0.00068 millimeters of filing tolerance!
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These past couple of days, this news has been everywhere on the internet. Those who study science and engineering have basically all taken metalworking courses, and they will also come into contact with and learn about riveting to some extent in their jobs. I really can’t understand this “0.00068 millimeter filing tolerance”. Or rather: I don’t believe it! Could some expert help me clear up my doubts?
It has to be monitored using something like an optical flat, right?
If filing can achieve 0.00068, what size should the filing pattern be? 0.00068, on the nanoscale – one percent of the thickness of a hair. Look at this workshop, look at these equipment – even without considering temperature differences, how is it possible to achieve this? How is the filing tolerance defined?
Give me some advice; it’ll help me learn too. When I saw this news, I was confused and felt like all my efforts were in vain
0.00068 millimeters is equivalent to 0.68 micrometers, which corresponds to a precision level of 8–9. In other words, manual filing can achieve such a level; generally, planing can reach a precision of 0.04–0.08 micrometers, so it’s quite impressive that manual filing can also attain this level
680 nanometers is a tolerance, not roughness, buddy!
This post was last edited by wanlirn on 2022-5-6 at 14:36. I think what is referred to as the filing tolerance in the text is surface roughness, rather than geometric dimension tolerances, right? It’s impossible to use such a simplistic logic; thermal expansion and contraction also mean that such tolerances are not feasible ； Write articles? It might not sound very sophisticated to mention a low surface roughness; moreover, tolerances are certainly related to the basic dimensions. The text refers to workpieces that are 1 meter thick versus those that are 1 mm thick – there’s a huge difference between the two
1. It was this expert who introduced himself during an interview on a major platform. 2. The measuring tool is a universal length gauge, which cannot measure roughness; it is a length measurement device. 3. This great person is a recipient of the National May 1st Medal. 4. If it’s about roughness, do you think I’d still be surprised? 5. A major platform referred to him as a master craftsman from a great nation; the reports mentioned that he would soak his hands in warm water for 20 minutes every day, perform the same monotonous filing tasks over 8,000 times a day, and replace more than 200 files throughout the year. 6. His workplace is Shenyang Aircraft Corporation – I’ve been there before, and those workshops and equipment… are perfect for filming movies set during the Cultural Revolution.
Those who write articles don’t study these things. . . Just take a look. .