Angle dimension out of spec.

[Sl33stak]

I have a newbie question. I have a 3D angle between two planes being checked. It is always in spec, until now. So now that it is out of spec by 3degrees I honestly have NO IDEA how to tell how the angle is out, or rather how to tell the set up guys how to move to bring it in. It is out -3.1 degrees.

[Paul Sarrach]

Protractor, to verify your results. can I see a pic or the print, If it is really out, I would have to see what your talking about before any advice can be given

[John Kingston]

Like Paul said, look at it another way. Take it OFF the CMM and put it on a plate. Try verifying it with a sine bar or compound sine plate. Too often we allow ourselves to rely on the technology advancements and forget about the old way. How would you check this if the CMM was down for repair?

[John Kugler]

Send it out and have someone else do it??

[rebeldude]

At 3 degrees out you should quickly and easily be able to see that with a protractor

[Matthew D. Hoedeman]

You could always use vector points and report the "T" deviation. If you don't have CAD data, but you DO have nominal information, you could run the program "offline" so that the planes would go back to nominal position, then simply create some points in the planes (projections or intersections) and use those for the nominal XYZ for the vector points. Then you would know if the off-angle plane was 'heavy' or 'light' and where.

[craiger_ny]

Turn Graphics ON to get an idea of how the CMM is seeing the feature in the graphics window. You may have to scale it up or down (Miltiplier) to get the exageration you want. Then what the rest of these guys said.

Craig

[Bassbuff]

If your angle measure is say 20 degrees and you are a -3 degrees, wouldn't it be 17 degrees. And if you were a positive 3 degrees, it would be 23 degrees. That's the way I would read it. You could check it on a Comparator to be sure.

[craiger_ny]

If you deleted and recreated that plane (even if you gave it the same name) it would disapear from the dimension block. Wheather or not it would revert to X axis I don't know. Do you remember editing that plane?

Craig