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Thread: Freakin' hash marks

  1. #1
    Independent Problem Optiholic edKENdance's Avatar
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    Freakin' hash marks

    Why oh why do they have to put those hashmarks on unfinished polarized blanks? FPD 75, 75mm blank, 9mm inset, cross your fingers. Why can't they just be inked like progressives and what's the deal with mirrored coatings on blanks? Why can't they encompass the entire surface?
    I lose a day in my life everytime a lens comes out of the edger with an imperfection at the temple.

  2. #2
    OptiBoard Professional Robert Wagner's Avatar
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    Angry Hash marks

    Couldn't agree with you more! I have often wondered about this myself.

    Robert
    ;)
    There are many things in life that catch your eye... but very few things will catch your heart.... Pursue those!

  3. #3
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    That is a problem that can usually be solved with some prism groud for decentration. SV of course :0). The old prentice rule applies.

    shutterbug

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    Master OptiBoarder OptiBoard Silver Supporter Jubilee's Avatar
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    I have done that a few times...

    The problem is when you are running a one hour lab, and retail doesn't take proper measurements or the calc program doesn't leave you much room for error or hash marks. By the time the problem is noticed, the lens is already cut...

    When it is a close call, what I will do is outline the mark with china marker, and double check the cut out. If it won't make it, then I will normally see if I can get it to cut out if I use some of my tolerance. (Move it over a mm, or give .25 horizontal which ever gives you better clearance)

    Cassandra

    PS..Not sure if you use KBco or Vision Ease, but I have noticed the newer KBco lenses have a 0/180 line inked on....
    "Some believe in destiny, and some believe in fate. But I believe that happiness is something we create."-Something More by Sugarland

  5. #5
    Independent Problem Optiholic edKENdance's Avatar
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    We use the VE single vision blanks. It would be nicer if they were available in larger then 75 mm. We only stock bi's in KBco and I really prefer the colour to our grey and brown. I hope one day that we get the inked SV's.

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    Master OptiBoarder OptiBoard Silver Supporter Jubilee's Avatar
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    polarized stock

    how weird.. though you are in Canada...

    My mix is the exact opposite.. KBco for SV and Vision Ease for bi and progressive...

    Not sure why I posted that.. .but it just struck me as being ...odd :)

    Cassie

  7. #7
    Bad address email on file Rich R's Avatar
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    I also notice the calc program does not give enough decentration, for instance if you need to go 8mm in and the program figures you can get that with no surface decentration, it does not think about the hash marks.
    If you're using the sgx you can edit the A dec. for horizontal, I usually go half the total, so for 8mm, I'll input 4 to help the lens cutout at finishing.
    Rich R.

  8. #8
    Independent Problem Optiholic edKENdance's Avatar
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    The best solution I found is to just block the lens at the 90 instead of the 180. :)

  9. #9
    sub specie aeternitatis Pete Hanlin's Avatar
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    Just an FYI... Essilor will soon be launching polarized SFSV in polycarbonate. The lenses will have circular engravings on the 180 line 34mm apart (just like PAL markings, except all you will see is two circles).
    Pete Hanlin, ABOM
    Vice President Professional Services
    Essilor of America

    http://linkedin.com/in/pete-hanlin-72a3a74

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    edKENdance - I couldn't tell if your post was tongue-in-cheek or not, but if not ......

    You can't block them 90 off. The polarization will be wrong, and will negate the reason for polarization. That's why those irritating little marks are in there - so you can block them correctly. :D

    shutterbug

  11. #11
    Independent Problem Optiholic edKENdance's Avatar
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    Shutterbug, of course it was tongue in cheek, hence the little icon.
    I thought you folks would know my off-kilter(er, axis) sense of humour by now.

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    ed -

    Whew! That's a relief LOL.

    I was afraid someone would read the post and say "Hey, that's a great idea!"

    :hammer:

    shutterbug

  13. #13
    Independent Problem Optiholic edKENdance's Avatar
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    One of the reasons it wasn't posted on the main board.

  14. #14
    Independent Problem Optiholic edKENdance's Avatar
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    OK, so we did a little thinking at work. We are now decentering those troubling jobs on our SGX. We shift the A by 2mm and it seems to have solved the problem.

  15. #15
    RETIRED JRS's Avatar
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    It is possible, depending on the software (calc) program you are using - to set a "useable" diameter in the system. It will then give you better warnings on close calls and/or grind a bit more prism for decentration. Read through your software manual to see if this is a viable option.
    J. R. Smith


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