4 ms·
Once you get down to below 1/1000 of an inch or so, you start to notice that metal is really like playdough. it squishes out in all directions when you clamp
by opwieurposiu 7y ago
Once you get down to below 1/1000 of an inch or so, you start to notice that metal is really like playdough. it squishes out in all directions when you clamp it, it springs back when you cut it. it is never exactly the same shape after it has been handled.
Just another thing that adds to the difficulty of super high precision work.
- sansnomme 7y agoWhat do you use to observe such phenomenon? Optical microscopes?
- mrob 7y agoOften using a dial indicator. A rack and pinion converts the linear to rotary motion, and gears magnify the rotary motion: https://en.wikipedia.org/wiki/Indicator_(distance_amplifying_instrument) https://en.wikipedia.org/wiki/Indicator_(distance_amplifying... tubalcain has a good video showing how they work: https://www.youtube.com/watch?v=Rp6D3YTx7iU https://www.youtube.com/watch?v=Rp6D3YTx7iU
- jbay808 7y agoYou can use an optical flat. Interference fringe patterns will tell you how a surface that was cut perfectly flat on a machine becomes bowl shaped when you unmount the part. https://en.m.wikipedia.org/wiki/Optical_flat https://en.m.wikipedia.org/wiki/Optical_flat
- robomartin 7y agoYup. I often refer to aluminum as “rubber” when chasing that last few thau while machining. I do this to remind myself and others to have the right perspective and expectations when approaching things at this scale. Just because the machine displays four digits after the decimal point it doesn’t mean you can actually cut at that level.