I am new to this community, but it seems that a lot of things are happening between you so I’d like to join as a new laser cutter pall! Ofcourse I have a lot of problems with my new K40 laser and I have solved a lot of them. Unfortunatelly not all, so maybe some of you might help. I’ll try to give as much info about what is going on with my machine and add some of the pictures in the comments below to help visualise all.
First of all I’ve done some adjustments like removing the bed and making it my own with metal grid to allow a proper smoke flow from below the material.
I’ve got a 3D printed add on the head that holds 2 red beam lasers to point where the laser hits (using 2 so when both of them crosses in one spot at the right focus the co2 laser hits the corrects spot). Also it has an air assist.
Seems that all other additions should not affect the work of laser like light so I’m not gonna start on that.
Sudden Power Drop.
We were having a pretty poor power for a few days we were setting everything up, but didn’t actually know how powerfull it should be. Then we noticed one problem (listed below) and decided to check all mirrors realignment and found that the very first mirror was a bit off and realihned all of the mirrors once again and WOLA! A lot more powerfull beam. It all happened late night so today I got up, started the laser. First few cuts were made at 10mA 10mm/s and cut 1.5mm plexiglass (acrylic sort of) well, in one cut, all is fine and we are quite happy BUT… by checking the cut item we’ve noticed that the edge was not straight down vertical and the cut was quite fat so we’ve figured it must be due to focus. So we got the table down so now between the top of the plexiglass and the laser lens is about 58mm (as it should with this type of lens). We stayed with the same power and speed and it couldn’t cut through the crylic now. We boosted the power, lowered the speed and the same… We tried raising the material back up and whatever we do we can’t get through 1.5mm acrylic with any power or any speed even going twice. Triet cleaning lenses, checked the allignment (you never know when you’ve done something). Tried removing the head with pointing lasers and air assist and still the same… Checked the water temperature but it seems to be ok, 17 degrees C. Maybe somebody have had the same issue and might think of something that can be causing the problem? In the picture you can see the first ones to be cut properlly and then tone of others that failed to cut.
One more problem we have is if we cut acrylic there is a tiny laser beam spill and for example if we cut a star, there is an extra slight star to the top left of the original cut. The spill is really weak, but it is enough to melt very slight layer of the acrylic and ruin the piece we are trying to cut. We figured it might be solved by putting a papertape on top of the piece before cutting, but c’mon, these things should not be happening. And in the pictures with power drop you can see a lot of papertape to avoid this.
So at the moment the biggest problem is a sudden power loss and not figguring what the hell happened. Also all of the mirrors seems clean and without scraches so it doesn’t seem to be a problem.
If anyone of you might think of a problem I would be EXTREMELLY thankfull!