SCANMeasure Operation Manual 1.3 CD

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SCANMeasure

Operation Manual

Software Version 1.3

Date of Issue: September 30, 1999Manual Version 1.3

Part Number: 51CHM003D

MTICORPORATION


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COPYRIGHT AND LICENSE AGREEMENT

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Table of Contents i

TABLE OF CONTENTS

SCAN FUNCTION INTRODUCTION.................................................................1

ANALYZE .........................................................................................................2Edit (Base) Scan Data............................................................................................2Scan Data Info........................................................................................................8

GENERATE ......................................................................................................9Circular Curve........................................................................................................9Elliptical Curve.....................................................................................................11Surface from Curves.............................. ......................... ........................ ............. 12Surface by Extrusion............................. ......................... ........................ ............. 13Surface by Revolution........................... ......................... ......................... ............ 14

SET OPEN/CLOSED......................................................................................16

SEARCH FOR PEAKS ...................................................................................17

SMOOTH........................................................................................................18

MIRROR .........................................................................................................20

NUMBER OF POINTS ....................................................................................21

START POINT................................................................................................22

REVERSE.......................................................................................................23

JOIN CURVES................................................................................................24

PROBE COMPENSATE .................................................................................25

BEST FIT CURVE ..........................................................................................26

BEST FIT SURFACE......................................................................................28

LENGTH OF CURVE......................................................................................29

AREA OF CURVE...........................................................................................30

CENTROID OF CURVE..................................................................................31

WIDTH AND HEIGHT......................................................................................32

INTERPOLATE CURVE .................................................................................33

INTERPOLATE SURFACE.............................................................................35

OFFSET CURVE ............................................................................................37

OFFSET SURFACE........................................................................................38


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ii SCANMeasure 6000 Operation Manual


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SCANMeasure Operation Manual 1

Scan Function Introduction

This booklet discusses the functions and processes that can be performed on scan data within

SCANMeasure.

The scan data is:

1 A set of points that lie on a specific plane (a 2D curve) or in space (a 3D surface).

2 Special information such as the direction vector normal to a curve/surface, etc.

A surface can be considered as a series of curves, and conversely, a curve can be considered as

a section of a surface. The scan data may be collected by measurement, generated, or imported

from other sources such as a CAD system.

In ordinary applications, the scan data, collected by measuring a number of points on a surface,

are compared to nominal (design) surface data. The results can then be displayed, printed, orsent to a CAD system for reverse engineering. The scan functions in this chapter provide a set

of tools for curve/surface analysis.


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2 SCANMeasure Operation Manual

AnalyzeThe ANALYZE function allows the user to generate, edit and compare curves and surfaces. After

selecting ANALYZE from the SCAN menu two dialog boxes appear, EDIT SCAN DATA and SCAN DATA

INFO. The EDIT SCAN DATA window is the main window of the ANALYZE interface.

The sub-dialog, SCAN DATA INFO, consists of a list-box with base curve/surface information.

You can switch between the EDIT SCAN DATA and the SCAN DATA INFO windows. Use the mouse to

click on one of the dialogs or use the DATA WND and MAIN WND buttons, which will be explainedlater.

Edit (Base) Scan Data

Display Window

The display window is a graphical representation of the actual and nominal data that has been

loaded and, if it exists, the previous scan data. The base element, either actual or nominal, is

shown with solid lines, and the non-base element is shown with dotted lines. The actual

element is displayed in blue and the nominal element is displayed in green. The previouselement, if it exists, will be displayed in red dotted lines.

A box can be defined in the display window by performing a click-and-drag motion in the

display window, while holding the left mouse button down. After the box is completed, the

following sub-menu appears:


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Selecting the TO ZOOM IN option zooms the portion of the window inside the box to fill the

window, while maintaining the proper aspect ration. The TO SELECT POINTS function

selects/deselects all scan data points contained in the box on the base curve/surface. This

operation is equivalent to applying the MARK button operation to all points contained in the box.If the left mouse button is clicked on a single point in the base element, it is equivalent to

applying the MARK button operation on that point.

EditThe EDIT function allows you to directly make changes to the displayed scan. All edits affect thebase element, or the element that appears as a solid line. Select the raw data points and then

run an edit function on those points. These functions are identical to the ones available on the

main GEOMeasure window from the SCAN menu option. Please see their correspondingsections for details on its functionality.

