Could someone please help me out with a conversion factor. Previous closely related Q&A's, oldest first: 2000 May I know the DIN & ISO numbers which specifies about the conversion factors 7.2 & 7.6 which San mentions? Ramkumar Natarajan Estimating rather than measuring is just not a good idea.Ĭurrent question and answers: October 22, 2021 If you measured the Rz you might divide by 4-7 for an estimate of Ra (in the same units), but if you measured Ra you might multiply by 10-15 or more to estimate the Rz. because the best we can hope for is a rough "correlation", a reasonably safe estimate, not a conversion.įurther, when we try to 'correlate' in lieu of measuring, we must wastefully provide overly smooth surfaces because we must apply a safety factor in each direction. The most important thing to realize about Ra, Rz, and other surface measurements is that they measure different things, just like height and weight do, so the word "conversion" is simply wrong! This is why the experts tell us to measure Rz if that's what you need to control, and to measure Ra if that's what you need to control, etc. but you certainly can't "convert" their height to a weight.
Tall people, on average, weigh more than short people, so, to a limited degree, knowing people's height might help you estimate their weight (at least on a statistical basis).
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