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Equate Alignment program problem

seppley
I have a part program, i have successfully written it to where i can flip the part, and equate the alignment, all works well, until the next part is ready to be measured. I cannot get the Dmis to go back to the startup alignment at the beginning of the program. I am forced to do a manual alignment for each part. Normally, i manually align the part once, run it through, then the next time i turn off the manual alignment features and run it over and over again letting the dcc alignment take over.

This program will not do that, everytime i start the program over again without the manual alignment features selected, it thinks that the probe head is still on the negative side of the Z axis, which is not true. I don't know why it is not looking at the startup alignment that should tell the program that the probe head is in the space relative to the machine and not the part.

any thoughts? i hope i have just missed something stupid here....

Sam
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  • NUGUY, to equate alignment, you don't need to access only your datum features. You need to have access to several features that you can probe before and after the equate.

    In my case, the part had holes every 150mm or so. It was long square tube with small plates welded on each end, and holes running the length. Basically, there was a plane and 2 holes near the end of travel that got probed, then the part was moved forward and we re-measure the same plane and two holes in the new position, equate alignment, viola! This was the only time I have ever been a part of the equate alignment process though, and I was only following directions.

    The CMM bed was around 10 ft. The probe could only reach about 12" from the front of the plate, and 24" or so from the back of the plate. Old gear driven DEA machine.

    ***
    Also, to clarify a little, I was not 'inspecting' per se. I was reverse engineering because actual condition was much more critical than how close it was to print (no CAD). And it was in 4.3 or 2009, I don't remember what version we were on at the time.

    To answer the question "how to relate to the origin?" The answer is literally "Equate Alignment". That is the purpose, in theory anyway.
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  • NUGUY, to equate alignment, you don't need to access only your datum features. You need to have access to several features that you can probe before and after the equate.

    In my case, the part had holes every 150mm or so. It was long square tube with small plates welded on each end, and holes running the length. Basically, there was a plane and 2 holes near the end of travel that got probed, then the part was moved forward and we re-measure the same plane and two holes in the new position, equate alignment, viola! This was the only time I have ever been a part of the equate alignment process though, and I was only following directions.

    The CMM bed was around 10 ft. The probe could only reach about 12" from the front of the plate, and 24" or so from the back of the plate. Old gear driven DEA machine.

    ***
    Also, to clarify a little, I was not 'inspecting' per se. I was reverse engineering because actual condition was much more critical than how close it was to print (no CAD). And it was in 4.3 or 2009, I don't remember what version we were on at the time.

    To answer the question "how to relate to the origin?" The answer is literally "Equate Alignment". That is the purpose, in theory anyway.
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