How to construct a line from scan data:Step 1 Load a curve (file or label) by selecting the LOAD button.

Step 2 From the display window, select the raw data points that are to be used in

constructing the feature. You can select the points on the EDIT (BASE) SCAN DATA

display or highlight the points on the SCAN DATA INFO window. When selecting points,

keep in mind the minimum number of points that are required for constructing the

feature (i.e. a line requires two points, a circle requires three points, etc.).

Step 3 Select the CREATE PPG option to allow the part program code to be created for thefeature construction.

Step 4 Select EDIT | CONSTRUCT | FEATURE option. Only the features that can constructedfrom the selected points will be available.

Step 5 Select OK on the BASE SCAN DATA window and resultant part program will look similar

to the following:


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Calc

The CALC function allows you to calculate various curve information, such as peaks, length, andarea. Select the raw data points and then run a calculation function on those points.

These functions are identical to those available on the main GEOMeasure window from the

SCAN menu option. Please see their corresponding sections for details on its functionality.

Point Selection

The POINT SELECTION operations consist of NEXT, PREV, and MARK. The point on the base element(solid line) that has a large hollow rectangle around it is the current point. The current point is

used as the default value for the EDIT | INSERT POINT dialog. When the NEXT button is clicked, the

current point is moved to the next scan point along the curve/surface. When the PREV button isclicked, the current point is moved to the previous scan point along the curve/surface. When

the MARK button is clicked, the current point is toggled between selected and unselected. The

selected points are shown in a “highlight” color. The selected points are used as default values

for the EDIT | SMOOTH dialog and the EDIT | DELETE POINTS dialog. Also, in the SCAN DATA INFOwindow, the selected point’s information is highlighted.

Show Points

When the SHOW POINTS checkbox is checked the points on the loaded elements are displayed.

Display Element(s)

The DISPLAY ELEMENT(S) section consists of NOM, ACT and PREV checkboxes. When NOM is

checked, the nominal element is displayed if it has been loaded. When ACT is checked, the

actual element is displayed if it has been loaded. When PREV is checked, the previous element,

either actual or nominal, is displayed..

Scroll Bar Mode

The SCROLL BAR MODE options are TO ROT and TO PAN. When TO ROT is selected, the vertical scroll

bar along the side of the display window will rotate the display about a horizontal line centered

at the middle of the display window. The horizontal scroll bar along the bottom of the display

window will rotate the display about a vertical line centered at the middle of the display

window. When TO PAN is selected, the vertical scroll bar will offset the display vertically andthe horizontal scroll bar will offset the display horizontally.

Zoom

The ZOOM operations consist of IN, OUT, and FIT. The IN button zooms the display in by a factor

of 2, centered at the middle of the window. The OUT button zooms the display out by a factor of

2. Clicking the FIT button zooms and offsets the display so that all elements are as large aspossible and completely visible.

Create PPG

When the CREATE PPG checkbox is checked, subsequent EDIT and CALC operations will generate

the appropriate GeoDMIS commands and insert them into the current GEOMeasure PART

PROGRAM window. If this checkbox is not checkmarked, EDIT and CALC operations will notgenerate of GeoDMIS commands.


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Pref

Clicking the PREF button launches the DISPLAY PREFERENCES dialog box.

Changing the DISPLAY POINTS controls increases or decreases the resolution of the displayed

curves/surfaces. Clicking BACKGROUND COLOR opens the standard Windows COLOR dialog box.

Select a color and OK. The BACKGROUND COLOR field will change accordingly. Select OK to return

to the SCAN DATA window and the display window background will be the selected color.

PrintThe PRINT button launches the PRINT SETUP window allowing you to print the display window on

the default printer.

Switch Base

When an element is the base element the SCAN DATA INFO sub-dialog listbox and the EDIT SCAN

DATA window title are updated to reflect the change. The base element is indicated by the use of

solid lines. The SWITCH BASE function switches the base element from nominal to actual or vice

versa.

Data Wnd

When the DATA WND button is clicked, the SCAN DATA INFO sub-dialog becomes the active

window.

Unload

When is displayed scan is no longer needed, select UNLOAD to remove the scan from the dialogbox. If a scan type is not loaded, then its unload option will not be available. Selecting one of

the enabled menu items permanently removes that curve/surface from the display window.

