Ok guys, so I finally figured out the why my laser was loosing power. It does that only on lower power levels but if I go little over those power settings the Ampmeter reads 10mA but it stays pretty stable. Laser is loosing power only at lower power levels, and I can hear it arching on Anode side too.
Not just that I can cut through 1/8" hobby plywood with 43[feed=900,ppm=0 to 4000]. The cuts are nice and thin on the bottom but on top they are black pretty burned up and wide. Have not installed the air assist head yet. But it seems like the PPM is not changing anything for me.
Can anyone tell me if you have K40 upgraded to Ramps, what PPM you use to cut different meterials?