Hi folks, got something new (at least I have not seen it so far): Cutting a timing belt gear only with a slitting saw.
Main setback is, that it only works for trapezoid gear tooths, and requires cnc with a rotary axis.
Make one cut in the centre, rotate, cut the lower flank of the tooth, rotate, cut the upper flank of the tooth, rotate to next tooth...sounds pretty simple

Gcode was done by hand, suitable for Emc2.
Video of the process:
Looks like a nice timing belt gear, except that I had litte problems on the lower half of it


But issn't anything close to a fit


Problem was, that I messed up the angle between the teeth...
Another attemt after correcting the Gcode:

Now it's a nice fit:

It's not perfect as it misses the radiuses on top and bottom of the gear tooths (so it might shredd the belt after some time), but for lowtech-lowspeed-applications it should be adequate.
Stefan