Once a curve/surface is unloaded, it is no longer available for saving.


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Load

The LOAD FROM FILE option provides the ability to load a scan file into the display window and

attach a label to it. The LOAD FROM LABEL option allows you to display a scanned curve/surfacethat is already defined in GEOMeasure.

Loading a scan element changes the scan file name and its corresponding label to temporary

names. This allows you to edit the scan data while preserving the original data until the user

explicitly saves it by selecting SAVE. If an actual curve/surface is loaded, and an actual

curve/surface already exists, the previous actual data will become the PREVIOUS SCAN DATA for

viewing purposes. If a nominal curve/surface is loaded, and a nominal curve/surface already

exists, the previous nominal data will become the PREVIOUS SCAN DATA for viewing purposes.

When a scan element is loaded, it becomes the base element, and the SCAN DATA INFO sub-dialog

listbox, and the EDIT SCAN DATA window title, are updated to reflect the change.

Compare

The NOM /ACT CURVES COMPARISON dialog box displays the distances from the points on the actualelement to the nominal element or from the points on the nominal element to the actual

element, depending on which element is the base element.

The element color coding in this display window is the same as in the display window of the

main dialog - the actual element is shown in blue and the nominal element is shown in green.

The base element is displayed as a curve or surface, and the points on the non-base element are

shown with lines connecting the points to the closest place on the base element. If a point on

the non-base element is within the specified tolerances the line is shown in black. If a pointexceeds the specified upper tolerance the line is shown in red. If a point exceeds the lower

tolerance it is shown in pink.

Upper bound and lower bound curves/surfaces are shown based on the base element and the

user specified upper and lower tolerance values. They are shown as dotted curves/surfaces. The

listbox area of this dialog box displays the tolerance result information, which consists of the

non-base element points, the point information of the closest places on the base element, and

the distances between these points. The maximum distances (positive and negative) of the

points on the non-base element to the base element and at which points they occur are shown.


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ViewThis section of the dialog box has functions that affect how the comparison information

appears in the display area. The SHOW PTS option displays the points on the base elements. To

show the point numbers, select the NUM option. When the SHOW UPPER CURVE checkbox is

checked the upper bound curve/surface, based on the specified upper tolerance, is shown. When

the SHOW LOWER CURVE checkbox is checked the lower bound curve/surface, based on thespecified lower tolerance, is shown.

Base

The BASE section options are ACT and NOM. When ACT is selected, the actual element becomes

the base element. When NOM is selected, the nominal element becomes the base element.

Hash TolIf the base is NOM the HASH TOL option will find the intersection point with actual curve, along

its normal vector. An ACT base will find the intersection point with nominal curve along its

normal vector. If there are no intersection points, the closest point on the non-base curve will

be given.

Scroll Bar ModeThe SCROLL BAR MODE options are TO ROT and TO PAN. When TO ROT is selected, the vertical scroll

bar along the side of the display window will rotate the display about a horizontal line centeredat the middle of the display window. The horizontal scroll bar along the bottom of the display

window will rotate the display about a vertical line centered at the middle of the display

window. When TO PAN is selected, the vertical scroll bar will offset the display vertically andthe horizontal scroll bar will offset the display horizontally.

Zoom

The ZOOM operations consist of IN, OUT, and FIT. The IN button zooms the display in by a factor

of 2, centered at the middle of the window. The OUT button zooms the display out by a factor of

2. Clicking the FIT button zooms and offsets the display so that all elements are as large aspossible and completely visible.

Dev-Mag

The DEV-MAG area contains a text entry field for the magnification factor and the MAN button.The value entered in the text field is a magnification factor for the point deviations. Clicking

the MAN button updates the display window to reflect the new magnification factor. If the MAN

button is not clicked, the point-to-curve/surface distances in the display window may not reflect

the value contained in the text field.

Tolerance

The TOLERANCE area contains text entry fields for upper and lower tolerance values and the

APPLY TOL button. Upper and lower tolerance values can be entered in the text fields. Clicking

the APPLY TOL button refreshes the display area and the tolerance information in the list box with

the updated values. If the APPLY TOL button is not clicked, the upper and lower bound

curves/surfaces, and the tolerance result information in the listbox, may not reflect the values

contained in the text fields.

2DThe 2D option, when checked, projects the displayed scans to one plane. If unchecked, the

graphic will be displayed in three-dimensional space.

