Building the most accurate DIY CNC lathe in the world [video]

For a more rough and ready, but quite entertaining, version of the DIY CNC (mill however) build there's the sage of Not An Engineer's build of a DIY CNC mill.

https://www.youtube.com/watch?v=uallSKJGoug&list=PL3NwjxPeyb...

I love that channel so much

Not CNC, but I am addicted to the Cutting Edge Engineering channel:

https://www.youtube.com/channel/UC2wdo5vU7bPBNzyC2nnwmNQ

I can't believe this kid can afford an incredible amount of expensive tools.. daddys money?

Sadly no episode this week as Kurtis' father died unexpectedly.

Before I started watching CEE, I watched Abom79

https://www.youtube.com/@Abom79/videos

He has a bunch of lathe video's too.

Why cast such negative aspersions on a stranger doing good work?

If you are smart and patient you can find good used machine tools for very cheap (relative to their new cost). I would guess that buying a new Honda Civic costs more than what this person has in their shop. And if you bother to watch the video, you see at the end that he takes what he makes home to a different shop, implying that this is a shared or borrowed set of machine tools. Buying a bunch of tools that will hold their value while producing more value is not a sign of being reckless with someone else’s money.

Would you make such judgements about every Honda owner for spending a five figure sum?

Know a guy who bought a 2 trailers loads of lathes and assorted machine tools for less than 10k in the Rust Belt. Was even remanufacturing diesel engines

I also was impressed at Chris Borge's lathe build:

https://www.youtube.com/watch?v=6Js8erWbsDQ

It's small and kind of underpowered, but not useless! The central idea is to 3D print shells that hold metal parts and are then filled with concrete for rigidity and mass. Quite clever, I think.

While interesting he hasn't read the gingery books and has made several 'mistakes' that gingery tells you how todo better. Though there is plenty of fault to pick in the gingery designs they show a clear understanding of how to do things and the mistakes are compromises based on materials available not a failure to understand precision.

Also Maxim Kachurovskiy: https://www.youtube.com/watch?v=lnFw8G95LGo

Someday when I have time, after I fix my little rowboat, and sew the clothes/bags I want, and fix the porch, and, and, and...

For now there's satisfaction watching others do some of the project I haven't made time for.

This guy is quite interesting, because he starts from scratch without reading or experience, so you end up with a really wonky machine, but it's wonky in unusual ways that really make you think. Like the sibling comment says, it's obvious he hasn't read the Gingery books. This sounds like I'm throwing shit, but I'm not - it's actually how I work a lot of the time. Making a mistake gives you a deeper understanding of the issue than you would typically get from doing things the right way. For example, he overheated the gravers while sharpening them, which made them soft, and now he gets to learn about annealing and temper. And indeed, in the comments, he gets:

>Just for future reference on making gravers, you were correct that you do not want to get the pre-hardened steel red hot or it will lose its heat treatment. However you have to go much further than that and not allow it to heat above the desired temper temperature. For instance if it was previously tempered to a straw (yellowish brown) color but then while grinding it the steel turns blue, that means you have reduced the temper to a lower hardness. So you need to keep the steel cool and never let the temperature go beyond the desired temper temperature. You can think of it this way, hardening the steel makes it as hard as it can get (but too brittle to be good for much), then tempering reduces the hardness but makes it stronger, and this effect continues the hotter you temper it.

n.b. this sort of thing is absolutely endemic in the world of 3D printing, which is why most videos are fairly useless to learn from, but the comments are invaluable.