A friend of mine has a sandblasting cabinet, 2 guns, and in both the inner air nozzle is worn out. New ones only cost £5 each, but he's very tight & resents paying that for something which will wear out again... plus, he wants to learn to use the lathe, so making a steel one seems like an amusing project.
Since you only seem to be able to buy brass nozzles, I got to wondering.... why? Does brass abrade more slowly than steel? Why not coat one with some kind of rubberised paint, since rubber seems to resist sandblasting with pretty much anything (I presume the media just bounces off it)?
Anyway, I'm going to make a steel nozzle out of some ghastly grabby steel I've got lying around just to prove the concept, but if anyone can shed any light on why brass seems to be the preferred material?
Also... seems like a good excuse to start working on the CNC lathe again. I reckon that with a bar feeder added, I could turn these things out by the bucket load, sell them for £4.50, I'd only need to make a few hundred and the lathe's paid for

I'll just add that to the project list.... oh, seems the book is full, better buy another one!