ClipBdTolerance result information in the listbox can be copied to the clipboard by clicking the CLIPBD

button.


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Print

The PRINT button launches the PRINT SETUP window allowing you to print the display window,such as tolerance result information, on the default printer.

Save

Clicking the SAVE button launches a sub-menu with the options SAVE ACTUAL and SAVE NOMINAL.

If actual scan data has been loaded the SAVE ACTUAL menu option will be enabled and can be

selected to save the actual data to the original data file. If nominal scan data has been loadedthe SAVE NOMINAL menu option will be enabled and can be selected to save the nominal data to

the original data file.

Scan Data Info

Main WndWhen the MAIN WND button is selected the EDIT SCAN DATA window becomes the active window.

HideClicking the HIDE button hides this dialog and the EDIT SCAN DATA window becomes the active

window. If you select the DATA WND button on the EDIT SCAN DATA window, this dialog will

reappear and become the active window.

List BoxClicking on a point value line in the list box makes that point the current point and selects it.

Any other points that were selected are deselected. If the shift key on the keyboard is held down

while clicking on a point, all points between the current point and the clicked on point are

selected, and all other points are deselected. Clicking on a point and then moving the mouse

across other points while holding the mouse button down will selected all points moved across,

deselecting all other points. If the control key on the keyboard is held down while using any of

these selection methods, previously selected points are not deselected.

Deselect AllDESELECT ALL deselects all points on the curve/surface.

Select AllSELECT ALL selects all points on the curve/surface.

PrintPRINT button prints the selected points to the default printer.

ClipboardCLIPBOARD button copies the selected points to the clipboard.


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GenerateThe functions available on the GENERATE menu create curves and/or surfaces. Curves can be

circles or ellipses. Generate surfaces by connecting curves, extrusion of a curve, or revolution of

a curve.

Circular CurveThis function constructs a circular curve.

NEW CURVELABEL

Name of the actual or nominal curve feature that is to be created.

FEATURE TYPE This option indicates whether the generated curve should be an actual or

nominal feature.

SCAN PLANE Signifies the curve is parallel to the scan plane as follows:

XY PLANE Curve points lie in a plane parallel to the XY-plane.

YZ PLANE Curve points lie in a plane parallel to the YZ-plane.

ZX PLANE Curve points lie in a plane parallel to the ZX-plane.

X, Y, AND Z The center-point of the circle.

RADIUS The radius of the circle.

NUMBER OFPOINTS

The number of points to be created on the curve.


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Diagram of Circular Curve

The following statement represents sample part program code generated by the above dialog

box:


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Elliptical CurveThis function constructs an elliptical curve.

NEW CURVELABEL

Name of the actual or nominal curve feature to be created.

FEATURE TYPE This option indicates whether the generated curve should be an actual or

nominal feature.

SCAN PLANE Signifies the curve is parallel to the scan plane as follows:

XY PLANE Curve points lie in a plane parallel to the XY-plane.

YZ PLANE Curve points lie in a plane parallel to the YZ-plane.

ZX PLANE Curve points lie in a plane parallel to the ZX-plane.

X, Y, AND Z The center-point of the ellipse.

A Radius of the axis parallel to the primary axis.

B Radius of the axis parallel to the secondary axis.

NUMBER OF

POINTS

The number of points to be created on the curve.

Diagram of Elliptical Curve

The following statement represents sample part program code generated by the above dialogbox:


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Surface from CurvesThis function constructs a surface by connecting two or more curves.

NEW GSURFLABEL

Name of the actual or nominal surface feature to be created.

FEATURE TYPE This option indicates whether the generated curve should be an actual ornominal feature.

NUMBER OFT PATCHES

The number of patches to create along the curves.

SELECT FROMCURVES

The existing curve features are shown in this box.

CREATE FROMCURVES

The curve features from which the surface is to be created.

ADD=> The highlighted curve is added to the box CREATE FROM CURVES.

ALL=> All curves are added to the box CREATE FROM CURVES.


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Surface by ExtrusionThis function constructs a surface by extruding a curve.

LABEL Name of the actual or nominal surface feature that is to be created. Select

ACTUAL or NOMINAL to indicate whether the generated curve should be an actual

or nominal feature.

EXTRUDE CURVE

FEATURE

An actual or nominal curve feature from which the surface is to be created.

