•(x) (y) : if each data-point is an X and Ycoordinate
OR
•(Radius)(Angle) : if each data-point is a Radius and Anglecoordinate.
Characters that are ignored in the data-file:
•Header lines, when entered as text.
•ASCII characters that are NOT : . , -, 0–9, in all lines.
Optional: Data Offset and Scale option
Options:
x , y
When you add a Point-Cloud, you select a Part. The Part has an origin - its start-Point - where its XY coordinates are (0,0)
If the origin of the Point-Cloud has an offset relative to the origin of the Part, you can remove the offset. Enter -X, -Y, the negative of the offset.
Or, to offset the Point-Cloud, by (X,Y), enter (X,Y) values.
File Rotary Units ; File Linear Units
Select the units that match those of the originalPoint-Cloud data-file.
File Formats:
Pre-Select a File Format
To help you with the formatting, you can use the Pre-Select a File Format from the drop-down list-box.
When any of these formats do not represent the format of the data in your data-file, then edit the format in the Edit File Format box directly.
Example: Data-Files and File-Formats and Enter File Format.
Example 1: Data-File:
Enter File Format: () () (x) (y)
Why?
Line 1
Is Not imported - text only (A, B, C, ... Z)
Line 2
Is Not imported - text only (A, B, C, ... Z)
Line 3: Column 1 and Column 2:
Are Not imported because of () ()in the File Format () () (x) (y)removes these two Columns
Line 3: Column 3 and Column 4
Are Imported because the (x) (y) in the File Format() ()(x) (y) identify that these Columns as x, y data
Lines 4, 5, 6, ...
Equal to Line 3
Example 2: Data-File
Data Format: N100 G00 X10 Y25 Z27
EnterFile Format: () () (x) (y) ()
Why?
N100 G00 X10 Y25 Z27
Letters - not imported (A, B, C, ... Z)
N100G00X10Y25Z27
Column 1,Column 2, and Column 5- not imported - the () in the File Format() () (x) (y) ()
10 25
Imported - the (X) and (Y) in the File Format() () (x) (y) ()
When you import Point-Cloud data, the chart shows the Points, the Curve, Nothing, or Points +Curve
In the chart below, the Continuous Curve does not follow the Point-Cloud data - it is planned and to see the different charts ONLY.
The two charts show as one chart after you successfully Fit the Continuous Curve to the Point-Cloud data when you increase the number of Harmonics.
Point-Cloud dialog > Fit Curve to Data tab
Parameters
Original Data Accuracy
This is a judgment you must make. Start with 0.1 then reduce it to approximately 0.001 - but see Original Data Accuracy for more thoughts.
Auto-Fitcheck-box andFit Curve button
Usually, click the Auto-Fit button to make it active - see options
Increase the # Harmonics
Edit the # Harmonics
The difference between the Continuous-Curve and the Imported Data decreases as you increase the # Harmonic.
Fit-Quality =0 >> 1
When Fit Quality Traffic Light is Green, ...
or
When the number in the Fit-Quality Number box is near to, or equal to, one(1), ...
... STOP - do not increase the number of Harmonics.
Display Options
Click one of the four radio-buttons
○Show Nothing
○Points only
○Points and Curve
○Curve Only
The view of the Continuous-Curve and the Point-Cloud in the graphics-area match the P, V, or A button.
Steps to do in Fit Curve
A.Edit the # Harmonics
☑Auto-FitCheck-box
The Curve updates immediately each time you edit the# Harmonics
❑Auto-Fit check-box is clear.
The Curve only updates when you click Fit Curve
B.Repeat A
Increase the # Harmonics until the Fit-Quality =~1, and the Traffic-Light is Green or Orange.
We recommend the Maximum # Harmonics < # Data-Points in the Point-Cloud / 3.
Velocity and Acceleration Graphs and Filter Width
The default plot is Position. If you want to plot the Point-Cloud and the Curve as Velocity or Acceleration (), then click the V or theA icon.
Even if the Fit Quality = 1, you can continue to increase the number of # Harmonics to improve the fit of the Velocity and/or Acceleration Curve to the Point-Cloud.
However, we recommend the Maximum # Harmonics = # Points in the Point-Cloud/3.
If the plot of the Velocity or Acceleration data is noisy you can smooth the noise (remove the noise) with the Filter-Width. This may help you identify the original Motion-Law.
Original Data Accuracy
Thoughts:
•Consider an Original Data Accuracy of 0.1, then reduce it to approximately 0.001.
•Do not enter a value that is more accurate than the original accuracy of the data. For example, if the data has 2 d.p. , then 0.05 OK, and 0.001 is not a sensible value. However, experiment, as you find that more accuracy gives you better results.
•Is the skill of the person that measured the Cam-Profile a factor?
•Is the Cam-Profile clean? Is the Cam-Profile worn? Is the Cam-Profile damaged?
Machine Measurement Accuracy Approximations: per 100mm Diameter of Cam Diameter:
•Temperature-Controlled (18-22ºC) CMM approximately 0.2 - 2µm
•Non-temperature-controlled CMM approximately 2 - 10µm (~h4 for a 100mm shaft)
•Portable CMM approximately 5 - 20µm(~h5-h6 for a 100mm shaft)
•Test Rigs are variable, but you should aim for approximately 20 - 100µm (~h8-h9 for a 100mm shaft)