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Thread: Just tried moly spray!

  1. #16
    What I was hoping to see was some results with aluminum and brass where I have had no success with Cermark. I did buy a can of the moly from Grainger several days ago but haven't had time to give it a test but it is not to replace Cermark--only to try on chrome, brass and aluminum.
    Mike Null

    St. Louis Laser, Inc.

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  2. #17
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    Send pictures when you have completed your test ... I believe we have been down this alley before. LOL..


    http://www.evilmadscientist.com/2013/laser-moly/

    http://imajeenyus.com/workshop/20130...ng/index.shtml...


    Brass and Aluminum ????
    Last edited by Mark Sipes; 07-23-2014 at 3:52 PM.
    Mark
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  3. #18
    I engraved rhodium plated Brass using a dry moly.
    Rhodium is as hard as anything. Tried it with Cermark, and was incredibly dissapointed.
    But had great success with dry moly. Researched both rhodium and Brass heavily, all responses were pretty conclusive. Cermark will not work with either of these metals.

    I actually won this job over two local competitors, both of which did a sample using a rotary and diamond drag engraver.
    I managed to achieve some depth surprisingly, can feel it when you run your fingers over it, not to mention great contrast. Leaves like a matte black finish over an incredibly glossy metal. Couldn't of been happier. Only challenge I had was removing the excess dry moly from the award, had to use methyl ethyl ketone or MEK as a DNA or hot water wouldn't work. Even then it was tough going, and not scratching the rhodium was definitely a challenge.

    But well worth it for the $$$$ on this job.


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  4. #19
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    Cool looking award, Mitchell...
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  5. #20
    They are incredibly cool.
    helpmann_2131_jl.jpg
    We don't make them, we create the bases, the extra piece to sit on top, and engrave the center piece.

    The man designing them told me the center piece costs him $350 dollars after he has them rhodium plated, I'd hate to even imagine what the finished award is worth.
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  6. #21
    I have not tried any faster than 200mm. But I will. That is just what I tested it at. When I get a little more time I'll try faster speeds. The fastest my machine can go anyways is 400mm a sec.

  7. #22
    Mitchell

    Thanks for posting that. Very nice work but MEK? I hope I can find something other than that. Did you try acetone?
    Mike Null

    St. Louis Laser, Inc.

    Trotec Speedy 300, 80 watt
    Gravograph IS400
    Woodworking shop CLTT and Laser Sublimation
    Dye Sublimation
    CorelDraw X5, X7

  8. #23
    I ran my first test of dry moly today. I applied it to nickel plated brass. I got the faintest image at full power and half the speed of Cermark. It was not at all acceptable. It is the dirtiest material I have yet to use--wear rubber gloves. I was able to clean it with isopropyl alcohol rather than using the harsher chemicals previously mentioned. It is messy to spray and messy to clean and I believe not at all economical.

    I took two cell phone pictures but neither were good enough to post.. The surface was too glossy and the image too faint.

    I am running at low power and have to recharge my tube so that may well have been the cause of my poor result but I can still run Cermark jobs on stainless steel.
    Mike Null

    St. Louis Laser, Inc.

    Trotec Speedy 300, 80 watt
    Gravograph IS400
    Woodworking shop CLTT and Laser Sublimation
    Dye Sublimation
    CorelDraw X5, X7

  9. #24
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    Looking at Grainger's web site, they also offer Sprayon Dry Molly (LU200) for $9.22 however the technical specs states the color is clear. So, not sure if this is the same or if it will work. Maybe the specs are incorrect.
    There is a discrepancy in their technical specs and the headline - headline states 11 oz. but specs states 16 oz. The photo of the can has 11 oz. on the can so I would bet on that amount.
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  10. #25
    I paid about $30 for the can. I bought this variety because it specified black. That may not have been important but I thought it may present a darker image.

    The brand is LPS Force 842.
    Mike Null

    St. Louis Laser, Inc.

    Trotec Speedy 300, 80 watt
    Gravograph IS400
    Woodworking shop CLTT and Laser Sublimation
    Dye Sublimation
    CorelDraw X5, X7

  11. #26
    I have a 1 lb. can of dry moly paste and a can of moly spray coming from amazon. I have a couple dozen large SS operator panels that I'm putting on hold just to see if this stuff works.
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  12. #27
    You know I used Moly for years when I built the compressors for J-85 engines....we would spray the blade dovetails then put them in an oven for as much as 15 mins @ 350 I think....been a long time. The coating would last a long time!!!!! What an interesting use. I wonder how well it would laser if you just applied one layer, baked it then lasered it......

    Bryan

  13. #28
    I've got a can of moly and I've tried several different items and just couldn't get it to work correctly. I'm using a 45w FSL machine. Can someone give me some general power/speed settings to try again? I usually sell quite a bit of flasks and would love to do them on the laser so the imprint will be black vs. sandblasted. Thanks for all the help!

  14. #29
    I just did a bunch of flasks for a camping trip using moly spray.

    My settings were 400mm/s with 35% power on an 80W RECI tube.

    Here is a picture of the outcome. Not Jet black, but pretty nice. I tried to remove one of the test samples with industrial scotchbrite and it just started to come off with a couple minutes of scrubbing. It also looks like there was some etching into metal.

    flask.jpg

    Paul

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