Has anyone upgraded to copper (or other) mirrors

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Gene Uselman
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Re: Has anyone upgraded to copper (or other) mirrors

Postby Gene Uselman » Sat Aug 13, 2016 5:08 am

I have a good customer (another old phart) who sells copper head gaskets to the big drag racers- I asked him if he had any drops and he invited me to come in and take what I wanted. But... he is a whole mile down the road and I am very busy for a retired guy. Maybe this winter when things slow down. Gene
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Preben Hovedskou
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Re: Has anyone upgraded to copper (or other) mirrors

Postby Preben Hovedskou » Fri Aug 19, 2016 1:40 pm

Hello freinds..

Copper mirrors is the best you can get.
Off cause you can make them yourself like Russ did to save some money, but it's quite a job.. :D
I just chosed to buy mine from Ebay and payed the price.. But it's value for money.! You will feel a great emprovement in cutting power.
They are easy to clean, and because they are made of solid copper they will last forever.! Other types of mirrors (fx silicium) only have a very thin layer of the reflective material, and this layer can be worn or damaged if you have to do some rough cleanings.

All industrial lasers uses copper mirrors, and for sure there is a reason for that..

-Preben-
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fred ungewitter
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Re: Has anyone upgraded to copper (or other) mirrors

Postby fred ungewitter » Sat Aug 20, 2016 4:32 pm

How does one make one's own copper mirrors? I would first guess copper rod of the proper diameter, sliced carefully, perhaps milled ends, then equally carefully polished? Polish both sides for the ability to flip it over and use the other side, but why would that be necessary?
fred

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Keith Sherwin
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Re: Has anyone upgraded to copper (or other) mirrors

Postby Keith Sherwin » Tue Aug 23, 2016 3:28 pm

I would think Tarnishing might be a factor, but Pepsi would be the one with knowledge to answer that question.
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Keith Sherwin
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Re: Has anyone upgraded to copper (or other) mirrors

Postby Keith Sherwin » Tue Aug 23, 2016 10:00 pm

Good job!! Only thing I would suggest is to insulate the HV wire where it is rubbing on the case, where you nipped it. Take a bit of neoprene hose about 2" long, slice lengthwise and put over the wire in case of chaffing. Nice big mill in the background.
69 Real (80)Watt Laser w/multi FL lenses. T.L.
Made 5 CNC's, Electronics, Electrical, PLC & Computer background.
:idea: Started this forum - Using RDWorks V8.01.21 on W7 Pro
Lead in creation of the RDWorksLab English Manual.
Crazy Uncle Keith!

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Preben Hovedskou
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Re: Has anyone upgraded to copper (or other) mirrors

Postby Preben Hovedskou » Wed Aug 24, 2016 11:23 am

Silver is for sure a slighter better reflector than copper, but the material is not so practical to use as mirrors in our small machines.
Like Keith says, it will turn dark because of the ozone and hydrogen sulfide in the atmospheric air.
Also the price is a problem, 99.9% pure silver is quite expensive.!
Most of the silver we use for jewelery etc. is an alloy containing a mix of other metals, mostly copper ;-)
Pure silver is quite soft, (hardness=2,7 Mohs) and it will be difficult to maintain a high polished surface.
It has a lower meltingpoint than copper, and the power from a laser can actually make minor changes in the surface, which will destroy the bennefit from using the material in our mirrors. So for us, copper is the best we can get. ;-)

BUT.. of cause silver mirrors exist for use in lasers.
They have a very special coating to prevent oxydation, and they only contain a thin layer of silver on top of another metal.
You can go buy them for a test, but I think the project will turn out too expensive regarding the small improvement to copper.
Making them yourself or by the local silversmith is for sure not value for money.

But if anyone will give it a try, I'm very interested to follow the project.

https://www.thorlabs.de/newgrouppage9.c ... oup_id=903

Happy lasing..

-Preben-
-Pepsi-
50W KH5030 TL (blue/white)
RDworks 8.01.19 Win10
Qcad (qcad.org)
15 years experience as service-technician for industrial lasers.
( http://www.bystronic.com )

Trevor Johansen Aase
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Re: Has anyone upgraded to copper (or other) mirrors

Postby Trevor Johansen Aase » Sat Dec 03, 2016 3:16 pm

Can you post a link or search string to the copper mirrors on eBay?
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Jason Wright
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Re: Has anyone upgraded to copper (or other) mirrors

Postby Jason Wright » Sat Dec 03, 2016 3:44 pm

Chinese 700x500 80 watt machine - TR
Mods: custom air assist off a workshop compressor, ammeter installed, switch panel, overnight internal tube heater

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Trevor Johansen Aase
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Re: Has anyone upgraded to copper (or other) mirrors

Postby Trevor Johansen Aase » Sat Dec 03, 2016 5:46 pm

Bingo. No idea why I got a fat nothing in my searches or "Copper Mirror"

Anybody use a "1 oz Pure Copper Round Coin" and polish it themselves? I have diamond stones and polishing sheets to 1um and I can get the coins for $1, and the 5oz slugs (better heat resistance?)

Thanks.
Machine
  • 40W K40 Analog Dial Style Machine.
  • DRV8825 Stepper drivers with GRBL v1.1 on Arduini Uno.
  • Redi-rod adjustable bed on aluminum vent grating table.
  • 255mm x 300mm with T.L. home.
  • Sketchup => Corel Draw x6 => Visicut (linux)
Trevor JA

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fred ungewitter
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Re: Has anyone upgraded to copper (or other) mirrors

Postby fred ungewitter » Sat Dec 03, 2016 6:00 pm

Russ has a video of a project similar to that you describe, Trevor. It seemed promising until about a month later, when he presented his test results showing a marked reduction in power at the nozzle. As Russ described it, his mirror polishing created non-flat surfaces, likely concave, causing excessive beam divergence on the way to the nozzle.

Last night, I attended an astronomy event at the local public library, put on by the faculty advisor to the university's astronomy club. To my great disappointment, he and his assistant were not makers and had no experience with constructing telescopes.

I was hoping to learn how one could create a perfectly flat surface at the laser's wavelength and additionally to confirm with some form of test that the surfaces were flat. There is a science of interferometry which does just that, but I'm not certain it's an "in-the-home" sort of activity.

Thanks to Russ' video, I've learned just how fine a surface finish one can extract with Micromesh at 32000 grit levels!
fred

Redsail clone 60w 700 x 500 REAL 60w Puri tube
home upper right, chuck type rotary 15000 pulse setting
RDW 8.01.18
Win7

Emblaser A3 4w diode laser
BCN3D Sigma Dual Extruder 3d printer
LMS Mini-mill
Cube 3rd gen 3d printer, universal filament mod
Under construction: OX CNC 1000x750 router


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