1.0IN3DTEC | Prototyping & On-demand manufacturing serviceshttps://www.in3dtec.comrich600338<blockquote class="wp-embedded-content" data-secret="1aBXfW3kPk"><a href="https://www.in3dtec.com/guide-for-surface-roughness/">Guide for surface roughness</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.in3dtec.com/guide-for-surface-roughness/embed/#?secret=1aBXfW3kPk" width="600" height="338" title="“Guide for surface roughness” — IN3DTEC | Prototyping & On-demand manufacturing services" data-secret="1aBXfW3kPk" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); </script> https://www.in3dtec.com/wp-content/uploads/2022/05/reference-sample.png723681The Arithmetic Average Roughness, noted as Ra, is the absolute average relative to the base length.For simplicity, the Ra value indicates the average surface roughness for the length of the measurement performed, i.e., the average difference between peaks and valleys.