Mark, you really have attracted some of the smartest people to this channel. I learn so much by reading the comments on your videos, more than any group of comments I see on other channels. Thank you to everyone out there that contribute. 🙏🙏🙏🙏

Ive had the whole grounding issue explained to me very well at University. Wether you should ground shielding on only one or both ends depends on the frequency of the interference you want to shield against. For lower frequencies (500kHz - 1MHz or below) you should ground your shielding at both ends because the interference is due to induction in the conductor. In that case the shielding works by creating a magnetic field (due to the interference) that is opposite to its origin (in that case the interference) and should thereby cancel out the induction in the actual conductor you are trying to shield. For that to work you need actual current to flow, which is why the shielding needs to be grounded on both sides. For higher frequencies the interference is transmitted onto the conductor via capacitive coupling. In that case the shielding acts as the second plate of a capacitor that shorts every charge that is deposited onto it to ground. You are then not relying on the current though the shielding to cancel out the interference. In your specific case here the frequencies of the interference should be mainly due to the vfd's or similar power electronics with working frequencies well below the 500KhZ to 1MHz range which is why I believe grounding both sides would be best.

You did a great job on the cable. I had to make some engraved plates recently. I used black colorbond steel and engraved through the black paint to the zincalume underneath. You can drag engrave, rotary engrave or laser it and the factory finish looks great. Regards, Preso

At 14:57 “Jog Slow Man” well, yes, because jogging fast is called running

Great call out for the aero root cause. It’s all about doing a 8D report. Doing that for cloud service providers (CSP) failures now. Love the channel, ex pat Ozzie in USA, so fellow Anzac in Austria is familiar.

Oh, oh, If Mark has been watching Clickspring videos then we're in for a treat! I'm expecting at least another 50 nameplate cleaning videos, they have to be just perfect 😂 RIP finger.

I am glad it helped. Solder the shield to one end, a bit better this way.

5:12 at least you know the oil pum is working 😅

My brother was a senior engineer at Quantas. He was telling me the Max is an absolute disaster, old design that keeps being updated on the cheap to avoid the costs involved.

Love the math rock at ~12 minutes!

@3:21 the _easiest_ place to attach you braid is those mechanical legs you covered up with tape. It looks like some of the pairs are supposed to be shielded separately as a pair but your flat cable isn't at all, so you might have better luck with a right-angle hdmi male-female adapter (cheap) and a regular hdmi cable.

I worked on TCAS in the early 90's, but now out of the avionics industry. I enjoy the insight you provide, and the projects.

@ 12:38 ... Now that is what I call a WET Stone...

Thank you for the video, I enjoyed it as always. It's funny that you could carry on polishing and not notice that you're grinding your finger away at the same time. Good job you only had three to do and not 300, you would have just had a stump where your hand used to be. I've been following those aircraft stories with interest. As you say, hopefully aircraft news will go quiet again soon. - Heather

You could have used copper shield tape, this is the standard thing we use in case of EMI issue, expecially on fixed installation. With added kapton tape for insulation.

quite a few years ago I remember reading an article about TCAS and thinking I can't even imagine the level of computing power need to handle the air traffic back then, with today's level of air traffic the computing power needed is even higher. The reliability of such a system would have to be insanely high, IBM's latest z16 mainframe boasts nine nines of uptime and reliability, is that good enough for today's TCAS needs? All I know is, that question is way above my paygrade. 😀 Loving the build videos btw.

If you can, lay the HDMI cable flat against the grounded chassis. This can significantly help reduce immunity issues. Also, make sure that where your chassis panels mate, that there is a good electrical connection (to form a faraday cage).

I understand all the components in the chain of CNC but it still looks like magic to me. Seeing something on the computer. Pressing some buttons amd after some work you're holding the part you saw on a screen a few moments ago.

For having learned to do fiber optic connectors by hand, when you polish a piece, you must go with figure 8 movements :)

one end only the source end. connecting both provides a possible ground path for the electronics

Ground both ends, and I would use aluminum or copper tape, it's not as messy, and works better for high frequency anyway, because it's solid. There is a situation where you must not connect both ends of a shield, and that's if you already have an inner conductor, usually PE, that carries ground/earth, because you don't want any stray fault currents on the shield. Here it's fine to connect both.

very good job RotarySMP

That monitor blinking dark, looks totally dark, ie backlight goes out. So it is possibly a power supply issue since monitor backlight supplies are notorious for blinking faults etc, usually caused by dried out electro caps in the backlight psu module. Of course it MIGHT be auto turningmoff the backlight with a loss of HDMI sync, BUT in my experi3nce when there is a loss of HDMI the backlight usually stays on just the image disappears.

