Since the laser cutter has a fixed tube, and “flying” mirrors – it’s critical to get the alignment right over the full range of gantry movement.
It occurred to me that if I could actually *see* the path of the laser, it would make mirror alignment a whole lot easier.
Video also features my $25 air assist mod…
Getting the LED in the exact center of the laser aperture is more a matter of trial and error, but after just a few minutes fiddling I got the placement right.
Here’s an image showing really good placement – the LED is right in the middle of all mirrors. You want this kind of thing all the way through the full range of gantry movement.
It turns out that the gantry is poorly constructed (there’s a surprise!) and out of true – almost everything comes out as a parallelogram. So… it will need to be replaced. I’m currently figuring out how I can adapt my previous CNC gantry for laser cutter operation: