hello all
my small tip (0.5mm) always measures stuff bigger than it really is. (about .006-0.1mm) even tho i just calibrated it.
it calibration results it get good std, but the the diameter always measures to 0.480 mm.
anyone has any tips & tricks for my small tip?
I would not worry about the size reading 0.480 it is normal for the ball to read smaller as an example our 0.7 styli read around 0.638 but give very repeatable accurate results.
If you are getting up to 0.1 errors, I would advise checking the probe is not shanking out. The 0.5 ball does not have much room for error in the physical alignment of the part.
Different ruby sizes & styli lengths than advertised its a normal thing. Machine ought to calibrate & calculate how much to compensate. Like others have said check probing parameters, sphere size & touch speeds. Cal touch speeds have to be the same as with program touch speeds to start. Moreover, Hexagon level 2 training manual's got touch speeds for different probe sizes & probe heads under Autocalibration section. I use very low touch speed in calibration & programming to prevent styli bending. I also calibrate with more points than minimum on the sphere.
You have any ring gages that you can measure ? You see the same thing on a width for example ? Measuring a hole with 1 tip and comparing it to another ? Please expand on your question / information.
calibration parameters are almost the same.
for my 0.5mm tip the only difference from the other tips is that i start measuring 10 degrees above the equator not to get shank.
measuremenet speed is the same
Schlag yeah i have program that checks probes against a ring and a sphere, this is where i noticed the small tip always measures the diameter of the ring/sphere to be 0.006 - 0.012mm smaller than the other tips measures it too
have you checked the ruby size with mics? or comparator or anything to see if its correct? Sometimes deleting the probe file and making a new one clears things up when I've had stuff like that happen.
have you checked it to a standard ring gage?
do that first, get your results, and edit the tip diameter size. rinse repeat until the ring gage measures correctly.
Maybe the 10º off from equator is messing up the probe compensation(shouldn't). Can you calibrate 0º-90º and then retest your gage evaluation? it would show a change right away if it were the issue.