www.pulse-jets.com

If I was trying to do that... First off, I'd make up an expanding arbor, if I were trying to pierce the bottom of a "jar" that I could get into, or contracting chuck to hold the outside. Make the thing from aluminium disks / rings, say 10mm thick and under (or over) sized by something like 0.05mm, s...

WRT the 5mm hole, it might be that they're trying to meet some ridiculous tight tolerance (either specified by you, or "default") rather than having trouble actually making a hole. I can see it being properly hard to meet, say, a radial tolerance of ±0.01mm in glass. Did you ask what the problem was?

Aww, man. That's wonderful.

The quartz jar is excellent. Well done!

What a hoot!

I'll get my coat

Go on, order a blown glass lockwood or escopette. You know you want to.

That looks wonderful. Here's hoping for some cooler weather for you to fire it up.

Etching aluminium's dead easy.

Ah, good news.

to Mark, and any other floridans.

Let us know you're alright when you can.

That looks great, man.

I wonder if this would work on quartz?

I don't see why not, power wise, although this article implies that the better the glass, the less chance it will work nicely : https://www.engraversjournal.com/articl ... index.html

Makes for an expensive squid logoed jam jar, though.

If you don't mind my asking, how much did they quote to make it?

/me has visions of a 100% quartz inline jet

Yeah, the language barrier is a big problem, mostly what you write will be translated to chinese via google translate, and the reply translated back to 'murican via google translate - machine translation's getting better, but there's still loads of room for ambiguities to become a problem. And yeah,...

If you really want to square that up, you probably want lathe + toolpost grinder. Diamond wheel on a dremel type thing would do the trick.

The idea is, as you say, compelling. Surely all that symmetry should make for better performance...

I never got anything more than very unconvincing fart noises from my attempts.