We got the latest Fabkit and had just 3 mm space (= focus) between the nozzle of the laser head and the workpiece.
So I went to the lathe and turned down a short nozzle from a piece of brass rod.
The thread is M24x1 and the angles are 108 degree (= angle of the drill bit). The outlet hole is 4 mm in diameter.
First i turned down to size, then drilled the inner hole, fiddled out the outer angle and turned the outer cone.
Here you can see the finished nozzle:
We now have a greater focal distance of 10,5 mm and do not crash into clamps and stuff.
On the down side we got more burning next to the cuts. With sanding afterwards or masking tape we get a better finish.
The next modification will be a better air compressor.
The one the fabkit came with has at maximum 0,35 bar pressure and 20 L/min air flow, but is switchable simply by the rudia controller. Looking for some with at least twice the power (pressure & flow).
Still looking for fitting devices. Any recommendations?
Jonas from Makerspace Greifswald eV.