Kugelformabweichung

English translation: deviation from spherical shape

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
German term or phrase:Kugelformabweichung
English translation:deviation from spherical shape
Entered by: Kim Metzger

21:09 Jul 23, 2015
German to English translations [PRO]
Tech/Engineering - Physics
German term or phrase: Kugelformabweichung
Die Kugelformabweichung ist dem Kalibrierschein zu entnehmen.
Die vorliegende Messung führt den mittleren Durchmesser der Scheibe, die später auf den Prüfstand montiert wird, auf ein Kalibriernormal zurück, indem die Koordinaten des Scheibenumfangs mit Hilfe eines kalibrierten Koordinatenmessgeräts (KMG) gemessen werden und der mittlere Scheibendurchmesser aus diesen Koordinaten konstruiert wird.

This text is about calibrating an instrument for making length measurements.

ball shape deviation? can't find anything to confirm a translation.
Thanks for any help
Wendy Lewin
United Kingdom
Local time: 09:30
deviation from spherical shape
Explanation:
Not sure if it will fit here.
http://www.vectornav.com/docs/default-source/documentation/v...
Selected response from:

Kim Metzger
Mexico
Local time: 03:30
Grading comment
thanks
4 KudoZ points were awarded for this answer



Summary of answers provided
4 +2sphercity deviation (deviation from spherical form)
Johannes Gleim
3 +2deviation from spherical shape
Kim Metzger
3 +2deviation from spherical shape
Steffen Walter
5spherical aberration
Johannes Gleim


Discussion entries: 2





  

Answers


19 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5 peer agreement (net): +2
deviation from spherical shape


Explanation:
Not sure if it will fit here.
http://www.vectornav.com/docs/default-source/documentation/v...

Kim Metzger
Mexico
Local time: 03:30
Native speaker of: Native in EnglishEnglish
PRO pts in category: 16
Grading comment
thanks

Peer comments on this answer (and responses from the answerer)
agree  philgoddard
11 mins

agree  Andrea Garfield-Barkworth
9 hrs
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22 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5 peer agreement (net): +2
deviation from spherical shape


Explanation:
There seem to be at least some sources in which the above term is used, such as http://pyweb.swan.ac.uk/quamp/quampweb/talks/Nikolopoulosqua... (p. 10).

Steffen Walter
Germany
Local time: 10:30
Native speaker of: Native in GermanGerman

Peer comments on this answer (and responses from the answerer)
agree  Andrea Garfield-Barkworth
9 hrs

agree  Cilian O'Tuama: Eddie's done an even faster disappearance, but agree with you (and with Kim)
1 day 2 hrs
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14 hrs   confidence: Answerer confidence 5/5
spherical aberration


Explanation:
In case „Kugelabweichung“ is the real term, and the subject relates to optical measurements:

10. Die Kugelabweichung auf der Achse (sphärische Aberration).
Digitalisat: UB Weimar
https://www.deutsche-digitale-bibliothek.de/item/LCWLBQSLXSB...

Aberration
Optik
bei Linsen (Linsensystemen) auftretender Fehler, wobei die von einem Objektpunkt ausgehenden Lichtstrahlen sich nicht in einem Bildpunkt vereinigen (sphärische Aberration, Kugelabweichung); infolge Dispersion des weißen Lichts haben die Bilder farbige Ränder (chromatische Aberration, Farbabweichung).
http://www.wissen.de/lexikon/aberration-physik

Sphärische Aberration
Die sphärische Aberration, auch Öffnungsfehler oder Kugelgestaltsfehler genannt, ist ein Schärfefehler und bewirkt, dass achsparallel einfallende oder vom gleichen Objektpunkt auf der optischen Achse ausgehende Lichtstrahlen nach dem Durchgang durch das System nicht die gleiche Schnittweite haben. Sie laufen somit nicht in einem Punkt zusammen.[1] Im Allgemeinen ist die Abweichung umso stärker, je weiter außen der Strahl verläuft.
https://de.wikipedia.org/wiki/Abbildungsfehler#Sph.C3.A4risc...

