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Help with rotating head

constadin
Hello all!

I am facing this issue and I am not sure if this is normal (it shouldn't be imo)

Setup: TIGO SF TP20 module
PC-Dmis 2017 R2

To put it simple, I am taking a vector point at -1,0,0 on a plane with a probe at A0B0 workplane Z+
I am repeating this exact same point but going from the side with A90B-90 (whatever workplane, gives the same result)... and I am having a 15 to 30 microns deviation between the 2 measurements. This applies to +1,0,0 also and to more than 1 probe.

I have 2 other TIGOS with the same setup and I have not noticed such a strange behaviour. Is it normal to have 30 micros deviation between scenario A hitting perpendicular to the probes axis and scenario B hitting parallel to it?

I find it very weird.

Finally, I am correctly calibrating, setting up parameters as move speed/ touch speed/ prehit and retract. When locating the calibration sphere in a seperate verification program, I see no deviation btw... Thanks in advance for your replies!
Parents
  • The techs came for an annual calibration and after that the head was not registering some of the hits. We changed head using one from an unused CMM (same model + everything) and the head had issues rotating. Apparently we ended up changing the head and controller (when I say we I mean the hexagon techs). Not sure how they managed compensation matrixes etc but my hint is that something went wrong there. Most probably the hardware but who know Slight smile

    The whole thread was opened actually because a colleague of mine suggested that when the probe is hitting on the probe's vector is not the intended way of probing and that he had problems with it in the past. I have also read in the past that this is indeed something to note and is worth avoiding doing but for me 20 microns are hinting another issue with the machine. After testing I see that the issue is deeper but it is a good learning opportunity to hear from you guys if you had a similar experience with parallel or perpendicular probing.
Reply
  • The techs came for an annual calibration and after that the head was not registering some of the hits. We changed head using one from an unused CMM (same model + everything) and the head had issues rotating. Apparently we ended up changing the head and controller (when I say we I mean the hexagon techs). Not sure how they managed compensation matrixes etc but my hint is that something went wrong there. Most probably the hardware but who know Slight smile

    The whole thread was opened actually because a colleague of mine suggested that when the probe is hitting on the probe's vector is not the intended way of probing and that he had problems with it in the past. I have also read in the past that this is indeed something to note and is worth avoiding doing but for me 20 microns are hinting another issue with the machine. After testing I see that the issue is deeper but it is a good learning opportunity to hear from you guys if you had a similar experience with parallel or perpendicular probing.
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