[bsder]

They cut aluminum. Generally not well.

This part is actually a typical good result in spite of how bad it is: https://youtu.be/w26DHMccicE?t=731

Deflection is bad. Repeatability is poor. etc.

If you put even mild steel on that, that machine will have no hope.

[coder543]

Okay, but if you’re expecting a magical new diode laser to cut steel any time soon… good luck. That’s what most of this discussion is about. I think starting with a cheap CNC is more likely to work out.

[bsder]

o_O?

The article literally has a video of the laser actually cutting stainless steel (aka the Devil's chewing gum). The title says "melt steel". That was the practically the whole point of making these kinds of laser.

Video link: https://youtu.be/SFXmFNTviRI

[coder543]

Actually, wow... the plot thickens. I missed this in my initial read of the article:

> We even used it to cut through steel. As the bright, beautiful beam carved a disc out of a metal plate 100 μm thick, our entire lab huddled around, watching in amazement.

So... it can cut steel! As long as the steel is 100 μm thick. I think that is literally about the thickness of a piece of paper.

This newfound information does not weaken my skepticism about the hobbyist laser mill that can cut through (useful) pieces of steel coming to a garage near you any time soon, unfortunately.

[coder543]

Yes... but you can't buy it. It's in a research lab. And even once it goes into production, what are the odds that it's going to be affordable? They can probably sell every laser they can produce at a very high price for a long time before supply catches up to demand, even though this is supposed to be easy to manufacture.

I'm just extremely skeptical of a steel-cutting laser mill being cheaper than a $10k CNC any time soon. Hardware is hard. Semiconductors are even harder.

As far as I can see, the article provides no indication of when they even hope to bring this product to market, which is never a good sign.

https://xkcd.com/678/

I would love to be wrong.

And really, that video is unsatisfying. They show a mark on the steel, but -- as far as I saw -- they never even show any steel piece that was cut out by the laser. Maybe the steel melts at the very surface... but it may not be possible to cut through a piece of steel unless it is thinner than a piece of paper? We have so little real world information on this laser.