROFINISH COMPARATOR
Surface Roughness Scale is a patented item and is a product of the
engineering skill and precision workmanship of GAR Electroforming
Division.
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FACTS & FEATURES... |
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The C-9 Cast MICROFINISH COMPARATOR is
rectangular in shape (4 1/2"x 3 1/4") and is a corrosion resistant
electroformed nickel duplicate of actual cast surfaces.
There are nine replicated cast surface
finish specimens ranging from 20 to 900 microinches.
The C-9 MICROFINISH COMPARATOR is
supplied in a leatherette case with engineering data and instructions.
The C-9 is also available in metric
with micrometer designations. |
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Technical Support |
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