NUMBER OFT PATCHES

The number of patches to create along the curve.

NUMBER OFS PATCHES

The number of patches to create along the direction of extrusion.

SPACE The distance between patches in the extrusion direction.

EXTRUDE INDIRECTION

The direction vector (I, J, K) in which the curve is to be extruded.

Diagram of Surface by Extrusion


box:


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Surface by RevolutionThis function constructs a surface by revolving a curve around a user-defined axis.

LABEL Name of the actual or nominal surface feature that is to be created. Select

ACTUAL or NOMINAL to indicate whether the generated curve should be an actual

or nominal feature.

EXTRUDE CURVEFEATURE

An actual or nominal curve feature from which the surface is to be created.

NUMBER OFT PATCHES

The number of patches to create along the curve.

NUMBER OFS PATCHES

The number of patches to create along the direction of revolution.

DH (DELTAHEIGHT)

As the curve is rotated to create the surface, each subsequent surface patch is

translated delta height along the axis of revolution.

ANGLE The angle through which the curve is to be revolved.

REVOLUTION

ABOUT AXIS

The axis around which the curve is to be revolved.

X,Y and Z Cartesian coordinates of a point on the axis.

I, J and K The direction vector of the axis.


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Diagram of Surface by Revolution


box:


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Set Open/ClosedThis function sets the open/closed property of a curve.

SELECT CURVEFEATURE

Name of the actual or nominal curve feature whose property is to be set.

Select ACTUAL or NOMINAL to indicate whether the curve is an actual or nominal

feature.

SET CURVE If CLOSED is selected, the spline is created between the last point on the curve

and the first point on the curve. If OPEN is selected, there is no spline

connecting the last and first points.

Diagram of Set Open/Close


box:


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Search For PeaksThis function detects peak points on a curve. A list of peaked points is reported.

A peak point is a point on a curve where undesirable characteristics are likely to appear, i.e. the

curve may not look smooth near the peak point. A peak is detected by comparing the vectors

between adjacent pairs of points. If the angle between two vectors is larger than a certain value,

a peak is reported.

A peak is also reported if two adjacent points are the same, as this is likely to produce a loop in

the curve.

SELECT CURVE

FEATURE

Name of the actual or nominal curve feature on which to detect peaks. Select

ACTUAL or NOMINAL to indicate whether the curve is an actual or nominalfeature.

PEAK ANGLE(Degrees)

The threshold angle where peaks are detected.

A peak may be produced due to mechanical error like machine accuracy, probe stem bending,

etc., especially, when a sharp corner is measured with comparatively larger probe radius or

when the start point and the end point overlap.

Diagram of Search for Peaks


box:


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SmoothThis function smoothes points on a curve.

SELECT CURVEFEATURE

Name of the actual or nominal curve feature that is to be smoothed. Select

ACTUAL or NOMINAL to indicate whether the curve is an actual or nominalfeature.

SMOOTH TYPE The type of smoothing to be performed.

MULTIPOINT

The specified points are to be smoothed to their average point.

LINE The specified points are to be smoothed to the best-fit line

through the points. If the best-fit line can not be calculated, the

curve is not changed.

CIRCULARARC

The specified points are to be smoothed to the best-fit circle

through the points. If the best-fit circle can not be calculated, the

curve is not changed.

CURVE The specified point(s) is to be smoothed to the hermite cubicspline curve fit through four adjacent points, two on each side of

the point(s) being smoothed.

This applies only to points not on the ends of the curve

[Pi = (-Pi-2 +4Pi-1 +4Pi+1 -Pi+2)/6]. If the curve is closed, the point

indices wrap around to smooth points on the ends of the curve. If

the curve is open, the first two and the last two points on the

curve are left unchanged.

FROM POINTNUMBER

The index of first point to be smoothed.

TO POINT

NUMBERThe index of last point to be smoothed.


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Diagram of Smoothing


box:


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MirrorThis function mirrors points on a curve across a user-defined plane, and creates a new

GCURVE feature.

CREATE CURVEFEATURE

Name of the actual or nominal curve feature to be created. Select ACTUAL or

NOMINAL to indicate whether the curve is an actual or nominal feature. If the

label for the CREATE CURVE FEATURE is the same as the MIRROR CURVE FEATURE

the old curve data file may be overwritten, however it is generally intended to

create a different curve data file.

