วีดีโอ

www.printables.com/model/870014-cardboard-spool-bearing-for-prusa-i3-mk3

@@KPNH That's great! Thanks!

Seek the Monochromatic rabbit hole at pfg.gg/links

@@KPNH Thanks! Looks like it'll be interesting reading!

I’ve tried running a laser through a marble or something that spread the coherent laser and that works pretty well.

@@howtoguro Yeah that's kinda what I've been thinking. My biggest concern is how to know if you've spread the laser light enough to be safe. But I'm pretty conservative with regard to injuries, especially with my eyes.

@@ParallelTransport You could just wear laser shades. Even really typical clear safety squints provide some protection against lasers. Full nuclear mode would be to view it from a secondary camera and monitor. Sadly, powerful lasers are too common. I actually bought a red laser point for a “Cat Toy” because I figured it would be weaker, but it was a class 3R so be really careful.

Actually, I usually trim them, but it has to be the next day, at least.

'Pert near like a plan! 😄

I'm still giggling. 🤣👍

Thank you 🤗

There's magic salts, and I've not researched them. But, I'm not going there.

@@KPNH Agreed, the salts I've seen are a mixture of sodium and potassium nitrate which are the oxidizers in black powder. Nothing you want in your home.

😆

Thanks! Yes, emissivity is important when using an IR thermometer. Basically, it's accurate for a "black-body radiator". Conveniently, our oxidized, blackened part is essentially that. BUT, a shiny ground part is the opposite, and the surface of a liquid is even worse. I'll try to post a link to an article that explains this. Thanks for your feedback! 👊

Hey, Steve, thanks for the input. Yes, I think the adjustments I'm going to try (soak time, quench temp) are going to help, but the cross-section is what it is. It not super-critical to have perfect uniformity, but it's a goal!! If I went crazy about it, I think I'd clamp on some filler material into the groove. But, that's beyond the scope here. Thanks for your wisdom!!

Steve, did I hear you say that you have changed from D2 to DC53 as your material of choice for steel parts? If so, how has this changed your heat treatment protocol?

@@carltauber2939 I use to make tools out of A2. D2 was to brittle for my projects. DC53 is a little more wear resistance than D2 and about the same toughness as A2. I send my parts to Hansen Bulk in Grand Rapids Michigan for heat treatment and have them do Cytogenetics treatment as well. The parts are even more wear resistance and tougher after Cryo and much more stable.

Thanks for the info!! Tell me more about your laser interferometer. 🤓👊

Thanks, Robin! Getting closer!

Not sure I understand. Can you elaborate?

@@KPNH I was talking about the T nut part of the video. I thought an option there may have been to Tig weld 2 pads instead of the shim, then file them down until you have a nice fit. It was just what came to mind, Probably because I had been Tig welding the day before lol. Its probably a classic case of "The Law of The Instrument" P.S. love the video's

@@deepwinter77 That's a good idea!

Nope.

That's what they'd be expecting. Mooohahahaha.

That's a good technique! I'm concerned about the hardness versus the geometry of this part. And we learned things.

@@KPNH Yes, I saw it. At some point I was also concerned with that, but after I tested it a couple of times and it was within 0,5HRC all around everytime, I stopped worrying about it. But I usually work with quite highly alloyed steels like ESR D2 (1.2379) so that could also make a difference.

No, sir. I'll try to explain that on the PFG.Live.

What would you do?

@@KPNH probably the same to be honest because if you handle the part enough you get a feel for it. I find it interesting that we question wrong answers more then right ones, despite the methods of acquiring the result being the same. High precision is not my field I am a general machinist, so I cannot provide a better method with actual experience to back it up, but the issue of judgement affects us all. I don’t know if a dial indicator on a stand would offer a less subjective result?

It's my garage. It's never had a car in it.

Why, yes. Yes, it was. With a bit of hardware cloth wired on. 😎👍

'Tis a puzzlement.

Guess I gotta... for Science!

Remember: this is a gage-block process (as close as I can make it). Simpler processes for simpler applications.

@@KPNHYes but lapping gauge blocks seems to be an extremely well guarded process. Understandable I suppose, but frustrating when you just want to know how it's actually done to hit the flatness, parallelism, surface finish and size to those levels. Possibly it's mentioned somewhere on the web, but I've been unable to even find how Carl Johansson managed to do it back in 1896 with supposedly little more than a modified sewing machine. I have a book with a complete chapter about what I think were the very first set of Johansson gauge blocks in North America. And even they don't speculate how he did it. They did manage an excellent prediction about how and what they might be used for though. Today my best guess is probably multiple same sized blocks are done at once, and possibly a bit like how precision ball bearings are made with counter rotating radial laps. (maybe) Hitting low millionths levels adds an order of magnitude of extra complexity as well. Luckily you don't need to hit any exact size, just flat, parallel and surface finish. Even that isn't exactly easy.

You can look up patents for gage-block lapping machines. It's pretty cool. But, don't expect a schedule of time and materials used.

@@KPNHThanks, for the tip, I'll certainly do that.

That's P3! 😆

OH.... I think you were asking about the "TMF-3"... no, that is a model number TMF 3-inch!

@@KPNH 😉. Yep, I was thinking you were being clever and have them labeled 1, 2, and 3 so you can lap 1 to 2 and 2 to 3 and 3 to 1 etc. I haven’t watched part 3 yet. And of course I know nothing about such things so my comment may just be a lot of smoke. 💨😊

I remember your hit single, "Hole Lotta Therms".

Close enuf! If it gets the right answer it's a fluke. 😐😐🤣

@@KPNH 🤣🤣

We thank @widgetworksmfg for that! 😆

No, sir, I did not. I am aware that this is a thing, but it wasn't done on this project.

Thank you, Robin!! 🫡

Another place for improvement, thanks!

Thanks for checking in, Tom! Still having fun and learning. Stay in touch.

Thanks for the visit

There's always room for tools. It's like dessert. 😆

Thanks 👍

Ideally HRC 65.

You bet! 👍

I hope so too! 😆

🤣