Do you use a special lens for such long focus work? I don't think my machine has the depth-of-field required for engraving across more than a few mm deviation in the Z direction.
We aren't using a special lens. It works but only within a certain range. The ideal laser focus, on our machine, is only about 3mm from the lens body. The handle posts necessitate moving the laser head farther away, to around 11mm. So, we move the laser head as close as possible without hitting those posts. We don't bend the posts for fear of damaging them.
This tool helps level the cup edges the best we can. My wife makes between 25 and 100 of these cups a month and this tool really helped her. We were using a digital level and having to create a design of the cup edge and figure out the angle for each brand and size. This gets rid of that complexity.
The laser is out of focus for the majority of the burn but it's in a range that allows it to work well on powder coated tumblers.
Specifically, we use a Creality Falcon 2 Diode 22W laser for tumblers. It's not, however, the machine I would recommend to others, for a number of reasons.
Very interesting comment, ok I will abstract and put this in the engraving section, is there a set of materials and/or colors that you find work better and others that really do not?
