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Today we're looking at a Mitutoyo Rockwell superficial hardness tester Model 940-131 that I picked up at the Bar-Z Summer Bash swap meet. I've always wanted one of these machines, but I did not understand at all how they worked. I wasn't even sure if this one worked at all, but after a couple of weeks of research and fiddling with it, it's working great. I'll share what I learned, and maybe demystify these machines for someone else. Support Clough42 on Patreon: / clough42 Tools and other stuff in this video: *This site contains affiliate links for which I may be compensated Bambu Lab H2D 3D Printer: https://shrsl.com/4v7u6 Bambu Lab Filaments: https://shrsl.com/4w8kk Metal Silver Silk PLA (Amazon): https://amzn.to/4nLizHm Rockwell Standard Hardness Test Block (Amazon): https://amzn.to/4lPvHcG Lead Shot Balls (Amazon): https://amzn.to/3U5HEz1 ReMarkable Paper Pro Writing Tablet (Amazon*): https://amzn.to/3Qrpczc Starrett Precision Screwdriver Set (Amazon*): https://amzn.to/35taFJc 5kN Digital Force Gauge (Amazon): https://amzn.to/3Xq3Bf9 Raw Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/b... 00:00 Intro 02:41 The mystery of hardness testing 03:16 Hardness Testing Theory 09:44 Tour of the Hardness Testing Machine 14:16 Making the Missing Weight 19:11 Test Run 21:38 Measuring the Test Forces 23:12 Can You Help?