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3991

Veeco EP-2A Diffusion Pump question

Just received a Veeco EP-2A with a small amount of damage to the jet stack. There's something wrong with how the top jet cap should be attached. I have photos
wa6ejo
Mar 13
#3991
 
3990

Re: weird Sharpie residue

It was easy to remove the sharpie before we Aluminized it. We purposely decided to do a Quick and Dirty aluminizing insatiable. I didn't consider the fact that
Guy Brandenburg
Mar 8
#3990
 
3989

Re: weird Sharpie residue

Sorry. It of course passed the laser test. Sent from my iPhone
Guy Brandenburg
Mar 8
#3989
 
3988

Re: weird Sharpie residue

I asked about the laser pointer test 12 days ago. Christopher Erickson Consulting Engineer Summit Kinetics Waikoloa, HI 96738 www.summitkinetics.com ... From:
Christopher Erickson
Mar 8
#3988
 
3987

Re: weird Sharpie residue

... Good call Drew, I wonder if the mirror passed the laser pointer test? ( http://stellafane.org/tm/atm/test/quality.html#polish ) -- Kirk Wallace
Kirk Wallace
Mar 7
#3987
 
3986

Re: Pix of sharpie watermark

Could be, Drew. I hadn't considered the heat of the aluminum at all. Won't make that mistake again. Sent from my iPhone
Guy Brandenburg
Feb 24
#3986
 
3985

Re: Pix of sharpie watermark [5 Attachments]

And you said this happened after you aluminized with the shaprie marker on the glass ??? I can only guess that the 2000 deg F aluminum gas flashed the dye and
    Andrew Aurigema
    Feb 24
    #3985
    This message has attachments
    3984

    Pix of sharpie watermark

    Here are some. First few after acetone. Last ones after paint strip per. Absolutely cannot see this on ronchi gram or Foucault Sent from my iPhone
    Guy Brandenburg
    Feb 24
    #3984
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    3983

    Re: weird Sharpie residue

    Could still be micro-fractures. One thing I do is use a 3-5mw green laser pointer. I hit the mirror at an angle and if I can see a green dot on the surface of
    Christopher Erickson
    Feb 23
    #3983
     
    3982

    Re: weird Sharpie residue

    1. You cannot see the marks at all with the naked eye. AT ALL. 2.  I believe the mirror is fully polished.  3. The only way I can tell something weird is
    Guy Brandenburg
    Feb 23
    #3982
     
    3981

    Re: weird Sharpie residue

    Agreed. If the marker isn't coming off then the mirror polishing isn't finished. Christopher Erickson Consulting Engineer Summit Kinetics Waikoloa, HI 96738
    Christopher Erickson
    Feb 23
    #3981
     
    3980

    Re: weird Sharpie residue

    The only time Sharpie marker dont come off a mirror I am working on is when the mirror is not fully polished out. Even a mirror that looks polished can still
    Andrew Aurigema
    Feb 23
    #3980
     
    3979

    Re: weird Sharpie residue

    That's also weird. In the past I found that "permanent" magic markers or sharpies came off of glass -- Pyrex or float -- in soap and water or even with
    Guy Brandenburg
    Feb 23
    #3979
     
    3978

    Re: weird Sharpie residue

    A person who uses a permanent marker on a surface, no matter how precious, ought to expect it to be permanent. Sadly. Brian Whatcott On 2/21/2015 10:43 AM, Guy
    brian whatcott
    Feb 23
    #3978
     
    3977

    Re: weird Sharpie residue

    It was a permanent marker. I Sent from my iPhone ... It was a permanent marker. I Sent from my iPhone On Feb 23, 2015, at 9:34 AM, Don Mattox donmattox@...
    Guy Brandenburg
    Feb 23
    #3977
     
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