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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
shot-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
shot-blasted metallic material.
SURFACE ROUGHNESS:
Means the finely spaced surface irregularities produced by the
cutting action of the shot-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 of these
readings. 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 shot-blast surface. |
The SH-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 shot-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 SH-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 shot-blasted surfaces is required.
The SH-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 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 SH-6 Shot-Blast MICROFINISH COMPARATOR is
rectangular in shape (1"x 5") and is a corrosion resistant
electroformed nickel duplicate of actual shot-blasted surfaces.
There are six replicated shot-blasted
surface finish specimens ranging from 32 to 1000 microinches.
The SH-6 Microfinish COMPARATOR is
supplied in a leatherette case with engineering data and instructions.
The SH-6 is also available in metric
with micrometer designations. |
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