Method to analyze point to model

[[Ja...]]

Hello,

I have a file from engineering of XYZ values from a laser scanner inspection.

This file has been loaded into my Zeiss Calypso program using the "Creating Features" option.

The point displayed is one of the values.

Engineering is requesting a comparison of the scanner values to the points I ran with this Calypso program.

My question is how to evaluate these points to the model using Calypso without running these points.

Thanks for any assistance provided.

Space Point Value.JPG

[[Je...]]

James,

Calypso is proficient at what you are attempting. The key is to construct a proper alignment. Firstly, you need to decide if you plan to evaluate each point individually to a CAD model, compare an entire point cloud that is "best fit" to a CAD model, or assign sets of points to act as datum targets that each control specified degrees of freedom, or a combination of these three options.

If you are evaluating points that are pre-defined, you need to decide how the xyz coordinate system will be established, and if it will be cartesian or polar. I wasn't sure from your description: Are you going to have the base alignment, which is primarily used for locating features to the cmm's coordinate system, define the xyz system for evaluating the laser-scanned points, or will you be making a secondary alignment? Are you measuring actual features on a CMM in order to define the CAD model's features, or will the CAD be used strictly for theoretical (basic) features? My guess would be the latter.

I have to log off for today, but perhaps someone else can explain the remainder of the process. I will try to check back tomorrow.

[[No...]]

SIde note: If it would be possible to get these points in STL format, you could set up a virtual CMM for STL evaluation. It features an additional tab to load STL data, which is only displayed when the STL CMM is "connected". Would that be an option?

[[Je...]]

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Whoh, Easter Egg! I did not know about that.

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[[Ja...]]

Hello,

Thanks for the quick replies.

Jeff, I'm looking to evaluate each point from the Cad Model, which has the base alignment already set.

Would like to use the Space Point Distance characteristic for each point to value the distance from the model surface.

Then these values would be analyzed by engineering to see how they compare to the CMM programs point values I had previously ran.

I had not heard of the method of using the STL option. I would like to attempt this method as well, but would need more information on how to set-up.

Thanks again,
James Canham

[[No...]]

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It was introduced a few years ago when Zeiss had acquired Steinbichler and began to sell the COMET optical scanners.
Note that the instructions below only work on Calypso seats with a CNC license!

Go to Extras -> Settings -> CMM

Add a new machine in the tab "Measuring system":


Select machine type "STL Import":


Connect to machine and click on STL settings:

Other settings like probe head or master probe are not needed.

For the rest please see the help files.

1.jpg

[[Ri...]]

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This method works great. Ive used it many times with scan data from a GOM.