Spherical aberration is an optical effect observed in an optical device (lens, mirror, etc.) that occurs due to the increased refraction of light rays when they strike a lens or a reflection of light rays when they strike a mirror near its edge, in comparison with those that strike nearer the centre. It signifies a deviation of the device from the norm, i.e., it results in an imperfection of the produced image.
https://en.wikipedia.org/wiki/Spherical_aberration

spheric aberration sphärische Aberration {f}
https://www.dict.cc/?s=spheric aberration


Johannes Gleim
Local time: 10:30
Works in field
Native speaker of: German
PRO pts in category: 5
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14 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +2
sphercity deviation (deviation from spherical form)


Explanation:
Another signification exists for „Kugelformabweichung“, perhaps applicable as we are talking about calibrating coordinate measuring equipment.

Bild 60: Dreimalige Messung von Kugel 2 des Kugelstabes mit dem 0,3 mm Hartmetall-
Kugeltaster.
Die Kugelmessungen mit der Stahl-Tastnadel zeigen erhebliche reproduzierbare
asymmetrische Anisotropien und maximale Abweichungen von der Ausgleichskugel
von durchschnittlich 1,774 μm bei einer Streuung von 251 nm. Durch Vergleich mit
den Kugeltastermessungen (Bild 60) ist ersichtlich, dass die charakteristische Form
der mit der Tastnadel gemessenen Kugelformabweichung (Bild 62) auf das
verwendete Tastelement zurückzuführen ist.
https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd...

Der Prüfkörper wird mit seiner Prüfkörperachse raumschräg auf der mit Antastpunkten versehenen Grundplatte angeordnet, wobei Grundplatte und Prüfkörper sich einzeln vor dem Zu¬ sammenbau mit Hilfe von Spezialmeßgeräten sehr gut auf Maß, Ebenheit, Geradheit der Mantellinie, Kreisform, Zylinderform, Kugelformabweichung usw. bestimmen lassen.
http://www.google.com.ar/patents/DE3719838A1?cl=de&hl=de
The specimen is placed with its Prüfkörperachse space diagonally on to comply with the probing points base, said base plate and specimen can be individually before going to sembly very well determine using Spezialmeßgeräten to size, flatness, straightness of the surface line, circular, cylindrical shape, ball shape deviation and more.
http://www.google.com.ar/patents/DE3719838A1?cl=en&hl=de
(Source: Daimler AG)

Das Kugelnormal weist eine kleine Kugelformabweichung auf und ist bezüglich ihres Durchmessers kalibriert. Nun wird mit dem Tastelement das Kugelnormal gemessen. Abweichungen im erfassten Durchmesser werden durch Abweichungen im Durchmesser des Tastelements, durch einen verzögerten Schaltpunkt bei schalten Tastsystemen oder durch Biegung bei analogen Tastsystemen (Abschnitt 4.1) verursacht.
https://www.google.de/search?hl=de&as_q="8196" "Grundfos"&as...

Dw - Kugelnenndurchmesser
Dwm - Grenzabweichung mittleres Kugeldurchmessers als selbstständige Teile
VDwL - Kugeldurchmesserschwankung im Los
VDwS - Schwankung einzelnes Kugeldurchmessers -
 Kugelformabweichung
Ra - Oberflächerauheit
http://www.oem-waelzlager.de/pdf/waelzlagerzubehoer/kugeln.p...

VDws Schwankung des Kugeldurchmessers
Ra max. Oberflächenrauheit
tDws Kugelformabweichung
http://www.komeg.de/new/documents/Taster_und_Zubehör_PR98301...

VDws Difference between the largest and smallest of the single diameters of ba
Ra max. Surface roughness
tDws Deviation from the perfect spherical form
http://www.komeg.de/new/documents/Styli_and_accessories_PRE9...

Denn Renishaw ist der einzige Hersteller von Tastereinsätzen, der eine Kugelformabweichung von höchstens 0,13 μm (Klasse 5) oder besser als Standard garantiert.
https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd...

Deviation from a spherical form tDW
The greatest radial distance in any radial plane between a sphere circumscribed around the ball surface and any point on the ball surface.
http://www.renishaw.com/en/grade-3-high-accuracy-styli--6823

Allowable Deviation from Spherical Form is the greatest radial distance in any radial plane between a sphere circumscribed around the ball surface and any point on the ball surface.
Surface Roughness is all those irregularities which form the surface relief but are not deviations of form or waviness. The measurement of this characteristic is to be made with equipment meeting the requirements of and in accordance with Standard ANSI B 46.1.
http://www.deterco.com/tech_info/conversion/afbma_ball_grade...

