MK2 Laser appears to have melted G2 lens

Add-ons & Modifications šŸ”„ Laser
1

Hello and just tried my laser for the first time. Followed all of the online instructions and watched the Sienci video several times to make sure I did it right. After one successful 3x5 inch burn, which was a small line picture at 80% dip switch using Lightburn then gSender that took 5 minutes, I found what appears to be a melted spot on the center of the lens. What did I do wrong? I was at the correct Z height and the lens was inserted correctly so any ideas? I also have a 3E lens but found the online documentation different than the video regarding which end goes into the ring - they are opposite but have not tried to see which is which. thanks

2

@CMonastra What material did you burn the picture on? Could what you are seeing on the lens be some of that material?

3

Cherry and only used 1 pass and had the 255 setting as recommend. Speed was 24.5 based on the video. I will check if something on lens but never took it out between the first ā€˜goodā€™ burn and the second where I couldnā€™t focus. Here is picture of lens sitting on light colored pine showing the spot. Very odd and burning right now with 3E and no issues so far. thanks
G2

4

@CMonastra I would take a swab with some alcohol to see if you can get that off. I am interested in how you make out as I will be amazed if a diode laser can melt glass. It cannot etch glass unless you paint the glass since the laser simply passes through the glass. I canā€™t see that being any different with a lens. That said, I have no expertise in that area at all.

1 Like
5

Tried alcohol on a Qtip on both sides but still have the dot. I opened a support ticket with Sienci and will post what they come back with. Could be an imperfection or maybe a scratch on the lens but not sure how that would have occurred. I did have the lens screwed in all the way to the laser but not tight. We will see and did order a replacement plus the 4 lens set to boot. thanks

6

Replied to your support ticket, weā€™ll chat soon and fix this.
Cheers,

7

Hello and Sienci said to clean our lens before use which does make sense. They were very helpful with this matter. Said this is a rare occurrence but ā€œcleaning the lens with isopropyl alcohol before use is always good maintenanceā€. Thanks and just sharing. Nice work and quick response Sienci Support!