<div dir="auto">The amber ZnSe lens material eventually breaks down into Zn and Se, creating the dark spots. CO2 transmission optics are wear items, like brake pads. </div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Nov 18, 2019, 10:35 AM Joshua Pritt <<a href="mailto:ramgarden@gmail.com">ramgarden@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">Just an FYI we recently noticed a drop in power and had to turn up the power and lower the speed for cutting on the laser at Melbourne Makerspace. We did the one pass with qtips on the mirrors like mentioned above but it didn't help. We saw that the final lens in the system had a dark spot that wouldn't clean off so we removed it thinking it was dirty on the back side somehow. As soon as we removed it we could tell it was not something you could clean. We put a brand new lens in and now it is better than when we bought it! What normally took 70 to 80% power to cut all the way through now only needs 30%! So just a heads up on something else to check if you notice the power dropping on the cuts.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Nov 17, 2019, 8:38 PM Norm Marshall <<a href="mailto:normcooks@gmail.com" target="_blank" rel="noreferrer">normcooks@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">The laser has been working fine for me all day. If you would like some assistance in focusing it, I am happy to help<br><br><div data-smartmail="gmail_signature">Norm Marshall</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Nov 17, 2019, 6:04 PM Ryan Coons <<a href="mailto:ryancoonsyhg@gmail.com" rel="noreferrer noreferrer" target="_blank">ryancoonsyhg@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">DO NOT USE RUBBING ALCOHOL ON OPTICS.<div dir="auto"><br></div><div dir="auto">Propylnol can destroy the anti-reflective coatings and other treatments. Methanol (wood alcohol) should be used instead. Clear vinegar is acceptable for use on the ZnSe optics in CO2 laser systems.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Nov 17, 2019, 2:57 PM Wesley Swift <<a href="mailto:wesleyswift2@gmail.com" rel="noreferrer noreferrer noreferrer" target="_blank">wesleyswift2@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">I am fond of q-tips and rubbing alcohol. Shake off excess alcohol and make a pass on the glass. Don't rub. Use each end for one pass only and toss it or use to clean non optical parts. <div dir="auto">Microfiber is also great stuff but q-tips are better with liquids. Don't rub.<div dir="auto"><br></div><div dir="auto">Wes </div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Nov 16, 2019, 10:22 PM Bradley Marshall <<a href="mailto:sk8rbradley@gmail.com" rel="noreferrer noreferrer noreferrer noreferrer" target="_blank">sk8rbradley@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">For the laser at work we just use some vinegar and a qtip. They told me to specifically not wipe in circles as it is apparently bad for the lens.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Nov 16, 2019, 10:19 PM Joe Iacuzzo <<a href="mailto:joe.iacuzzo@gmail.com" rel="noreferrer noreferrer noreferrer noreferrer noreferrer" target="_blank">joe.iacuzzo@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Can anyone let me know how easy or difficult it is to clean the laser lens? When we went to use it I noticed that the fan on the laser was off. I turned it back on but the cuts weren't as clean as they have been. I believe that it may have allowed for residue buildup on the lens. I didn't want to mess with it unless I was certain I knew what I was doing.<div>Joe</div></div>
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