PowerINSPECT Best Bit From Points Alignment

Context

this document applies to :

1. PowerINSPECT 1200
2. PowerINSPECT 1300
3. PowerINSPECT 1350
4. PowerINSPECT 1355
5. PowerINSPECT 2001
6. PowerINSPECT 2200

Summary

Description

PowerINSPECT allows you to align the part to the CAD data using three or more points on the part for which you know the CAD co-ordinates, using a Best Fit method to match both set of coordinates.

Follow the steps below to create a Best Fit (Points) alignment:

1. Create a Geometric group to measure features that will provide you with at least three points as auxiliary entities, for example holes, and also a reference plane.
   
2. Make sure that you know the the XYZ coordinates in the Part Datum for at least three of the points created.
   
3. Probe the elements.
   
4. Return to the Definition level in the Sequence Tree.
   
5. On the main Element toolbar click on to display the Alignment toolbar.
   
6. Click on the button to display the following dialog box:
   
   
   
   

   	Use this button to navigate to the next point
   	Use this button to navigate to the previous point
   	Use this button to add a new point
   	Use this button to delete a point

You need to enter details for at least three points, on three different pages of this dialog box. Use the arrows button to navigate through the pages, each page shows one point. On each page, you must select the point created as part of a geometric element from the drop down list box, then enter the nominals that represent this point in the XYZ boxes.

The first point can be flagged as 'Hard Point' this means that PowerINSPECT will force this point to get the specified coordinates during the calculation.

Please check the consistency of the information you provide, especially:

• All Points must be different
• All coordinates must be different.

Example :

In this example we want to set up a pressing part that has three references holes.

The three holes are defined on three different planes, and we have extracted the coordinates of the hole centres using the Wireframe checker. (The coordinates of the holes could equally have been provided by the CAD department)

Process :

• Create a geometric group by pressing this icon :
• Suspend the immediate measurement mode by pressing  on the top Toolbar, this will allow us to define the sequence elements first, and then probe the elements on request.
• Insert a probed plane , and call it  Plane1
• Insert a probed Circle  based on Plane1 and call it  C1, we do not need to fill the nominal values here because the positioning is not yet created.
• Insert a probed plane , and call it  Plane2
• Insert a probed Circle  based on Plane2 and call it  C3
• Insert a probed plane , and call it  Plane3
• Insert a probed Circle  based on Plane3 and call it  C3

 

• Go up one level by pressing the icon
• Then insert a 3 Point Best-Fit Positonning Item:
  
• Enter the details for the first point on the first page:
  • Make sure that C1::Centre is selected
  • Enter the nominal co-ordinates for C1::Center

• Go to the next page to enter the second point's details 2 by pressing the button.
  
• Enter the details for the second point on the second page :
  • Make sure that C2::Centre is selected
  • Enter the nominal co-ordinates for C2::Center

• Apply the same method to enter the coordinates for the third point, C3::Centre.