several calibration sphere

[[Ca...]]

Hello, we have three calibration spheres: 25Ø, 30Ø, and 8Ø.
All are mounted on the same pallet.
I would like to determine the sphere positions automatically and not have to manually move them each time.
How can I do this?

[[Ma...]]

What's the point? Once you move that sphere, then you have to manually get it's position - there is no automatic check of ref. sphere from what i know.

But via formula you can access sphere position i think.

[[Ca...]]

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The idea is to create an automatic qualification program.
Since the pallet with the reference spheres is never in exactly the same position (+-0.02 mm), the position of all reference spheres must be recalculated for each qualification. This should be done automatically in a qualification program.

 

 

Edited March 15, 2025

[[Da...]]

'Resources > Utilities > Probing system qualification' for each reference sphere & the same MasterProbe.

[[Je...]]

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Hallo Carsten,

eine Abweichung von ±0,02mm ist kein Problem. Bei mir liegen die Abweichungen eher beim Zehnfachen - in meinem Kalibrierprogramm fahre ich jede Einmesskugel deswegen zwei mal nacheinander an, das erste Mal mit sechs Punkten als "Vorausrichtung", das zweite Mal  Tensor

[[Ma...]]

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 so you are saying, that position for calibration sphere does not matter if you have a program which firstly get's it's position as base alignment and then is doing calibration of probes?

I know that for manual calibration you have to get position of calibration sphere with refference probe.

Since we have program in same way ( BA from cal. sphere with ref. probe ) do you need to get manually position of cal. sphere?

Thanks

[[Je...]]

Martin,

I don't use base-systems in my calibration programs. I first get the position of the calibration sphere in CNC mode using only six points, so the position is already quite precise. Then I get it again using tensor to achieve high accuracy.

[[To...]]

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If you put the MasterProbe in the first position in your Qualification program and are able to place the Reference Sphere in the same place on the table, i.e. removable pallet fixture, permanently mounted, etc., that allows you to run automatically without a manual intervention.  I don't know if this works with multiple reference spheres.

Edited March 17, 2025

[[Ma...]]

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 i have inherited program from previous man ( he had no experience in metrology or machining ) so i lived in that you have to first manually set cal. sphere like for manual calibration. Then you run that program - which was using master probe for base alignment origin of sphere - then it was doing calibration.

[[Je...]]

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that works with multiple reference spheres too.

I have 8: a 30mm ball in 4 positions, and a 8 mm ball in 4 positions, every position is defined as a seperate reference sphere

First I place the 30 mm ball in 45°, get the position like told above (2 times), then calibrate all stylies I need in this position on this ball, then I rotate the sphere to 135°, get the position like told above (2 times), then calibrate all stylies I need in this position on this ball... and so on...

works very well, is accurate, and saves time with 1 stylus system with 3 positions, 4 stylus systems with 13 positions and 1 stylus system with 24 positions (Vast XTR gold)

I often test the accuracy with a gauge ring, the difference in y and z (for example) from +90° to -90° (Vast XTR gold) is most under 0,0002 mm

[[Ca...]]

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Also wenn ich das richtig verstehe, Kalibriere ich im Programm zuerst alle Referenzkugel mit dem Masterprobe.
Danach kann ich alle Sensoren an den jeweiligen Kugeln Qualifizieren? 
Ich werde dass einmal testen. Dazu werde ich die Position einer ReferenzKugel einmal bewusst etwas verändern vor der Programmausführung.
Es sollten ja danach alle Sensoren im Offset zueinander stimmen?

[[Je...]]

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das kommt darauf an:

wenn du deine Referenzkugeln im Laufe des Kalibrierprogramms nicht bewegst, dann kannst du zu Beginn des Programms alle nacheinander einmessen

wenn du sie bewegst, also z.B. wie ich von 45° auf 135° auf 225° usw. drehst, dann misst du erst die erste Stellung per Referenztaster ein, dann kalibrierst du alle Taster, die zu dieser Stellung gehören, dann drehst du auf die nächste Stellung, misst diese per Referenztaster ein, dann kalibrierst du alle Taster, die zu dieser Stellung gehören usw...

und, wie ich oben geschrieben habe, ich messe jede Position per Referenztaster zwei Mal hintereinander ein, erst mit sechs Punkten, dann Tensor, das erhöht die Genauigkeit - ist aber nicht unbedingt nötig, je nachdem, wie genau (im Verhältnis zum letzten Einmessen) du deine Referenzkugel platzieren kannst

[[Ca...]]

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Danke!
Nein ich lege zuerst die Kalibrierpalette auf. Dort sind alle Referenzkugel fest installiert. Sie bewegen sich also nicht zueinander. Lediglich die Grundposition der Palette hat bei jedem auflegen eine kleine Differenz. Diese wird aber während das Kalibrierprogrammlaufes nicht bewegt.

[[Da...]]

How it works for me: