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Thread: Which way is your Focal Lens installed

  1. #16
    I've experimented with the lens in my Triumph both ways. While it does work better overall (like it should) rightside-up, I've found that I can cut 1/16" and 1/8" thick Rowmark using less power with the lens upside down, and the cut edge is cleaner than I've ever gotten from my LS900. Why, no clue...?
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  2. #17
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    OK, To add to the question, on an Epilog Helix, does the o'ring go above or below the lens ?

    This will affect the focal length.

    (Mine is below)

    Cheers,
    Chris
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  3. #18
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    If the O-ring holds the lens in, then whatever seems most appropriate to do that job...
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  4. #19
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    Oh!! Wow!! I have always thought it was the other way around? out to the laser I will go and have a fiddle!! I will let you know(eventually) which way I find is best, the proof of the pudding is in the eating! Amos Thanks for all the input to this thread,
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  5. #20
    This will affect the focal length.
    The focal length is defined by the curve on the lens, no matter where the lens is fitted the focal length will be the same BUT may move in relation to the material surface (depending how far away from the material the lens is at any given time)

    When switching lens's round to the right way up on a Chinese machine please be aware that China tends to machine a shoulder for the flat face on the lens to fit in, if you swap the lens round you will be tightening it up onto a sharp corner and risk cracking it. Fitting the lens convex down makes the beam more scattered, this can give the impression it is cutting better when in reality it is just a fatter spot with a deeper (effective) depth of field due to the scattering. Power density will drop as well.

    cheers

    Dave
    Last edited by Dave Sheldrake; 02-18-2014 at 9:01 AM.
    You did what !

  6. I have an epilog mini 24 35W. The original lens are plano-convex 19mm FL 2". And now I have to replace the lens. Can anyone guide me if a meniscus lens produces the same, better worse results? Thank you.

  7. #22
    better results usually
    You did what !

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