my small tip =(

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?

Henniger123 over 1 year ago

Good day,

please check first if the calibration and measurement are carried out with the exact same touch speed.
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UKCMM over 1 year ago

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.
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KatmandudaMeow over 1 year ago

might i sugguest checking the size of the calibration sphere and your parameters set on the cmm correlate with each other
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MattR over 1 year ago

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.
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Schlag over 1 year ago

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.
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pcdmisstudent over 1 year ago

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
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markoor99 over 1 year ago

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.
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bfire85 over 1 year ago

Is the tip defective? Have you checked the ruby under magnification to see if there is a crack?

What's your touchspeed at ?
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BIGWIG7 over 1 year ago

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.
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R2ah1ze1l over 1 year ago

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.
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