MIRROR CURVEFEATURE

The actual or nominal curve feature which is to be mirrored.

MIRROR ABOUTPLANE

Specifies the mirror plane about which points on the curve are mirrored.

OTHER PLANE When OTHER is selected in MIRROR ABOUT PLANE, X, Y and Z are the coordinates

of a point on the mirror plane. The I, J and K are the components of the vectornormal to the mirror plane.

Diagram of Mirroring


box:


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Number Of PointsThis function sets the number of points, distributed approximately evenly, along the curve.

CREATE CURVEFEATURE

Name of the actual or nominal curve feature that is to have the specified

number of points. Select ACTUAL or NOMINAL to indicate whether the curve is an

actual or nominal feature.

NUMBER OFPOINTS

The number of points to place on the curve. Must be larger than 3.

Diagram of Number of Points



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Start PointThis function defines the first point on a curve.

SELECT CURVEFEATURE

Name of the actual or nominal curve feature that is to have the first point set.

Select ACTUAL or NOMINAL to indicate whether the curve is an actual or nominalfeature.

INDEX OFSTART POINT

The number of the point to make the first point on the curve. An error can

occur if the first point index is not a valid point index (negative, or larger

than the number of points on the curve).

For example, if the curve is generated by interpolation, the first point is the interpolation start

position (the numbers outside of the curve below). In this case, this function sets the first pointto the desired position (the numbers inside the curve below).

Diagram of Start Point


box:


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ReverseThis function reverses the order of the points on a curve.

SELECT CURVEFEATURE

The actual or nominal curve feature which is to be reversed.

When generating a surface from curves that do not have the same scanning direction, use the

reverse function to change the order of the points on one of the curves. In the following figure,

the scanning direction of curve 2 is aligned to curve 1 and 3.

Diagram of Reverse


box:


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Join CurvesThis function joins points on two curves to make a new single curve (to handle SCANMeasure

paste functionality). No assumptions are made regarding the compatibility of the curves, i.e.

that they are co-planar, overlap, etc. The first point on the second curve is joined to the end

point of the first curve. The curve characteristics (such as open/close contour, scan-plane, etc.)

of the first curve are used for the combined curve.

CREATE CURVEFEATURE

The name of the actual or nominal curve feature to be created. If the label for

the CREATE CURVE FEATURE is the same as one of curve features to be joined, the

old curve data file may be overwritten. Generally, a new curve data file iscreated.

JOIN CURVEFEATURE

The first actual or nominal curve feature which is to be joined.

AND CURVEFEATURE

The second actual or nominal curve feature which is to joined.

In the example below, you would want to reverse the order of the points on curve 2 prior to

using the join function.


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In the following diagram the order of the points have been arranged to setup the join function.

Diagram of Join


Probe CompensateThis function probe compensates points on a previously uncompensated curve. If it is already

compensated, nothing happens to the curve.

SELECT CURVEFEATURE

The actual or nominal curve feature which is to be compensated.

SET CURVE 2D must be selected in this version. This means that the points are

compensated perpendicular to the curve, as shown in the following diagram.


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When scanning a part, the probe radius used should be less than half the value of the smallest

curve radius on the feature. This ensures that a smoother curve is obtained after compensating

for the probe radius.

Diagrams of Probe Compensation


box:

Best Fit CurveThis function calculates the best fit of the actual curve to the nominal curve. The translations

and rotations necessary to minimize the sum of the squares of the distances between the points

on the actual curve and the nominal curve are reported.

SELECT CURVEFEATURE

The actual and nominal curve features which are to be best fit.

TRANSLATIONS Specifies the allowed translation directions.

XYZDIR Translate in X, Y and Z directions.XYDIR Translate in X and Y directions.

YZDIR Translate in Y and Z directions.

ZXDIR Translate in Z and X directions.

XDIR Translate in X direction.

YDIR Translate in Y direction.

ZDIR Translate in Z direction.

NONE No translation is allowed.


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ROTATIONS Specifies the allowed rotation axes.

XYZAXIS Rotate about X, Y and Z-axes.

XYAXIS Rotate about X and Y-axes.

XZAXIS Rotate about X and Z-axes.

YZAXIS Rotate about Y and Z-axes.

XAXIS Rotate about X-axis.

YAXIS Rotate about Y-axis.

ZAXIS Rotate about Z-axis.

