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Trouble getting good results with knuckle Probe

Good afternoon everyone, I am currently trying to measure features on a tubed part. I have a 5 way that i am using but only using two tips. I thought my knuckle was working for a little bit and I use my master to calibrate both directions and then switch to my probe build and calibrate all tip 1 angles first then change to Y+ direction for the knuckle calibration and i thought the StdDev looked ok but everytime i try to measure the features at the bottom, it is giving me Very High Results. I measured the same part a month ago and all the features were in spec underneath and now i am measuring the same part and all the features say they are way out. I am totally confused by this and I've exhausted all options. Can someone please help? Attached are images of my probe build and setup.

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  • Thank you Benj, Here is a piggy back question lol. This is somewhat different. "I am measuring this Ring Gage Manually both the Height and the Width. When I move the probe in the Y direction, I get a good Deviation from Nominal. Then I try doing hits in the X Direction and it’s showing out half a mil. But if I turn the Ring Gage in the Y direction to measure the other half, it comes out good. Should I Home the machine? I hope I explained this well enough lol. Pretty much my x direction is showing out but when I rotate it to the Y Direction, it shows up good." I tried changing Wrist Angles and its still showing a half mil deviation. I am in contact with Hexagon but just wanted to see if you have ran into this before.

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  • Thank you Benj, Here is a piggy back question lol. This is somewhat different. "I am measuring this Ring Gage Manually both the Height and the Width. When I move the probe in the Y direction, I get a good Deviation from Nominal. Then I try doing hits in the X Direction and it’s showing out half a mil. But if I turn the Ring Gage in the Y direction to measure the other half, it comes out good. Should I Home the machine? I hope I explained this well enough lol. Pretty much my x direction is showing out but when I rotate it to the Y Direction, it shows up good." I tried changing Wrist Angles and its still showing a half mil deviation. I am in contact with Hexagon but just wanted to see if you have ran into this before.

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