A study on the parameters of surface texture

Τίτλος

A study on the parameters of surface texture

Θέμα

Surfaces (Technology)

Δημιουργός

Sevastides, Christos

Πηγή

Higher Technical Institute

Το πλήρες κείμενο είναι διαθέσιμο από το Υπουργείο Ενέργειας, Εμπορίου Βιομηχανίας και Τουρισμού

Εκδότης

Library of Cyprus University of Technology

Ημερομηνία

1998

Συνεισφέρων

Messaritis, V.

Μορφή

pdf

Γλώσσα

en

Τύπος

text

Αναγνωριστικό

MED0294

Σύνοψη

"There shall be standard measures of wine, ale and corn (the London quarter), throughout the kingdom. There shall also be a standard width of dyed cloth,
russet and haberject, namely two ells within the selvedges. Weights are to be standardized similarly."
(Magna Carta, Clause 35, AD 1215)
"At one time the terms 'rough machine', 'medium machine' and 'fine machine' or equivalent symbols, were used on drawings leaving the surface to be controlled by limitations of the machining process involved and arbitrary opinions of operator and inspector which, all too often did not coincide.
Most of the uncertainties of specifying surface requirements have been eliminated by development of instruments for the measurement of surface texture on a numerical basis and by the issue of various national standards ......... "
(B.S. 1134, part 2, 1972)
Both of the documents quoted above, although different in time by over seven and a have centuries are dealing with the same problem - that of measurement - and both solve it in the same way by laying down standards of measures and specifying methods of making the measurements. The clause in Magna Carta looks at the problem from the point of view of commerce and what we now call 'consumer protection'; the British Standard discusses the problem from the aspect of engineering quality control.
It is obviously very important to standardize the common weights and measures (e.g. the kilogram, meter and liter) used in everyday life, in trade, in engineering and scientific research. The present universal acceptance of these measures is the culmination of a long series of attempts, extending back into biblical times, to enforce the use of standard units of measurements, Magna Carta being a comparatively late degree in the history of standardization.
However there are some other qualities of manufactured articles which cannot be so easily specified. Colour is one example; surface finish another and this is the subject where this is investigation is based on.