Understanding Flatness, Parallelism, & Profile in Calypso · deviation due to the angle of the...
Transcript of Understanding Flatness, Parallelism, & Profile in Calypso · deviation due to the angle of the...
Understanding
Flatness, Parallelism, & Profile
in Calypso
Last Updated: 9/12/2014 Understanding Flatness, Parallelism, & Profile in Calypso 1
• When you report form characteristics, like Flatness, in
Calypso, the result is determined by the distance
between two perfect pieces of geometry, “squeezed” as close together as possible containing the actual
measured points of the feature.
• This is calculated by default using a special Evaluation
Method, called “Minimum Element”.
• Note that this result for Flatness (form) is different than
the FORM listed in the feature’s window of Calypso, as that is typically calculated using the LSQ Evaluation
Method.
Flatness
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• When reporting Parallelism of one plane to another in
Calypso, the result can be thought of as the distance
between two planes, parallel to the datum, that contains
all of the actual measured points of the feature being
evaluated.
• By default, the LSQ evaluation method is used to
determine the orientation of the Datum.
• Note that in the Parallelism Characteristic, secondary
datums are not necessary if you are evaluating two 3-
dimensional features, like planes.
Parallelism
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• When you report “Profile” of a 3-D geometric feature in Calypso, the default result can be though of as the
thickness of a zone, centered on the nominal geometry of
the feature being reported, that contains all of the
measuring points of the feature.
• By its nature, “Profile” is a combination of size, form, orientation, and position errors.
• Calypso uses your Feature Nominals to determine the
“target” shape and location of the feature.
• *When reporting Profile, MAKE SURE ALL YOUR
FEATURE NOMINALS ARE CORRECT, including A1 and
A2 projection angles.
Profile
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Example Print:
A
B
10.00
3.0 A
1.0
2.0 B
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A
B
10.00
3.0 A
1.0
2.0 B Surface to
Evaluate
Assume Datum B is
perfectly Flat,
located exactly at
10.00
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• The next several slides show the results for Flatness,
Parallelism, and Profile for five different point patterns on
the surface to be evaluated.
• Notice how position, orientation, and form errors in the
points that make up the evaluated surface affect the
results of Flatness, Parallelism, and Profile.
• Actual characteristic windows from Calypso are shown,
along with explanations of why each result is calculated
the way it is.
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Flatness = 0
11.0
9.0
Actual Probing
Points
10.0
Flatness
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11.0
9.0
Actual Probing
Points Why The Answer?
• For a plane, if all points
lay on a perfectly flat
plane, regardless of
orientation or position,
the result will be zero.
• A perfect form result is
zero.
Distance of
Flatness Result
10.0
Flatness
Flatness = 0Last Updated: 9/12/2014 Understanding Flatness, Parallelism, & Profile in Calypso 9
11.0
9.0
Actual Probing
Points
Parallelism = 010.0
Parallelism
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11.0
9.0
Actual Probing
Points Why The Answer?
• If all the points lay in a
perfectly flat plane,
perfectly oriented to
match the datum, the
result will be zero.
Distance of
Parallelism
10.0
Parallelism
Parallelism = 0Last Updated: 9/12/2014 Understanding Flatness, Parallelism, & Profile in Calypso 11
11.0
9.0
Actual Probing
Points
Profile = 0
10.0
Profile
10.00
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10.00
11.0
9.0
Actual Probing
Points Why The Answer?
• Since Profile is the the
thickness of a zone
centered on the
nominal geometry, if all
measured points are
exactly on the nominal,
the thickness of the
zone would be zero.
• A perfect Profile result
is zero.
Thickness of
Profile Zone
10.0
Profile
Profile = 0
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11.0
9.0
Actual Probing
Points
Flatness = 0
10.0
Flatness
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11.0
9.0
Why The Answer?
• For a plane, if all points
lay on a perfectly flat
plane, regardless of
orientation or position,
the result will be zero.
• A perfect form result is
zero.
Distance of
Flatness Result
10.0
Flatness
Flatness = 0
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11.0
9.0
Actual Probing
Points
Parallelism = 1
10.0
Parallelism
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11.0
9.0
Why The Answer?
