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.
Ninja, Yes I calibrate the Knuckle probe with the Y+ Direction of the sphere. The sphere has been in one place so I don't have to use he Master to locate it.
I typically Calibrate my probes every program I run. I can show you my Calibrations Stats for the Knuckle. I use scanning probes so I do 24 hits on 4 levels.
If your calibration method has always produced good results in the past, but is no longer, one or more of your components is degrading.
1) clean, and relocate qualification sphere.
2) clean contact area/kinematic mounts of stylus holder
3) lower matrix qualification, at least you'll know if the probe head is hopeless
4) temporarily bypass the extension. Remove it (temporarily), if the similar (minus extension) stylus system qualifies without problems, there you go.
5) after that, just replace one component at a time, cheapest piece first
6) if none of that works, it may be time for a new probe head. Even though you don't appear to exceed weight limits, that would be all that's left...
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.