NONE No rotation is allowed.

The nominal curve must contain a sufficient number of data points and be a smooth curve. The

actual and nominal curve must also be close in order to guarantee good results, otherwise

divergent results can be expected.

If open curves are being compared, ensure that the actual curve will fall completely within the

nominal curve.

Diagram of Nominal to Actual Relationship

Check both curves for irregularities prior to starting the best-fit calculation. Use the “Search for

Peaks” functions to ensure that curves are smooth and free of irregularities.

If the nominal curve is circular in shape, don’t use rotation about the axis normal to the plane

in which the circle lies.

Diagram of Best Fit Curve


box:

For the result, X, Y and Z are translations along their respective axes. A1, A2 and A3 are

rotations about the X, Y and Z axes respectively, and are applied in that order.

The following is sample output that might be generated by this command:

BESTFIT X=0.0100 Y=1.2000 Z=0.0000 A1=0.0001 A2=0.0001 A3=45.0000


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Best Fit SurfaceThis function calculates the best fit of the actual surface to the nominal surface. The

translations and rotations necessary to minimize the sum of the squares of the distances

between the points on the actual surface and the nominal surface are reported.

SELECT CURVE

FEATUREThe actual and nominal surface features which are to be best fit.

TRANSLATIONS Specifies the allowed translation directions.

XYZDIR Translate in X, Y and Z directions.

XYDIR Translate in X and Y directions.

YZDIR Translate in Y and Z directions.

ZXDIR Translate in X and Z directions.

XDIR Translate in X direction.

YDIR Translate in Y direction.

ZDIR Translate in Z direction.

NONE No translation is allowed.

ROTATIONS Specifies the allowed rotation axes.XYZAXIS Rotate about X, Y and Z-axes.

XYAXIS Rotate about X and Y-axes.

XZAXIS Rotate about X and Z-axes.

YZAXIS Rotate about Y and Z-axes.




NONE No rotation is allowed.


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Diagram of Best Fit Surface


box:

For the result, X, Y and Z are translations along their respective axes. A1, A2 and A3 are

rotations about the X, Y and Z axes respectively, and are applied in that order.

The following is sample output that might be generated by this command:

BESTFIT X=0.0100 Y=1.2000 Z=0.0000 A1=0.0001 A2=0.0001 A3=45.0000

Length Of CurveThis function calculates the length of a curve. The length of the curve is reported.

SELECT CURVEFEATURE

The actual or nominal curve feature whose length is to be calculated.

Diagram of Length


box:


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Area Of CurveThis function calculates the area of a closed curve. If a curve is an open curve, an error

message is displayed, otherwise the area of the curve is reported. From the dropdown listbox

select the actual or nominal curve feature whose area is to be calculated.

Diagram of Area


box:


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Centroid Of CurveThis function calculates the centroid of the points on a curve. A point feature is created at this

point.

CREATE CURVEFEATURE

The name of the actual point feature which will be created, lying at the

centroid of the curve.

SELECT CURVEFEATURE

The actual or nominal curve feature whose centroid is to be calculated.

Diagram of Centroid


box:


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Width And HeightThis function calculates the width and height of a curve. At each of 512 equally spaced angles

from 0 to 180 degrees, the two parallel lines within the scan-plane of greatest distance that

touch the curve, and the two parallel lines of minimum distance that contain the curve, are

calculated. The largest of these values is the width, the smallest is the height. The width and

height are reported in the OUTPUT window. From the dropdown listbox select the actual ornominal curve feature whose width and height are to be calculated.

Diagram of Width and Height


box:


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Interpolate CurveThis function calculates interpolation points on a curve and constructs a new curve from the

points.

CREATE CURVE

FEATURE

The name of the actual or nominal curve feature to construct from the

interpolated points. If the label for the CREATE CURVE FEATURE is the same asthe INTERPOLATE CURVE FEATURE the old curve data file may be overwritten.Generally, this function is used to create a new curve data file.

INTERPOLATEDCURVE FEATURE

The actual or nominal curve feature to be interpolated.

INTERPOLATIONTYPE

The component for which interpolation is desired.

XAXIS Interpolation value is for the X-axis in Cartesian coordinates.

YAXIS Interpolation value is for the Y-axis in Cartesian coordinates.

ZAXIS Interpolation value is for the Z-axis in Cartesian coordinates.

