Re: convert surface finish - Rz to Ra It might make the metric to english conversion a little less confusion if you show him where '40' comes from. If you show the mechanics behind your value he has a better chance of catching on. 40 is just a rough value from metric to english conversion. Let's first look at the wording of the formula: micro 'meters' to micro 'inches'. We all probably know that to convert millimeters to inches you divide millimeter values by 25.4. 1mm = 1/25.4in or.03937.
And to go from inches to millimeters you go.03937x25.4 = 1mm. Standard serial cable connections. You see how that.03937 looks alot like.04?
Yup,.04 is just rounded just like 40 is rounded from 39.37. See where I'm going yet? Now since the wording I pointed out in the beginning is 'micrometers' and 'microinches' you may see why our conversion is.03937 instead of 39.37. The difference is micromillimeters and micrometers. 1 meter is 1000 millimeters. The surface formula calculates micrometers to microinches, not micromillimeters to micro inches. So to convert 3 micrometers to microinches here is what we do: convert micrometers to micromillimeters.
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Rz Value
3 micrometers = 3000 micromillimeters. 3 x 1000 = 3000. Next convert 3000 micromillimeters to microinches. 3000/25.4 = 118.11 microinches. Using the correct formula instead of an abreviated formula or rounded number is much better. It's kinda like when machinists try to calculate sfpm using the value 3.82. Most never remember the formula because most don't know where 3.82 comes from.
They don't understand the mechanics. So they can never do the math.
Topic 6753 Rz to Ra; Surface texture conversion (2000) Could someone please help me out with a conversion factor. I need to convert Ra to Rz. If my print states a machined surface to be controlled to a maximum of Rz125, what would be the Ra equal? My measuring equipment has parameter settings of Rz.J, Rz.I and R3z.
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Which setting would I want if the characteristic tolerance is Rz125? Todd D last name deleted for privacy by Editor - Toledo, Ohio April 8, 2008 Rz (din) = Ra.7.2 Rz(ISO) = Ra.7.6 Ra=Rz(din)/7.2 Ra=Rz(ISO)/7.6 san last name deleted for privacy by Editor - shanghai china January 18, 2009 I want to equivalent of Rz5 in Ra value Subramani MOHAN KUMAR MACHINING - HOSUR, TAMIL NANU, INDIA This public forum has 60,000 threads. Sybase iAnywhere. If you have a question in mind which seems off topic to this thread, you might prefer to.
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To convert a known Ra value to a different parameter, use the following formula: Ra x Parameter Factor = Desired Parameter Example: Ra to Rt: 1.0 micrometer Ra x 8.7 (Rt Factor) = 8.7 micrometer Rt 40 microinch Ra x 8.7 (Rt Factor) = 348 microinch Rt Parameter Factor Rt 8.7 Rz 7.2 Rz ISO 7.6 Rmax 8.0 Rp 3.6 RPM 2.9 RMS 1.1 Surface Roughness Value Equivalents Thye Waviness is the measure of surface irregularities with a spacing greater than that of surface roughness. These usually occur due to warping, vibrations, or deflection during machining.
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