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Tolerancing Curve Form Segments

Creating different tolerance bands on a Curve Form graph


If your looking to create a graph with a tolerance variation just follow these steps.


The first step is to generate a curve then we will apply the tolerance variations.





Click on the arrow below the Clearance Group pull down menu and begin to move through the list to identify the points where the tolerance bands change. Write these numbers down.















Now open the tolerance fly out from the curve dialog box by clicking on the arrow.

















Check the Segment Tolerances

Click on Settings

When you click on Settings the follow dialog box will open. Your last point will be listed in the list.











Click on the Create Tolerance Segments icon




Begin to fill in the Start and End point values.


Enter the tolerances associated with these points.










In our example the values will look like this

1 to 299 +/- 0.180

300 to 1059  +/- 0.090

1060 to 1569 +/- 0.180

1570 to 1800 +/- 0.090


After the first entry this dialog box will appear. Answer YES the first time to remove the last point in the list. After each subsequent entry answer NO or your previous entry will be removed.





This is what the list begins to look like.

























To assist you as you define the tolerance bands you can right click on the CAD window and select Show Tolerance Lines.

Create a Curve Form Characteristic by clicking on Form and Location/ Curve Form. Open the Curve Form and select the curve as the Feature.








Open the characteristic and click on the Graphic icon. The graphic will appear like this.







Calypso Sheet Metal Part 1

Calypso offers a variety of sheet metal functions and yet these options are rarely shown in an OEM training class. These measurement techniques may also be used outside of sheet metal applications to better define a measurement strategy.
Circle
Let's say that your part flexes like sheet metal does, this makes it difficult controlling the probe depth when measuring the diameter. Three points around a diameter will help in controlling a consistent probing depth. Calypso will actually use the nominal of the feature to define where these three points should be measured.

In the circle dialog box click the Projection button, currently it show None

Now select the Working Plane Tab

Define as desired. Set the D2 radius value, as you can see the value is from the nominal edge of the diameter out onto the part. The D1 is the depth the probe  will measure the feature.

Because this is a relative measurement function the depth will be consistant no matter where the flexing moves the feature. We will cover more sheet metal applications in future articles.

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Searching for References for Selected Features

Finding the features used in Characteristics

This tip allows you to find a feature used in Characteristics in your feature list. Select a Characteristic and right-click on the mouse and choose References for selected Features
















A dialog box will open. Find the desired feature and double-click and the feature list will open highlighting the desired feature.


















Measuring a Feature with Multiple styli

The following is reprinted from CMM Quarterly Publications Zeiss CalypsMini-Books, Calypso Plan Menu

It is possible, and sometimes necessary, to measure a feature with multiple probes. Calypso will automatically define the probe travel path by inserting the clearance planes it needs to navigate around the part.

In this example we will measure a cylinder from both ends, one circle on each end of the cylinder. This will require two different probes.
















CAD Model
(No CAD Model is shown below)

If you are using a CAD model then extract the cylinder.





Click on Strategy to make adjustments on the circle paths.



Verify that the clearance plane in the Clearance Group is correct.











Double click on Circle Path1. Make sure the Stylus number is correct. This will be the first circle measured so it should match the clearance group direction.

In other words, our clearance group is –Y. This is the direction the probe is going to move along to enter our feature to probe the first diameter. Make sure the Stylus entry is correct in order to accomplish this.










Double click on Circle Path2. Make sure the Stylus number is correct. This will be the stylus that will measure the second circle of our cylinder. This stylus must be able to enter the other side of the cylinder.













Now click on OK to exist Strategy and OK to close the feature dialog box.

This dialog will appear







This looks more ominous than it actually is. What it is actually stating is that Calypso recognizes that there are more than one stylus used to check this feature and it may require additional navigational clearance planes in order to complete the task.

YES – Calypso will add the additional clearance planes to define the proper path. Calypso does an excellent job in this respect and while you should run it through slow the first time Calypso generally gets is right.

NO – You understand that additional navigation is needed but you take the responsibility to add the position points, or clearance planes needed. You have defined the path and you do not want Calypso to change this.

No CAD Model

This is handled the same as with a CAD model, however; if no CAD model exists then measure the cylinder, changing the stylus orientation between the circles. Do not worry about clearance planes just yet. When you accept the feature you will be prompted with this message.








The procedure is identical to what is shown above.