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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 grit-blasted 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
grit-based metallic material.
SURFACE ROUGHNESS:
Means the finely spaced surface irregularities produced by the
cutting action of the grit-blast media.
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.
LAY:
This is the term used to designate the direction of predominant
surface irregularities.
FLAWS:
These are the irregularities which may appear at infrequent
intervals. They are not typical of a grit-blast surface. |
The G-6 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 surfaces used in this scale are reproductions of accurately
grit-blasted surfaces measured in microinches (millionths of an inch
0.000001"). The numbers engraved alongside each surface are the average
deviation from the mean surface expressed in microinches.
The G-6 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 grit-blasted
surfaces is required. |
The G-6 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 product of the engineering skill and precision
workmanship of GAR Electroforming Division.
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FACTS & FEATURES... |
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The G-6 Grit-Blast MICROFINISH COMPARATOR is
rectangular in shape (1" x 5") and is a corrosion resistant
electroformed nickel duplicate of actual grit-blasted surfaces.
There are six replicated grit-blasted
surface finish specimens ranging from 32 to 1000 microinches.
The G-6 MICROFINISH COMPARATOR is
supplied in a leatherette case with engineering data and instructions.
The G-6 is also available in metric
with micrometer designations. |
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Technical Support |
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