Author Topic: Blue Plastic Nuts For Wood Self Fabricated (Read 8417 times)

mrfatboy · « **Reply #25 on:** February 11, 2021, 01:01:30 »

On the second version with the hole, is the hole the same diameter all the way through? I actually designed the hole to be 4mm in diameter about half way down from the top so it can be tapped to 5mm. The rest of the hole is 5mm in diameter the rest down with no threads like original.

neelyrc · « **Reply #26 on:** February 11, 2021, 03:17:36 »

Chip, thanks for chipping in on this topic (of course pun intended!). The collaboration in the development of this small part by a group of members with varying skill sets is a testament to the strength of the group.

I also look forward to seeing you share your MB and particularly113 knowledge and experience on other topics.

Pawel66 · « **Reply #27 on:** February 11, 2021, 07:35:12 »

Quote from: mrfatboy on February 11, 2021, 01:01:30

On the second version with the hole, is the hole the same diameter all the way through? I actually designed the hole to be 4mm in diameter about half way down from the top so it can be tapped to 5mm. The rest of the hole is 5mm in diameter the rest down with no threads like original.

It may not be seen on the pictures, but this is how it printed - 5mm half way down, then 4mm for threading.

wwheeler · « **Reply #28 on:** February 11, 2021, 21:53:23 »

Chip,

I have a question about material since you are an accomplished 3D printer. My local printer was wanting to use PLA because of cost, availability and good color selection. I looked that up and the main concern with that material is higher temps. But also said it is vegetable based and is biodegradable! I don't think that is a good option for this nut that is well hidden under the dash. No one wants to replace it again once it is installed.

He is considering using ABS which I think is a far better material for this application. What do you think?

Wallace

doitwright · « **Reply #29 on:** February 16, 2021, 18:19:23 »

Don’t have a 3D printer? Check https://oldtimer-ersatzteile24.de/Knurled-nut-for-trim-strips-blue-D-15x85-thread-M4

Pawel66 · « **Reply #30 on:** February 16, 2021, 18:45:35 »

I saved EUR 70!

Gewinde M4? we did M5....

mrfatboy · « **Reply #31 on:** February 16, 2021, 18:56:48 »

The hole was made to 4mm. You need to tap it to 5mm. The nut is 9mm. I believe Wallace even verified the original fits a 5mm stud.

66andBlue · « **Reply #32 on:** February 16, 2021, 19:24:43 »

M5; see: https://www.sl113.org/forums/index.php?topic=32460.msg236316
Replies #19 + 20

Pawel66 · « **Reply #33 on:** February 16, 2021, 21:48:06 »

Yes, yes. They made a mistake. In description or in the nut.

wwheeler · « **Reply #34 on:** February 16, 2021, 22:25:03 »

I think the nut shown on the Oldtimer site is the shorter 4mm dash nut as used on the W111/W110 Sedans. Gewinde M4 translates to 4MM thread. Joe pointed out earlier that the sedans use a different nut (4mm) than does the Pagoda or the W111 coupes and cabs which is absolutely a 5mm thread.

Some confusion may have a risen because we chose not to print the threads for quality reasons. The ID hole was left at 4mm and needs to be finished out to make the correct 5mm thread.

Clear as mud?

Pawel66 · « **Reply #35 on:** February 16, 2021, 22:29:25 »

ok, I see, thank you.

It is a nut for sedans for different application. The description was clear. They made a nut for sedans and they put it in W113 section too. It is a product placement mistake - nut for trim strips. Different nut from different fairytale.

mrfatboy · « **Reply #36 on:** February 16, 2021, 23:40:19 »

Yes. Smaller one has 4mm threads.

wwheeler · « **Reply #37 on:** February 17, 2021, 04:02:05 »

Much ado about nuts.

mrfatboy · « **Reply #38 on:** February 17, 2021, 04:13:20 »

Fun fact. Those are actually 66nblue’s nuts. 🤣🤣🤣🤣🤣.

wwheeler · « **Reply #39 on:** February 17, 2021, 17:07:20 »

Nice!

