hexagon logo
Register Sign in
  • Replies 12 replies
  • Subscribers 222 subscribers
  • Views 150 views
  • Users 0 members are here
Options
Related

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?​
Attached Files
Parents
  • My first inclination would be probe qualification.

    You are using more than one head orientation.

    If you don't know how to qualify properly, you're going to have error between head rotations.

    Lots of threads on probe qualification.

    Pick a "Master". It is some build and probably at A0 B0. Use it, if possible, ONLY for qualifying probes.

    Measure the qualification sphere with master and say that the sphere has moved, manual hit to locate. Touch the sphere let it run.

    All other positions and stylii builds, say NO the sphere has not moved.

    If you restart the controller, Master.

    If you move the qualification sphere (unscrewing it and screwing it back down moved it), Master.

    Qual Master, Yes moved, Manual hit (don't play with DCC hit until you know what you are doing, won't damage anything but taking one hit doesn't hurt).
    All other positions and stylus builds, No moved.

    If it isn't a disk stylus, DCC + DCC, 25 hits, give it a good spacing off on prehit/retract for qualification.
Reply
  • My first inclination would be probe qualification.

    You are using more than one head orientation.

    If you don't know how to qualify properly, you're going to have error between head rotations.

    Lots of threads on probe qualification.

    Pick a "Master". It is some build and probably at A0 B0. Use it, if possible, ONLY for qualifying probes.

    Measure the qualification sphere with master and say that the sphere has moved, manual hit to locate. Touch the sphere let it run.

    All other positions and stylii builds, say NO the sphere has not moved.

    If you restart the controller, Master.

    If you move the qualification sphere (unscrewing it and screwing it back down moved it), Master.

    Qual Master, Yes moved, Manual hit (don't play with DCC hit until you know what you are doing, won't damage anything but taking one hit doesn't hurt).
    All other positions and stylus builds, No moved.

    If it isn't a disk stylus, DCC + DCC, 25 hits, give it a good spacing off on prehit/retract for qualification.
Children
No Data
© 2024 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement