![]() If anyone has the document, could they please post it to ? Metals & Metallurgy section. But evidently there is an ongoing need for this information. This thread is quite old, and Andrew Provan is no longer reachable. I am still trying to locate a copy of that chart though and any help you can provide will be greatly appreciated. Some paper is treated with a soap-like substance to reduce clogging ( stearated or nonclog. Wood is best sanded with open coat paper. I just figured that since it was so old that maybe things had changed. On closed-coat sandpaper, the grit covers 100 of the surface on open-coat paper it covers 50 to 70 of the surface, the advantage being that the paper doesnt clog as easily. Fine - Modest sharpening rate, leaves metal edge with frosted appearance. Sandpapers are classified mainly into two groups depending on their grit. Similarly, the 220 Gritsandpaper has 220 of these tiny particles per square inch. 80 grit sandpaper, for example, contains 80 abrasive particles per square inch. Finer than medium but sharpening rate slower. Grit sequence is defined as the order in which multiple grits of sandpaper are used, in relation to one another, when attempting to achieve the desired finish. Sandpaper grit is the number of particles that make up the surface. Edge does not appear scratched but frosted. See the chart below for information on the most common sandpaper grits and which one to use for different types of projects. When I emailed I got an error screen that said the email doesn't exist. Medium Fine - Minimum recommended grit for final stage of most knives. Are you implying that the posted e-mail address now bounces, or he asked you to stop bothering him? He is on Linked-In, and apparently is currently with, but I don't want to contact him or have others contact him if he requested that people desist :-) Grit on the FEPA scale is indicated by the letter P before the number. In the UK, sandpaper grit is graded by the Federation of European Producers of Abrasives (FEPA). The implication of your posting is a bit vague. The Sandpaper grit chart is a numerical system that measures the coarseness of sandpaper. Can you tell me what sandpaper grit I should use (I'll do it by hand). I am trying to achieve a 32 surface finish on aluminum 6061-T6 block. What is 35RA polish finish for stainless steel T-316 ss? Alex Roman What is the surface roughness achieved by using 320 and 400 grit abrasive belts on steel and chrome? Amol Nanavati There are following correlations between Ra and Rz depending on the processing method:įor polishing: Rz = 4Ra. On a base length one can find 5 profile maximums (highest lugs) and 5 profile minimums (deepest cavities). Parameters and characteristics".įollowing this standard, Rz is the height of roughness by ten points. This one is typical for old designs based on GOST 2789-73 "Surface roughness. Have you already found the information about Rz parameter? ![]()
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