How these impossibly thin cuts are made

Wire EDM is an insanely precise manufacturing method. But there's a trick behind this objects that appear to have no seam.

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[BryantCutler]

"... which, in inches, is... a different number." This short phrase made my whole week. I laughed so hard.

[Rubrickety]

5:15: "It does something with it and pumps out deionized water." Once again, Steve Mould lucidly explains a complex process.

[Junkt]

Hilarious how you had the plastic cover on the competition’s razor as you shaved with it. I noticed, and I salute your attention to detail and subtle humor. Same goes for the “see it even works on cheese.” I giggled.

[poro]

I love how smoothly you recalculated it to inches.

[FreakyRufus]

I was impressed by your dedication to the cheese comparison throughout the entire video.

[isaacgraphics]

I love Steve's commitment to demonstrating everything using cheese.

[tehlaser]

3:55 another benefit of submerging the part is that the liquid reduces how much eroded material gets into the air and, from there, into Richard’s lungs.

[skilletborne]

This has got to be one of the funniest and best episodes you've made so far
Between the perfect cheese analogy, the resin and the water mixing and doing, , , something? to deionize it and the "which, in inches, is a different number" I had my sides splitting

[modernfellow]

As a machinist (I do CNC work but we also do a lot of EDM work here) and it’s always satisfying when your parts fit together so perfectly and smoothly

[sevegarza]

In the 1995 World Rally Championship, Toyota infamously used engineering like this to bypass the FIA mandated turbo air restrictor plate and thus produce significantly more horsepower than their competition. There were internal springs that would open an air gap around the restrictor only once the restrictor was fully installed and the turbo was producing boost pressure. It would close when the engine was at idle/when the restrictor was removed for inspection, making it impossible to spot by the FIA inspectors.

Max Mosley, the president of the FIA at the time said this: "It is the most sophisticated and ingenious device either I or the FIA’s technical experts have seen for a long-time. It was so well made that there was no gap apparent to suggest there was any means of opening it.”

[MF-dzcp]

I love how he demonstrates how useless normal razors are by not taking the plastic piece off of the top of it 😂

[joeyoh]

6:50 "A typical wire EDM machine will have a precision of around a 5000th of a millimetre, which in inches is a different number" 😂

[cipherhex]

8:51, the difference really is remarkable!! It's almost unbelievable! You would think there must be some user error, but no, it couldnt be that! 😅

[kyouhyung]

I've been working with 3d printers for the past couple of months and I've really become to admire this kind of precise tolerances only advanced machining methods could achieve. Amazing.

[ross-carlson]

@6:55 "which in inches is another number" - EPIC

[sniper]

That shot at the beginning is wild. I had to swap to 4k and re-watch it a few times. It must have taken forever to get most of the shot to stay in focus. Thanks for all that effort!

[Alexm]

Steve Mould is legitimately one of my favorite channels, I never know what I'm going to see. Today, I saw him iron cheese.

[T_A_WOW]

As an engineer at rolls-royce who has access to one of these machines. It makes me very happy. I love making these sort of things!

[ebubeawachie]

This must be THE BEST sponsor segment I’ve ever seen on ANY YouTube video.
And I’ve been a YouTube addict for the better part of 10 years. Kudos. ❤

[Frownlandia]

The occasional "and you can do the same thing with cheese!" really sells me on the whole process.