@Zax Well the laser and the software did all the hard work
Posts made by AndyJS
RE: Focusing tip
Just to add 'Focus' makes all the difference in the world. Wood is reasonably forgiving (except when going for detail in greyscale) but anodized aluminium or mirrors for example can simply not engrave at all if the focus isn't sharp enough.
Anybody else have any focusing tips to share?
If like me you have trouble focusing your laser I would like to share a tip which works for me.
I bought some black aluminium business cards (not anodized just thin black plastic coated ones sold in packs of 50 from Amazon). I place one of these on top of whatever material I want to engrave, set the laser override power to 5% in t2, put on my goggles, activate the laser and adjust the lens focus in small increments until the blue dot starts to turn red and starts burning off the plastic coating on the business card. That usually results in a very fine focus and is good to go.
Hope this helps somebody.
RE: Acrylic mirror sheet.
If I find a sacrificial glass mirror I'll see I can get similar results (wont be long before I break one with my ugly mug lol).
It could just be that these particular acrylic ones have a very thin backing that's much easier to burn through.
RE: Acrylic mirror sheet.
These are acrylic mirror tiles fresh from Amazon (note they are not glass).
All I did was focus the laser on some 3mm birch ply, lay a sheet of plain A4 white paper on top of that and then lay the mirror tile face down on top of the paper (the plan being that the beam would be focused straight through the mirror tile and onto the white A4). Then I just engraved a flipped image onto the back using a feed rate of 1500, power 255 and resolution of 0.2 (It was initially going to be a quick test so detail wasn't important hence the resolution but came out well enough that I will probably use that in future on these tiles).
With a 5watt laser on my eleksmaker A3 pro when engraving 3mm baltic birch ply I use 2500 feed rate, rapid feed rate 6000 (not sure this makes any difference), laser power max 255, min 0 and scan res 0.1
Depending on the focus I get very good results with these settings if that's of any help to you.
Laser focus is the real key and you need to spend some time to get it as sharp as you possibly can (I ended up raising the laser module pretty much as high as I could get it and then using an adjustable lift platform to place the engraving material on in order to make focusing a little easier).
Spend the time on the focus and you 'should' get decent results.
RE: Laser fire at power on is now flashes?
If it's any help I used a 1k5 resisitor and that solved the dangerous pre burn issue for me.
I initially tested prior to soldering to the underside of the control board by stuffing it between the yellow and black cables on the connector for the laser control board.