The marking turned out great!

angle grinder, Niko is happy

Soon you will be forced to buy a new machine to restore. Your almost done with this one. On a more serious note, what got me started watching your channel was that camera stand you made, I loked seeing and actual project coming out of these machines, not just machines fixing machines

Thanks for posting interesting content! I’ve really been enjoying your videos, especially loving the post rock style backtracks! Keep it up!

Good to hear you're getting a handle on the EMC gremlins. As to grounding braid, I wouldn't blindly ground both ends as you don't want to introduce grounding loops especially if the devices are powered from different supplies - that can introduce a lot of even weirder gremlins. I'd also look at placing ferrite beads strategically on problematic power supplies leads and cabling.

I was always told to ground at the source end of signal.

12:36 good call on switching to water!:P

12:35 If you stare into Clickspring's videos long enough, they will begin to stare back.

G’Day Mark, shield grounding/draining was always a foggy area in Avionics. Different vendors seemed to adopt conflicting strategies, and so on. We were often in doubt as to the best course of action.

One end. The one closer to the PSU and true ground.

On XFCE you can enable Mouse Emulation under accessibility. Can't remember if I had to do anything to enable it. Useful if you don't tend to use the keypad anyway

I used to operate a Mazak 5 axis and that didn't home the axis' - they were all 'absolute' encoders and set only on installation and service. It would reliably position to 0.0001mm! It was a very impressive machine with temperature controlled ball screws throughout

Maybe a bit of a Non-Sequitur but just wanted to mention that some HDMI cables have their own IP Address. It might be for the feature of wirelessly accessing what is on a monitor screen. Perhaps covertly if associated spyware is installed - In Windows you can check via Device Manager "Show Hidden Devices"

I'm not sure about your specific dials, but I know with a lot of automation specific equipment they often key the threaded portion either with a cutout or flat. Makes it much easier to clock your face plates correctly and have them stay in place. Of course, nice to have features like that usually end up costing extra as well...

I'm sure you've looked already but if you search for "u shaped hdmi adapter" would one of those fit? Alternatively a custom PCB with a HDMI plug + socket would reduce the exposure area and allow you to use a single display port to HDMI cable.

Looks really smart I think shields are normally only connected one end but might depend on the interface type 😀

Did you watch Chris at Clickspring hand engrave the Antikythera mechanism? Maybe you could have outsourced the engraving!

Shielding is not about grounding. Shieds form a channel for the emi to traverse the wire. The shied should be a fully enclosed volume. You should not ground it unless its matches the above criteria.

Interference could be going straight through the giant aperture in your housing (for the screen). Shame you can’t have ITO glass over it.

Shield one end, or you get ground loops. I'm surprised such a short cable has issues, HDMI uses differential pairs. That "cheap" aluminium roofing tape also works wonders.

As an electronics guy I do a lot of small panel engraving jobs for prototypes and test equipment etc. For 3 small discs like that, I would clamp down a lerger piece of stock to ensure flatness, then engrave all 3 in one operation. The engraving would include the centre divot (for manual drilling later), or in most of my cases I would just change the cutting tool after engraving then CNC cut out the centre holes and lastly the edges to separate the 3 parts. And mostly not steel, I have come to prefer the rear engraving plastic laminate that has clear thick top layer and a very thin rear black layer you engrave through (reversed, obviously). Actually I think that plastic it might be a German product, I ordered a heap of it years ago with some small endmills from Germany.

Aviation accidents and incidents are always complicated like you said. It usually takes a long time to do the investigation too. Hopefully they find the root causes of both of theses and fix them.....

4:54 HDMI ist ein digitales Signal also solltest du den Schirm auf beiden Seiten auflegen, bei Analogsignalen legt man den in der Theorie einseitig auf.

In the UK there is a campaign to prevent the pilot responsible for the Shoreham air crash from renewing his pilots licence. Whilst not wanting to comment on the particulars, what fascinates me is the different standards applied to drivers vs pilots. Five people a day are killed by drivers, yet no campaigns to prevent all of them from driving again and crash investigators have no power to affect change. If we applied the same rigour to motoring as we did to flying, the positive impact on society would be enormous.

If it's a sync issue, try adding an EDID minder to the cable. I keep a couple of bi-directionals in my kit for A/V installs where detection isn't ideal for the use case.

like the engraving :) looks like the lathe will be finished soon

I live in Fairbanks Alaska That 737-900 is talk of town

You should add a personnel touch to your panel. A drop of blood.