RADIUS Interpolation value is for the radius in polar coordinates.

ANGLE Interpolation value is for the angle in polar coordinates.

ARCLENGTH

Interpolation value is for the length along the curve.

STARTING VALUE The value from which interpolation calculation is started. If the INTERPOLATION

TYPE is ANGLE this value should be an angle, otherwise it is a raw data point

number.

INCREMENT The interpolation increment value. If the INTERPOLATION TYPE is ANGLE thisvalue should be an angle size, otherwise it is a distance value.


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Diagram of Interpolation along X-axis

Diagrams of Interpolation with angle


box:


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Interpolate SurfaceThis function calculates interpolation points on a surface and constructs a curve on the surface

from the points.

CREATE CURVEFEATURE

The name of the actual or nominal curve feature to construct from the

interpolated surface. If the label for the CREATE CURVE FEATURE is the same as

the INTERPOLATE SURFACE FEATURE, the old surface data file may be overwritten.

Generally, this function is used to create a new curve data file.

INTERPOLATEDSURFACEFEATURE

The actual or nominal surface feature to be interpolated.

INTERPOLATIONFIXED AXIS

The first interpolation value. This value is fixed.

XAXIS Interpolation value is for the X-axis in Cartesian coordinates.YAXIS Interpolation value is for the Y-axis in Cartesian coordinates.

ZAXIS Interpolation value is for the Z-axis in Cartesian coordinates.

INTERPOLATIONVARIABLE AXIS

The second interpolate value. This value is incremented.

XAXIS Interpolation value is for the X-axis in Cartesian coordinates.

YAXIS Interpolation value is for the Y-axis in Cartesian coordinates.

ZAXIS Interpolation value is for the -axis in Cartesian coordinates.

STARTING FIXEDVALUE

The value is for INTERPOLATION FIXED AXIS.

STARTINGVARIABLE VALUEThe value from which interpolation calculation is started.

INCREMENT The interpolation increment value for INTERPOLATION VARIABLE VALUE.


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Diagram of Interpolate Surface


box:


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Offset CurveThis function offsets curve data in a selected direction by a specified amount.

CREATE CURVEFEATURE

The name of the actual or nominal curve feature to construct from the offset

curve. If the label for the CREATE CURVE FEATURE is the same as the OFFSET

CURVE

FEATURE

, the old curve data file may be overwritten. Generally, thisfunction is used to create a new curve data file.

OFFSET CURVEFEATURE

The actual or nominal curve feature to which the offset is to be applied.

OFFSET TYPE The offset direction.

XDIR Offset along the X-axis.

YDIR Offset along the Y-axis.

ZDIR Offset along the Z-axis.



ZAXIS Rotate about Z-axis.NORMAL Offset normal to the curve.

OFFSET VALUE The value to offset the curve.

Diagram of Offset Curve

The offset value should not exceed the curvature radius at a convex or concave portion on a

curve.


box:


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Offset SurfaceThis function allows surface data to be offset in a selected direction. If the label for the SURFACE

FEATURE is the same as the OFFSET SURFACE FEATURE, the old surface data file may be overwritten.Generally, this function is used to create a new surface data file.

CREATE

CURVE

FEATURE The name of the actual or nominal surface feature to construct from theoffset surface.

OFFSET SURFACEFEATURE

The actual or nominal surface feature to which the offset is to be applied.

OFFSET TYPE The offset direction.

XDIR Offset along the X-axis.

YDIR Offset along the Y-axis.

ZDIR Offset along the Z-axis.




NORMAL Offset normal to the surface.

OFFSET VALUE The value to offset the surface.

Diagram of Offset Surface along X-axis


box:


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READER’S COMMENTS

MTI CTLab is committed to providing our client’s with useful and accurate documentation.

Your comments regarding the information presented in this manual will be given every

consideration for incorporation into future revisions. We would also appreciate any comments

or suggestions regarding the software. Thank you for your consideration.

Mail or fax this page along with your comments to:

MTI Corporation - CTLab16839 E. Gale Avenue

City of Industry, CA 91745

USA

Fax (626) 855-0281

Name:

Company:

Address:

Telephone Number: Fax Number:

List any omissions or errors found in the manual or in the software. Refer to the page

number of the problem. Attach copies of particular pages if possible. In the case of software

errors, please provide as much specific detail as possible.


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