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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 machined 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 machined metallic material.
SURFACE ROUGHNESS:
Means the finely spaced surface irregularities produced by
the cutting action of the tool edges, the feed of the machine tool and
by abrasive grains.
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 machined surface. |
The G-61 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
machined 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.
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FREE
Technical Support |
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The G-61 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 machined surfaces is required.
The G-61 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-61 Conventional Machining MICROFINISH
COMPARATOR is rectangular in shape (1 3/8" x 6") and is a nickel
corrosion resistant electroformed nickel duplicate of actual
machined surfaces.
There are twelve replicated machined
surface finish specimens with examples of four different machining
processes: shape-turn ,ground, profiled and milled- ranging from
250 to 2000 microinches.
The G-61 MICROFINISH COMPARATOR is
supplied in a leatherette case with engineering data and
instructions.
The G-61 is also available in metric
with micrometer designations. |
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Electroforming