With displayport to hdmi adapters, try to buy new old stock ones from HP, Lenovo, or Dell, not generic garbage from china. I've definitely had issues with DP->HDMI adapters having that flickering issue in the past. It's not a physical connection problem, but a problem with the chipset in the adapter / the video chipset / the linux drivers.

Solder only one end, you don't want to create a ground loop

Your pinecil soldering iron will work better from a 12V barrel jack than from USB :)

Aviation is a particular case of a million unnoticed successes and a few spectacular failures. Boeing in particular seems to have cultural issues.

Production quality and quaility control at Spirit has been a long problem. According to various documents, Spirit has focused more on churning out product by over worked andunder trained workers than it has on safety. Spirit has been requiring workers to work 12 to 18 hour shifts and quality control staff have been punished for finding faults. Blairanco(sp?) has been doing a few videos on with with documentation from cases going on right now. EDIT: I forgot to say, can you get a stylus so you can reach things on the screen instead of relying on your finger?

The Boeing bolts are allegedly because QA simply has been removed! Boeing simply stopped doing QA on assemblage.

Only shield one end for signal wires. You only shield both with vfd power wires

As they say in my adopted nation: “Tidy, like”

Shield only grounded at one end

I wonder what the label disks would have looked like if you blued them before engraving.

Better you did that on the stone than on the belt sander. That is not fun... We have been having allot of conversations about the plug door as well (while on an A320 usually). It's looking like the left side plug is taken out by another vendor that installs the sat internet. Not 100% verified yet though and not sure if the right side comes out either. That said that doesn't explain the loose bracket bolts in aircraft. Most of our conversation revolves around the fact that most US made products are made by the I don't GARA method. Just throw it together cash your check and go spend it. There is no pride in workmanship in most of the country now. And talking about this in the van to the hotel that was over an hour late at 1:30am cause they couldn't find their driver... The airline didn't answer anyone until personal texts were sent then they kept trying uber and they kept cancelling... Oh I didn't mention the return flight where we almost weight restricted as the flight went from block time of 2:20 to almost 5hrs to go around weather. And they had us de ice before finally approving the new route and needing to go get more fuel... In short no one cares. If I were in a position at an airline purchasing $$$ aircraft I would have MY people on the line with a check list camera and body cam checking all the deemed to be vital type things that you can't see after assembly. But I have an issue where if I didn't do it or at least see it done I don't trust that it was done properly and this is one of the many reasons why I feel that way. One of Reagans great quotes. "Trust but verify"

I hope it isn't considered to be inappropriate to comment here regarding one of your previous video, but are the spools you used to load that Beaulieu R16 manufactured in such a way that light couldn't leak into its inner/unadvanced layers when not in the darkroom ?

Maybe consider a stylus for your touch screen?

Are your encoders push type? Used the push to reset the value to 100%.

I have seen 90* HDMI adapters.

wot no black sharpie.. that scuff to the left of the first label disk tsk tsk, joking aside great job..

hast du das Gehäuse, PC, und Bildschirm auch geerdet? am Besten ist alles auf das selbe Potenzial zu hängen. hab bei meiner CNC fräse meine Datenkabel mit Alufolie geschirmt weil ich nichts anderes hatte und erst als ich Maschine, Gehäuse und Kabel am selben Erdpotenzial hatte hats gut funktioniert.

You're in danger of finishing this project. I wonder what that would feel like? Did you see the Vulcan rocket launch? Shame the little lander won't be able to complete it's mission but at least the rocket works !

Could you please help me? I saw a tool claimed to be used in the aviation industry in a video on YT but I cannot find anymore. This tool is somewhat similar like a car battery post cleaner wire brush. It can be fastened in an electric drill chuck, it has a pilot pin and is used to clean the surrounding metal surface around a hole for the best electrical connection for a ring terminal that to be fastened to the surface as grounding for example. Could you please tell me how is this tool called and if this can be purchased easily?

Would you be open to sharing the FreeCAD file for those engravings, or at least how you got the (presumably single line?) text to work? I've been struggling to make some scrabble tiles because I can't get FreeCAD to do a non-TTF font which would be slow to machine.

I think if you ground at both ends of the shielding you could end up with ground loop problems.

6:13 did you try with a touchscreen pen?

A plaster? Real fitters wrap their fingers in blue roll then hold it in place with black electrician tape

=D

My guess is cultural issue. Boeing has shifted to wokeism.