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Thread: Lap compensation question

  1. #1
    Bad address email on file Rich R's Avatar
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    Lap compensation question

    I'm in the process of grinding some new laps for the lab, being somewhat an old timer, I used to check the lap curves using the brass gauges, just made sure there was a bit of light at the edges when checking them. However now I'm using a sag gauge and compensating about a .06d for pad compensation, thus making a 6.00d lap around 6.06, my question is if this a correct compensation for all tool curves or should I compensate more on higher laps and less on flatter ones.
    Thanks for any help on this.
    Rich R

  2. #2
    Forever Liz's Dad Steve Machol's Avatar
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    Rich,

    I've written a Lab Calculator program that's available from the OptiBoard Download section. It includes a section on Pad Compensation. It also includes the original source code so you can see the formulas for yourself. Here's a direct link to the download. You'll need to unzip it first.

    http://www.optiboard.com/files/labcalc.zip


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  3. #3
    Bad address email on file Rich R's Avatar
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    Thanks Steve, this was exactly what I was looking for.
    Rich R

  4. #4
    Forever Liz's Dad Steve Machol's Avatar
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    No problem. I'm glad to see someone actually use this! :D


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  5. #5
    sub specie aeternitatis Pete Hanlin's Avatar
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    Another good program (albeit, not applicable to this particular problem) is "OpticsLite," by our very own Darryl Meister. If I am not mistaken, it is available in the download section of OptiBoard.

    Someone was showing me this disc from SOLA just the other day and it had "OpticsLite" on it... If you ever want to know about how thick a lens will be in various indices, or what aberrations to expect at various points in the lens, this program is a godsend.
    Pete Hanlin, ABOM
    Vice President Professional Services
    Essilor of America

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

  6. #6
    Forever Liz's Dad Steve Machol's Avatar
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    Yep, OpticsLite is great! Here's the direct link to it:

    http://www.optiboard.com/files/opticslite.exe


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