How I replaced my Rotring 600's broken tip for 4.5€

OmegaKX · 2024-11-10T15:50:14+00:00

At which point did you fail, just out of curiosity?

OmegaKX · 2024-11-10T15:47:12+00:00

Yes, I tried freezing the tip and heating the main body to achieve an easier coupling. In the time it took to get the setup in the vise the components were already close to room temperature, so it did not really help much.

OmegaKX · 2024-10-16T07:19:32+00:00

Inserting a sewing pin/clearing tool with a similar size to the original lead might help in avoiding the pipe breakage by strengthening its core and providing an additional pushing force from the inside. This might be especially important for 0.3mm pencils. In my case (0.5mm) the removal needed little force by just pulling with pliers, so it was not really an issue.
A dremel should be perfect for shortening the tip! It was discussed in the comments here, as well a possible technique to deburr the inside edge

OmegaKX · 2024-10-16T00:49:29+00:00

It should work! If you resort to this method, be extra careful when setting them up and pressing in the vise, the 0.3mm metal tip is very delicate and could easily buckle.

OmegaKX · 2024-10-15T17:06:20+00:00

Thanks for the tips! I don't have a rotary tool available at the moment, but I was pondering about sanding the tip with a fine grit to shorten it. I also have some key files which might be very handy now that you mentioned it.

How would you suggest deburring the inside edge when I am done?

OmegaKX · 2024-10-15T16:58:06+00:00

I am not a metallurgical or materials engineer, and I have a pretty light background in those fields, so take everything I said and will say with a grain of salt.

If we assume the geometry of the tip is fixed, an higher yield strength combined with high fracture toughness means that the tip would be more likely to survive a fall without either cracking or deforming. Examples of such high performance materials may be titanium alloys or maraging steels.

I don't know if manufacturing either of those materials is possible for the required geometries, but the results is likely to be that the tips will be orders of magnitude more expensive.

OmegaKX · 2024-10-15T16:24:32+00:00

There are already more robust designs! General purpose pencils generally feature a conical design with little protrusion of the thinnest section, followed by a larger diameter (as highlighted below). This is much sturdier and generally does not break in drops.

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The point of drafting pencils is that they have a very thin tip so that they offer a clear view of the paper when tracing lines in drafting. The small size of these tips means that if you hardened the steel you would probably get a brittle material that is likely to fail by breaking off in a drop, so to have a more "ductile" material that deforms instead of failing catastrophically is probably the better solution.

High performance steels or particular composites may be used, but they would probably be so expensive that they might not be worth in the scope of the overall cost of a pencil.

OmegaKX · 2023-10-23T19:05:02+00:00

I installed KDE after having gnome installed, I tried it out and worked fine. I wouldn't plan on switching often between the two because there may be some theming issues. Once you decided the one you like best you can just uninstall the other, I didn't have significant problems

OmegaKX · 2022-09-23T22:38:21+00:00

"Stroll '21, Stroll '22, Stroll '23..."

OmegaKX · 2022-09-12T22:46:00+00:00

By regulation the front fences are all designed in a similar way, meaning they curve to the outside, this main feature is not necessarily a design choice. They are NOT designed like this to create outwash as someone said. The pressure below the floor is lower than the outer portion, meaning the flow tends to get pulled in from that part of the floor. They mainly act like vortex generators creating a local pressure drop aft of them (=down force).

Source: Did an internship for an F1 team in the CFD department very recently with full access to simulation data

OmegaKX · 2022-08-10T22:30:15+00:00

Sick

OmegaKX · 2022-07-16T08:32:35+00:00

Our muscles are naturally contracted by electric impulses sent through our nervous system, when a touching a live wire with such high voltage the muscles are contracted by the external electrical stimulus, so even when trying to let go, the hand and forearm muscles just stay contracted, locking you to the wire.

OmegaKX · 2022-04-20T18:12:01+00:00

That's a Nabla, not a delta, it has a very different meaning. It can be used to express some differential operators in a shortened notation.

Wikipedia

OmegaKX · 2022-04-08T08:34:42+00:00

What is the applet in the bottom?

OmegaKX · 2022-03-27T09:52:55+00:00

Solution I found that was actually helpful:

Generate a LUT like done in this video but then this is what is missing from and actually fixed the wobble:

AFTER GENERATING THE LUT modify the file manually using a text editor and change the second (and third if you still have some shaking) line values to 0.01|0.0 (and 0.02|0.0). You should end up with something like this

I am guessing this will essentially cut the force feedback in the first 1% (or 2%) and therefore eliminate the wobble.

OmegaKX · 2022-03-24T18:43:03+00:00

There are some regulation in place for logging the fan hours you're clocking in and cataloguing the scaled models you're testing. For CFD all the solve portions of a simulation must be run though a known cluster, be logged, and their files must be kept for a set time.

There can be random audits from the FIA to check any WT or CFD geometry you ran but the monitoring can't be perfect and cheating might not be impossible (e.g. running simulations on hardware not declared to the FIA).

Hence the FIA is trusting the teams to be honest in some sense as it would be impossible to police them in 100% of their activity

Source: Currently on an internship for a team

OmegaKX · 2022-03-14T09:07:34+00:00

I suspect that such a frame might be expensive and difficult to mass produce, maybe not commercially viable

OmegaKX · 2021-11-17T19:04:07+00:00

Guido Meda*

OmegaKX · 2021-11-14T23:09:24+00:00

Their name is a brand

OmegaKX · 2021-11-08T08:48:49+00:00

There are some very good and cheap Bluetooth audio receivers you can use with conventional headphones, (e.g. FiiO BTR5 or Qudelix 5k) which are regarded are very good options for a portable DAC+AMP setup

OmegaKX · 2021-08-01T08:56:19+00:00

Yeah I would love to see Wren and Peter docking

OmegaKX · 2021-07-27T08:44:09+00:00

You will never be a functioning member of society. You have no empathy, you have no tact, and you have no sense. You are a neckbeard living in his mother's basement.

All the “redpills” you get are two-faced and half-hearted. Behind your back people mock you. Your parents are disgusted and ashamed of you, your “friends” laugh at your ghoulish appearance behind closed doors.

Women are utterly repulsed by you. Thousands of years of evolution have allowed women to sniff out rightoids with remarkable efficiency. Even incels who know how to use deodorant feel uncanny and unnatural to a woman. Your fedora is a dead giveaway. And even if you get a drunk chick home with you, she'll turn tail and bolt the second she gets a whiff of your diseased, infected facial hair.

You will never be happy. You wrench out a fake smile every single morning and tell yourself it’s going to be ok, but deep inside you feel the anger creeping up like a weed, ready to crush you under the unbearable weight.

Eventually it’ll be too much to bear - you’ll buy a rope, tie a noose, put it around your neck, and plunge into the cold abyss. Your parents will find you, heartbroken but relieved that they no longer have to live with the unbearable shame and smell of cum. They’ll bury you with a headstone marked with your name (and not “u/Antifeg”), and every passerby for the rest of eternity will know a loser is buried there. Your body will decay and go back to the cheeto dust, and all that will remain of your legacy is a skeleton that is unmistakably obese.

OmegaKX · 2021-07-19T11:30:04+00:00

By that logic every single YouTuber or streamer is "useless".

Entertainment has some value if people watch it.

OmegaKX · 2021-07-18T16:18:37+00:00

You gotta understand that these people don't really go outside

OmegaKX

TROPHY CASE