Deviation from Spherical Form
The greatest radial distance in any radial plane between a sphere circumscribed around the ball surface and any point on the ball surface
http://www.ballbiz.com/uk-tech-definitions.php

Measurement of deviation from spherical form
http://www.nanoball.de/S.TI/nanoball.TI/website/Bilder_Webse...

The specifications define balls in terms of a series of properties:-
• Basic Diameter - The nominal diameter of the ball eg. 10mm
• Ball Diameter Variation - The difference between the largest and smallest diameter measured for a single ball.
• Ball mean diameter - The arithmetic mean of the maximum and minimum diameters measured for the ball.
• Sphericity or Deviation from spherical form.
http://www.gmsball.co.uk/specs.html

Sphericity, or deviation from spherical form,[3] refers to how much the ball deviates from a true spherical form (out of roundness). This is measured by rotating a ball against a linear transducer with a gauge force of less than 4 grams (0.14 oz). The resulting polar graph is then circumscribed with the smallest circle possible and the difference between this circumscribed circle and the nominal ball diameter is the variation.[3]
https://en.wikipedia.org/wiki/Ball_(bearing)

math. sphericity 23 Kugelgestalt {f}
geol. math. sphericity 7 Sphärizität {f}
sphericity Kugelförmigkeit {f}
http://www.dict.cc/?s=sphericity

Testing for Sphericity: Mauchly's Test of Sphericity

As just mentioned, Mauchly's Test of Sphericity is a formal way of testing the assumption of sphericity. Although this test has been heavily criticised, often failing to detect departures from sphericity in small samples and over-detecting them in large samples, it is nonetheless a commonly used test.
:
Estimating Sphericity (ε) and How Corrections Work
The degree to which sphericity is present, or not, is represented by a statistic called epsilon (ε). An epsilon of 1 (i.e., ε = 1) indicates that the condition of sphericity is exactly met. The further epsilon decreases below 1 (i.e., ε < 1), the greater the violation of sphericity.
https://statistics.laerd.com/statistical-guides/sphericity-s...

The geometry of the finished alumina head can be summarized as shown in Fig. 5, with a sphericity deviation of better than 5 µm, ...
https://books.google.de/books?id=3mchBQAAQBAJ&pg=PA201&lpg=P...

Overview
One of the assumptions of repeated measures ANOVA is called sphericity or circularity (the two are synonyms).
:
Defining sphericity
The name is confusing. Don't try to intuit what the term sphericity means by thinking about spheres. Mathematical statistics books define the term in terms of matrix algebra. That makes it seem confusing. But, in fact, the concept is pretty easy to understand.
:
The assumption of sphericity states that the variance of the differences between treatment A and B equals the variance of the difference between A and C, which equals the variance of the differences between A and D, which equals the variance of the differences between B and D... Like all statistical assumptions, this assumption pertains to the populations from which the data were sampled, and not just to these particular data sets.
:
Quantifying deviations from sphericity
Prism quantifies deviation from sphericity by calculating and reporting the value of epsilon
http://www.graphpad.com/guides/prism/6/statistics/index.htm?...

With the help of an error separation method the absolute diameter and the sphericity deviation of small calibration spheres can be determined, and thus it serves to calibrate the probing spheres and to map their form deviations.
https://books.google.de/books?id=TGzLBQAAQBAJ&pg=PA461&lpg=P...


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Note added at 14 hrs (2015-07-24 11:29:24 GMT)
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Typing error correction:
sphericity deviation (deviation from spherical form)

Johannes Gleim
Local time: 10:30
Works in field
Native speaker of: German
PRO pts in category: 5
Notes to answerer
Asker: Wow, thanks for all your research!


Peer comments on this answer (and responses from the answerer)
agree  Trevor Holmberg
3 hrs
  -> Thank you!

agree  Hans-Jochen Trost: Here's a place where such balls/spheres are made: http://www.precisionballs.com/measuring_sphericity.php
6 hrs
  -> Danke!
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