Chinese Laser not cutting

[Bert Kemp]

Junior Just buy a 2" or 2.5" focal length lens, measure the Dia with a ruler or calibers if you have them , 2 2.5 is a good all around lens,

[John Noell]

Rob, there are two modes, vector (for cutting - where the laser follows a line) and engraving (called "scan" in your software - where the laser goes back and forth like an inkjet printer). For either mode to be effective, your laser beam needs to be carefully aligned so it hits the center of the mirrors and the center of the focusing lens. You must keep the lens a pretty exact distance above the material you are cutting or engraving so the beam stays in focus. If you do not have a guide to show you the proper distance, there are posts here that show you how to determine the correct distance, so you can make a guide for yourself.

[Ray Scott]

I recommend a 50.8mm lens or 63.5mm lens. Go for the premium quality version. It will cost more.. Buy from a reputable seller.

The lens could have been damaged by you. The lens often has some oil on it .., If it was already installed when shipped direct from China. Cold temperature optics and hot air can cause humidity to condense onto the lens.

If you aren't adept to laser machines, it is a good idea to try and keep your eyes open for anything that could go wrong.

thank you,