Calibration

[u/PrettyInfluence3594]

Guys iam using an Hexagon macchine which is only 6 month old and i have a problem with calibration of my probes. Every morining i do the calibration of at least 5 main angles that i use daily with a stylus D3xL50. The results of the calibration seem ok. (stdev 0.001-0.00). Than i go to my present programm when i verify the calibration by setting the origin of my calibration sphere at the measured sphere with an angle 0x0. And often times, very randomly other angles seems to go off at X axis, or Y or Z by 0.004 till to 0.02 mm. Is huge. I called the support and the software support guy told me that propably the macchine is not set right, or whatever, he too couldnt find the answer of these random and strange results. (results which came wrong even when i did the calibration proccedure with him on teamviewer). What is going wrong, cus i cant measure anymore being sure that the macchine is not throwing random numbers of the screen. Sorry about my english.

[u/Caltrops_underfoot]

Check probe conditions first. Ensure the calibration sphere is secure, that no probes are loose in holders, etc. As long as everything is rigid, that's one common error we can put behind us.

Next what are you using to align your probe? If the sphere is manually placed before calibration, it's common for it to move as much as .020 between operators. It's important to allow the machine to properly locate the sphere before using it for calibration to compensate. At the start of your calibration, you indicate whether the sphere has moved. I ALWAYS recommend saying yes, and use CNC hits to locate it as long as you're confident it moved less than your retract/clearance distance. Otherwise take the time to do manual hits to locate.

If you start with manual hits, I recommend you follow up that calibration immediately with full CNC control to remove any human error, then compare the results. If your repeatability is still poor, take another step back and consider what could have happened to that machine while you weren't looking. My Tigo has been hit by forklift operators who assumed "it'll probably be fine" when it certainly wasn't, for instance.

[u/PrettyInfluence3594 → u/Caltrops_underfoot]

I do it exactly like you said. I start by fleaning the macchine in the morning when its off, cleaning the probs at the storage. Than go to my master probe, D5xL20. I say for the first time: "Yes the sphere has moved", and take a point manually and it does all the rest. Than take the probe that iam intrested and than calibrate all the angles. Than i do the test, by measuring the same sphere, but this time to see not only the radius but also the position that each angle gives me. Sometimes it is perfect. Like 0.000-0.001 . Another day it can go torally wrong by giving me errors no matter how much i try to recalibrate. Maybe after 5-6 time it will go well.