GEdward wrote:Great job! Well executed. I have two questions. First, you mention that you didn't have to machine a flat area for the top piece so I have to wonder how much can you get away with within the focal range of the laser? It looks to me that you had at least .200" of deviation overall. And second, I assume this will be used outdoors so what will you use to preserve the finished product from the elements?
OK, three questions, what brand and power is you laser?
1. I have a 3 element lens in the laser, which has a long focal length and low divergence, at the expense of only being 70% efficient. It has a 0.1mm (0.004") focused point, which coupled with low divergence, meant that with the relatively large detail it was able to maintain enough focus to do the engraving without distorting the text/image.
It was actually over .5" of deviation. I set the zero in the middle of that, so it only had a .25" deviation in either Z direction.
2. The whole project was sprayed with several coats of General Finishes Exterior 450. You can see in the last picture it's glossier than the previous ones.
3. The laser is from Endurance lasers. It's their 10W laser (6W diode, overpowered to 10W with additional cooling). I've actually modified/customized it a bit to better suit my application and am running it at 12W. For this engraving it was running at 20% output @ 60 IPM.