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Just out of curiosity. Is there any reason not to use lapping tools to make it more flat? Like the way they use them on granite surface plates. Is it because of the difference in material or is there some other reason?

Now it's time to get started on that other side!😁

let's say you find one lower spot in the middle only... you need to lower all he rest :p

What about installing hexagonal LED lighting as in in car detailing shops?

This is dumb. Who made sure the paint plate was “5 micron” smooth

But like why is this like a right of passage. Surely you have tools that could do this in a fraction of the time

I have no desire to scrape myself a surface plate, but knowing how it is done is a nice technique to file away for a repair in the future. Also 47:00 - Pauli would be proud!

I grew up in job shop machine shops, quite literally. Every time I've seen any of the machine ways and tables getting scraped, they did it in more than two different planes. Also, they typically used a much finer tool for the ways.

This video was so German it invaded Poland. I don't know how the algorithm thought this was a good idea but i watched the entire thing. 🤣

Is it possible to level the plane of a hand planer using the three plate method?

Wonderful test of patience. And what a result!

Wait, so this rough looking surface is flatter, than something that was sanded?

This seems like a great deal of work to build an air hockey table. But seriously, my regards to you for the patience and the results you've achieved. I don't _need_ so large and precise a surface plate, but I'm glad I now know what it takes to manufacture one.

Who knew making something flat could be so interesting

I am curious how you overcome the dynamic and constant and irregular deformation of the plate subsequent to random thermal changes, you know, a forearm here, a palm there, a gust of cold air from a door opening etc.

Hi! Awesome videos! I hope there are more to come. Cheers from Argentina

You don't know what true level is!!

That was so intriguing to watch. You wonder, who built the first precision machine without precision. Well now I know. So cool!

Can’t be just me thinking you’d used your actual hand to polish the surface flat😭

These are the supertasks i love. Great video btw.

Can you automate the scraping with a gantry or robotic arm? I'm guessing flaws in machines might translate onto the plate, but I'm also wondering if one might slightly randomize the movements of the machine a bit, and calibrate each run manually with data input from your ink printing method. I.e. don't automate the whole process, just help some of the monotony.

My mind was blown as a young man when I first learned about hand scraping precision flattening. Initially, it seems impossible to get something perfectly flat by such a “crude” process, but then you see the labor involved and how little material is removed at each step and it makes sense. I appreciate your dedication and willingness to share with us.

The frustrating part are the low spots that you just can’t fix, even if you don’t need to fix them, it’s nerve wracking.

30 or 40 hours? Good lord man.

39:14 I can only Like your video once unfortunately. Great edge case. Reminds me of Top Gear - the longest straight racetrack. The end isn't visible from the start because it follows the curvature of the earth. Patience of a saint!

Man hätte Natürlich die Ansaugbrücke vor und nach der Reinigung wiegen können ... 😂 Dann hättest du auch eine echte Zahl was es gebracht hat

That's pretty cool, Grownup NialRed!

.... S3xx series are SUPER soft steels, not hard.

The question is why... and measurement does not seem to avoid slowly curved plate. Better would be not to place measurement tool on workplace.

Is the semi circle from work hardening from the previous owner

Great job

That half moon is most likely a spot of impurity from the steel manufacturing. S355 is a low-alloy structural grade material. If some piece of high-alloy scrap made it into the mix, it could have failed to mix with the batch and ended up creating a hard spot in the plate.

4chan users: "I have the strongest forearms" Deviantart users: "No, I have the strongest forearms" This guy: "AMATEURS."

Beautiful

As someone who barely knows anything at all about machining it's incredibly cool to see a process like this being done by hand. It gave me an idea, which might either be a lot of unnecessary work or kind of cool: making prints of the printings, i.e. after each pass, laying a sheet of paper into the metal after the printing and rolling it down like printmakers do (which would no doubt force you to reapply the bluing, hence the extra work!). I could see this making a really cool series of art prints, plus it would be an amazing way to graph the progression of the flattening of the surface.

Ive just recently aquired my own space for hand work, soon I'll be teaching myself steel scraping. Its always helpful to see somebodies methods and philosophies on something so experience *and* technique oriented

Everyone: "What hobbies do you have?" This dude: "..."

Very nice video. I enjoyed it very much. I have limited experience scraping. I've scraped some of the ways on my milling machines and lathe, as well as a 635mm steel straight edge. Scraping steel is much more difficult than cast iron. When you were scraping this steel plate, you probably took heavy, medium, and light scraping depths. What do you think those depths were? Thanks.

What i wanna know.. is what is that beautiful black colored block made of... It looks to be Stone. But i would love to know what it is

Look at him... Acting like thats heavy or something... I mean its just a small piece of steel... How much can it REALLY weigh??? Lmao... Uhhhh yeah, definitely a joke. That is a beast of a chunk of metal. Probably near a hundred pounds

Wow... I am SOOOO very confused by what this is... And why... But its interesting. As far as i knew if you want something flat you you use a mill or lathe. Or some sort of machine. Kimda wish i understand whats going on

42:55 I spotted that someone has done enough scraping. (Check the ruler)😂

The skill, craftsmanship, and most importantly patients shown here is incredible. The surface finish that scraping gives is absolutely beautiful.

is there a no version of this without music

So this was what Marty was talking about when he found out true level

Looks like sci-fi art work.

Wenn man abschliessend mit einem neuen, flachen Bankstein drüberschleifen würde, bis das Schabe-Muster, überall gleichmäßig, annähernd verschwunden ist, könnte es die Sache nicht schlechter machen, oder ? Ok, die Ecken und Kanten könnten beim Schleifen Schwierigkeiten bereiten, sollte aber eigentlich zu bewältigen sein. Aber da kommt mir gerade der Gedanke: Während die "Berggipfel" alle ziemlich gleich hoch sind, sind die "Täler" aber keineswegs alle gleich tief ! An den Talsohlen kann man sich beim abschleifen also nicht wirklich orientieren.

i thought youd be using your palms like your literal hands to remove material

Makes a change from watching paint dry!!

Very cool