Difference between revisions of "VTube Intersection Point Tolerances"

XYZ Intersection Tolerances

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The XYZ intersection deviation tolerances allow you to quickly qualify a part using +/- tolerances to the intersection points.

The intersection tolerances are based on values are that follow the three axes in a coordinate system. Since the tolerances measure along the axes, these tolerances can be positive or negative to also indicate a direction.

The XYZ intersection deviation tolerances are are compared to the XYZ deviations as shown in the model in this screen image.

In this case, most of the error is in the Y axis. It can be verified by seeing that the intersection point of the derived data is visually above the master point. (You can click on the image to make it larger.) The deviation data indicates that it is exactly 0.012" above the master point in the Y axis.

The reason the grid is entirely green is because the tolerance values are higher than the deviation values (in this case the tolerances are 0.039").

3D Deviation

The 0.013" value is the straight-line distance measured directly from the master to the corresponding measured points.

This is different than the deviation broken down into one of the major axes (X,Y,Z). Unless the 3D deviation line also lays on one of the major axes, it is usually larger than any of the intersection deviation values - because it combines the deviation of all three axes.

Most customers do not rely on this distance to qualify the part shape. Like XYZ intersection deviations, these values almost always exaggerate the true deviation to the outside of the straights in the tube.

You can set the default tolerance in the Part Setup menu. Scroll down to row 34.

You can set the default tolerance in the Inspection Data General Setup menu. (This is for version 2.5 and newer.)

You can set the default tolerance in the Inspection Data menu by entering a Default Tolerance at the top and pressing the Set button.

Click on the Change Grid Setup button until you see the tolerances in the grid like we show in the image on the right.

Then select and change any tolerance value. The grid will allow you to edit only the tolerances.

The second place to edit the value is in the VTube-LASER Expanded Window.

Click on the Expanded Window button to display the Expanded Window, and then make changes to the tolerances there.

The benefit of the Expanded Window is that you can view all the tolerances at the same time.

(You can click on the image to see it larger.)

The intersection deviation grids allow you to set the default tolerance to every value in a row, column, or even the entire grid using a popup menu

To use this feature, single click on a tolerance value, then right click and choose the action in the popup menu.

The screen images on the right show an example of before and after changes made to an entire column:

The XYZ Intersection deviation values can be included in reports:

1. plus tolerance values
   
2. minus tolerance values
   
3. out of tolerance values
   

The first Inspection Report in the reports menu is good for showing this data.