• In this case, a perfectly
flat plane shows
Parallelism deviation
due to the angle of the
plane relative to the
Datum.
• The result is the
distance between two
planes, parallel to the
datum, that contains all
the measured points.
Distance of
Parallelism
10.0
Parallelism
Parallelism = 1
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10.00
11.0
9.0
Actual Probing
Points
Profile = 2
10.0
Profile
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11.0
9.0
Why The Answer?
• Since Profile is the the
thickness of a zone
centered on the nominal
geometry, the result will
be two times the distance
of the most distant point
from the nominal
geometry.
Thickness of
Profile Zone
10.00
10.0
Profile
Profile = 2
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11.0
9.0
Actual Probing
Points
Flatness = 2
10.0
Flatness
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11.0
9.0
Distance of
Flatness Result
10.0
Flatness Why The Answer?
• In this case, the distance
between two perfect
planes parallel to each
other that contain the
measured points is 2.0.
Flatness = 2
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11.0
9.0
Actual Probing
Points
Parallelism = 2
10.0
Parallelism
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11.0
9.0
Distance of
Parallelism
10.0
Parallelism Why The Answer?
• In this case, a plane which
is perfectly parallel to the
datum (using LSQ fitting)
shows a high amount of
parallelism deviation. This
is because of the form error
of the feature.
• The result is the distance
between two planes,
parallel to the datum, that
contains all the measured
points.Parallelism = 2
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10.00
11.0
9.0
Actual Probing
Points
Profile = 2
10.0
Profile
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11.0
9.0
Why The Answer?
• Since Profile is the the
thickness of a zone
centered on the nominal
geometry, the result will be
two times the distance of
the most distant point from
the nominal geometry.
Thickness of
Profile Zone
10.00
10.0
Profile
Profile = 2
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11.0
9.0
Actual Probing
Points
Flatness = 0
10.0
Flatness
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11.0
9.0
Why The Answer?
• For a plane, if all points
lay on a perfectly flat
plane, regardless of
orientation or position,
the result will be zero.
• A perfect form result is
zero.
Distance of
Flatness Result
10.0
Flatness
Flatness = 0
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11.0
9.0
Actual Probing
Points
Parallelism = 0
10.0
Parallelism
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11.0
9.0
Distance of
Parallelism
10.0
Parallelism
Parallelism = 0
Why The Answer?
• If all the points lay in a
perfectly flat plane,
perfectly oriented to match
the datum, the result will be
zero.
• Note that position error
does not effect the
Parallelism result.
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10.00
11.0
9.0
Actual Probing
Points
Profile = 2
10.0
Profile
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11.0
9.0
Why The Answer?
• Since Profile is the the
thickness of a zone
centered on the nominal
geometry, the result will be
two times the distance of
the most distant point from
the nominal geometry.
Thickness of
Profile Zone
10.00
10.0
Profile
Profile = 2
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11.0
9.0
Actual Probing
Points
Flatness = 010.0
Flatness
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11.0
9.0
Why The Answer?
• For a plane, if all points
lay on a perfectly flat
plane, regardless of
orientation or position,
the result will be zero.
• A perfect form result is
zero.
Distance of
Flatness Result
10.0
Flatness
Flatness = 0
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11.0
9.0
Actual Probing
Points
Parallelism = 210.0
Parallelism
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11.0
9.0
Distance of
Parallelism
10.0
Parallelism
Parallelism = 2
Why The Answer?
• In this case, a perfectly flat
plane shows Parallelism
deviation due to the angle of
the plane relative to the
Datum.
• The result is the distance
between two planes, parallel
to the datum, that contains all
the measured points.
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10.00
11.0
9.0
Actual Probing
Points
Profile = 2
10.0
Profile
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11.0
9.0
Why The Answer?
• Since Profile is the the
thickness of a zone
centered on the nominal
geometry, the result will be
two times the distance of
the most distant point from
the nominal geometry.
Thickness of
Profile Zone
10.00
10.0
Profile
Profile = 2
Last Updated: 9/12/2014 Understanding Flatness, Parallelism, & Profile in Calypso 37