Calypso - PCM Confirm

This article focuses on the Calypso PCM command - confirm. There are times when constructing a program that as programmers we need the operator to follow specific instructions or confirm that something is a certain way before executing the program

Example: A confirmation ("confirm") in PCM

We have written a calibration routine program but we need the operator to confirm that MasterBall shaft at the '0' position before the operator executes this calibration program. This will avoid the stylus system from striking the MasterBall base during the calibration. If it is not at the '0' position I want to end the program.

Here is one way this is done.

NOTE: this example uses PCM, a optional module on Calypso.

Write the program as you normally would. When this is complete right click to access the parameter function.

Choose Parameter and this will open the Pre and Post Parameter settings dialog box

In the presetting box and type the above commands. Now there is another method to select the code above and we will cover that in a future article.
When you run the program this box will appear

The Code
VarC is a variable statement. This could be named anything. I used VarC to represent Variable Confirm.

If the answer is Yes or
if VarC equals True then continue on

If the answer is No or
if VarC equals False then
endinspection (close out the inspection run)

This can be used for a variety of situations where confirmation is required. Just change the question is the confirm statement making sure it is between quotes.

If you do not have the PCM module you may want to consider purchasing it. PCM adds a flexibility to Calypso that benefits both the programmer and operator.

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Bilateral Equal Profile

A common question about profile is, if I take the minimum and the maximum values of my profile output they don’t add up to the profile results value. What is happening with the profile calculation?

Let’s look at one of the profile tolerance zone shapes.
Bilateral (Equal Distribution)

Let’s break down this picture above:
The black line is the Nominal Geometry.
The green line is the actual profile.

The blue lines are as designated, the upper and lower tolerance lines. Taking the blueprint tolerance and dividing that number by two, i.e. 0.10 is +/- 0.05 will assign the position of these lines.
The red lines are the actual reported profile deviation. This is where things won’t seem to add up. If my min is -0.0006 and my max is 0.0009 why is it not reported as 0.0015? Instead Calypso reports the profile as 0.0018. Calypso takes the point with the greatest deviation from the nominal geometry and doubles that result for the actual profile result.
Where A is the absolute value of either the min or the max the actual profile deviation = 2xA. 
1.     Find the maximum value, or the largest deviation toward the outside of the part
2.     Find the minimum value, or the largest deviation toward the inside of the part
3.     A = The largest absolute vale of either the min, or max
4.     Reported Actual profile deviation = 2xA
Max:    .0009
Min:   -.0006
A = 0.0009
Profile Actual = 2xA = 0.0018

 NOTE FROM EDITOR: Although this article is focused on Calypso this formula is used in all softwares to calculate Bilateral Equal Distribution.


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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.