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Offset in CMM

Darius_HP
Hi,

I am running our brand new CMM for the first time and I am seeing that in DCC mode the machine has an offset. I wrote a very simple program to do manual and then automated alignment. When machine goes into DC mode and tries measuring the first plane it misses the plane by ~6mm. If there is no crash the program continues and measures all three planes but with the offset. It is very easy to see because my planes are thin pads on big housing. I am also new to CMM and have no idea why this is happening. Any suggestions?​
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  • Is this part a machining or moulding and how good are the datum features. Taking PLNA as an example are you just measuring the 1 off small pad area as the datum, from the picture it would appear to show 3 pads that possibly form the datum face if so this could be the cause of the problem with unstable datums defined.

    Right?? I'd be measuring a 4 hit plane on each of those pads and then constructing them all together to make one plane
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  • Is this part a machining or moulding and how good are the datum features. Taking PLNA as an example are you just measuring the 1 off small pad area as the datum, from the picture it would appear to show 3 pads that possibly form the datum face if so this could be the cause of the problem with unstable datums defined.

    Right?? I'd be measuring a 4 hit plane on each of those pads and then constructing them all together to make one plane
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