The Bulgeoning II : Increasingly Notable Bulges in Plasticity

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In this Action Packed Follow up to my last video on Bulging surfaces in Plasticity, we get simple and go back to old fashioned manufacturing techniques to achieve a more accurate solution!
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[@kreevoz9577]

Ooooh!! The mighty Bulge God has blessed us with with a new installment of this classic blockbuster!
Very cool that you took time to research the history of those tubes. Now that you mentioned the cylinder and sphere thing, I'm noticing it on screens too.. weird how it never caught my eye before. 🤔 Looks like especially a bunch of those professional TV broadcast monitors which retro gamers praise for their RGB inputs fall into the cylinder curvature type category. Very useful vid!

[@takerefuge3d]

Haha thanks! Yeah it's pretty interesting what I want to know now is the radius of the tubes and cylinders that were actually used.

[@kreevoz9577]

@@takerefuge3d Yeah.. can't find anything for that sadly. The service manuals for those CRT screens also don't mention those specs, only the type of tube one needs as replacement, which leads nowhere.

[@takerefuge3d]

Yeah me neither i found it out it's true but couldn't find any specs and I spent about an hour digging

[@kreevoz9577]

@@takerefuge3d Oooh I got something. PATENTS!! Duh!
All of this shit would be patented and google got a patent search!
I found one number so far, a curvature of radius 135cm for a screen diagonal of 51cm was mentioned in a 2003 US patent mentioning a 'conventional cathode ray tube'.
Another patent of another manufacturer considered curvature radius = screen diagonal * 1.767 to be a good mean. (slightly more curvy) [patent CN1203437A]
Another patent - GB2136199A - specifically mentions curvature calculation for X and Y axis for inner and outer tube surface. It seems that using a simple radius for the outer surface is okay, but the interior tube surface has to take the electron beam gun angles and apertures into consideration which leads to more complex curvature there, on modern tubes anyway.
I haven't found sony's patents for their cylinder type tubes yet. Annoyingly many early patents are japanese/taiwanese/korean. Most deal with spherical curvature type tubes. Many curvature radii I saw so far are in the range of 120-160cm for newer patents, and 100cm or below for old ones.
Several 'flat tubes' of the modern era seemingly use a very large radius of 500cm or more for an almost flat inner tube surface and would then make the front glass fully flat.
EP1786015A2 is a nice modern patent with a lot of numbers and some diagrams that is easier to read than many of the crusty old ones.

[@takerefuge3d]

Holy Shit, you're an absolute star we might have to a short follow up to this series or maybe do a full CRT tutorial with precise measurements provided I don't get sued!

[@onurerbay7672]

Imprinting a rectangle on a sphere 😄 definitely the best option! I didn't think about that!

[@takerefuge3d]

The simple option is often the best one!

[@jupiter_machine]

You are the Man! Keep posting I really like the Fan from GTA 5

[@takerefuge3d]

Yeah it's a really cool prop, that game had a lot of really cool little details even 11 years on it holds up in a lot of ways

[@อีลอนคาร์ก]

Thank you bro

[@takerefuge3d]

Thank you friend!