66andBlue · « **Reply #40 on:** February 17, 2021, 18:58:46 »

Quote from: mrfatboy on February 17, 2021, 04:13:20

Fun fact. Those are actually 66nblue’s nuts. 🤣🤣🤣🤣🤣.

Mardi Gras is over and the Fatboy is still nuts!

When will it end? 🙄

wwheeler · « **Reply #41 on:** February 27, 2021, 00:15:40 »

FREE PARTS: I have (30) spare blue plastic nuts and obviously don't need that many. Like Pawell's, they are not as smooth as a molded part but function just fine and have the blue color. These were printed using the STL file from mrfatboy. They need to be tapped and can be done so very easily with a 5mm tap. Also there is a plug in the hollow end that was used to support the nut during printing and it chips away easily.

I will ship these in lots of (5) to whomever is interested for FREE if you pay shipping (US only). Attached are pics. I will have to get a quote, But I imagine shipping would be no more than $5.

PM me if you are interested.

Charles 230SL · « **Reply #42 on:** February 27, 2021, 00:31:01 »

hello Wallace, PM sent,, vr, Charles

mrfatboy · « **Reply #43 on:** February 27, 2021, 00:34:55 »

That’s better than white ones at $8 a piece plus shipping🤣🤣🤣👍👍👍

If you have a little OCD I bet you could clean them up with some 600 grit sand paper 🤣

There are different types of 3D printers out there. I have seen “Resin” types that would print a much cleaner version. I have no idea of cost

All in all. Good job👍

wwheeler · « **Reply #44 on:** February 27, 2021, 00:50:50 »

BTW, these are ABS material and yes could smooth out with just about any solvent. ABS solvent melts very easily. The first material my 3D printer wanted to use was PLA which is a vegetable based material and biodegrades. It is cheap, plentiful with loads of colors. I don't trust that PLA will last under the dash for 20+ years without falling apart. Not worth the risk to me. So I made sure it was ABS.

mrfatboy · « **Reply #45 on:** February 27, 2021, 01:01:58 »

Is PLA the same as resin? I know JonB and I had our vintage battery caps made out of ABS for the reasons you stated.

I saw a video in which a guy bathed the printed item in a acetone vapor bath for ~30 seconds. Timing was critical. Too long and it melted away🤣

The guy poured a little acetone on a plate. Put the printed item on a raised platform on the plate so the item would not touch the acetone. Then he covered it was a clear glass so that that vapor flowed around the item. Watch and pull it out before it totally melts. 😜

wwheeler · « **Reply #46 on:** February 27, 2021, 01:35:20 »

I know much more about rubber than I do plastic. But you approach them the same way in that you have to know the pros and cons for each and match that to your application. There is no perfect material.

PLA was a new one for me and not sure if it resin. Seems like there are a few different methods used for printing. This is all new to me as well.

I have worked with ABS before and not surprised that acetone vapor will effect it. Solvent welding is the primary way to repair ABS. Just melt, clamp and let vapors evaporate.

wwheeler · « **Reply #47 on:** February 27, 2021, 04:49:04 »

I just compared the thread feel of the original blue nut, the white Mercedes replacement nut (#000 990 06 50) and the 3D printed nuts I have. Interestingly, both Mercedes-made nuts have a light self locking feature as the screw nears the top. If you run a tap straight through a 3D printed nut as I did, there is no locking feature and the thread feel is uniform throughout.

So I am going to experiment and use a tapered tap but not run it all the way through. But rather stop at some point before the threads are completely cleaned up. That should result in a "self locking" feature just at the top.

Pawel66 · « **Reply #48 on:** February 27, 2021, 19:58:47 »

Wallace, in a highly unlikely event of failing to create the self-locking lip doing the way you described, here is alternative I exercised:
- screw in the screw into the nut in such a way that the tip of the screw is still hidden in the threaded part of nut by, say, 0.5mm
- heat up the tip of the nut
- press it against something

The more distance you leave between the edge of the nut and the tip of the screw, the higher self locking force you will receive.

wwheeler · « **Reply #49 on:** February 27, 2021, 21:52:40 »

Good thought and that should work just fine.

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Author Topic: Blue Plastic Nuts For Wood Self Fabricated (Read 8417 times)