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Thread: Groove not right.

  1. #1
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    Groove not right.

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    This keeps happening on our Alta-NX edger. looks like the groover is slipping off the lens and back on. has anyone else experienced this? We've tried a few things to fix this, like replacing the grooving tool and fiddling with the placement. but it keeps happening, seemingly at random. but always with trivex lenses.

  2. #2
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    We have an Essilor edger and the only time something like this happened was when we tried edging and didn't select the correct material. That and when our edger decided to go kaput.

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    It may be that your groove is a bit too far forward and is coming unstuck with the polarising layer of the lens. where they are joined, it may be weaker and grooving is not as stable there?
    It’s so simple to be wise. Just think of something stupid to say and then don’t say it.

  4. #4
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    Quote Originally Posted by IC-UC View Post
    It may be that your groove is a bit too far forward and is coming unstuck with the polarising layer of the lens. where they are joined, it may be weaker and grooving is not as stable there?
    that makes sense, but the problem with that is it happens to non polar lenses too.

  5. #5
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    the groove looks awful deep to me.

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    OptiBoardaholic Randle Tibbs, ABOM's Avatar
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    Check your depth and angle (that is if you can adjust the cutter angle)

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    Quote Originally Posted by Randle Tibbs, ABOM View Post
    Check your depth and angle (that is if you can adjust the cutter angle)
    off the top of my head i believe the depth is 0.5 or 0.6

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    Quote Originally Posted by Dooky Shoes View Post
    that makes sense, but the problem with that is it happens to non polar lenses too.
    Is it in same position all the time? Could it be the tracer? Unsure of edger you have, but could it be rotating and bumping something in the machine?
    It’s so simple to be wise. Just think of something stupid to say and then don’t say it.

  9. #9
    Master OptiBoarder OptiBoard Silver Supporter lensmanmd's Avatar
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    There may be several settings auto, front and user defined. Make sure all settings are calibrated. Looks like the default is set at front, and the calibration is off.
    I bend light. That is what I do.

  10. #10
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    Does your edger have a lens measuring unit (LMU) that measures the uncut prior to edging and gives an estimate of the edge thickness and base curve? On our santinelle edger the LMU is usually what needs to be calibrated when groove position is off...it can get lens debris build up overtime that can affect the accuracy if not cleaned regularly.

    I'd suggest a good cleaning and full calibration. I'd even pop the hood and make sure the internal components are clean and lubricated.

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