Uploaded March 2026 | Updated September 2026, 2 weeks ago

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If you've ever wondered about the HOW or the WHY of companies doing CNC machine rigidity testing, then this video is for you. We pull back the curtain and share test results of the LongMill MK3 prototype, an MK2 and even an AltMill. (Testing the amount of deflection a machine experiences at different loads, aka the rigidity, is a good way to predict the overall performance of a CNC machine.)

More rigidity insight on our blog: sienci.com/2026/03/30/rigidity-testing-on-the-longmill-mk3

Chapters:

00:00 Introduction: Why Rigidity Matters?
01:20 Why & How We Do Testing
05:36 Comparison Testing & Goals for Test
09:14 Testing & Results
12:04 Loads & Forces Simulations Insights
18:54 Maximum Motor Force Results
23:08 Spindle & Router Power Performance
27:19 AltMill vs LongMill Comparative Results
29:45 Conclusion: Pricing Outlook & Design Transparency

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