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  1. #1
    Registered
    Join Date
    Aug 2006
    Posts
    20

    Focus distance of Chinese laser lens and other quirks

    Hi there,

    I recently bought a Chinese K40-III laser cutter and I'm still debating with two difficulties.

    I don't know the focus distance of the lens, it's a 12 mm lens but when I asked the seller about the focus distance the seller didn't even knew what I was talking about! Is there a simple way to find the focus distance?

    I have th machine cutting almost perfectly, the two quirks I have still is that the machine cuts perfectly in a box of 10 cm x 10 cm from home point but beyond that it needs more power to cut through, is there a way to correct this (mirror alignment is perfect and I clean them every day)?
    Second is the debris, this might be normal in a machine like this, I built air assist and a honeycomb table but most of the ashes remain in the material, is there a way to optimize this (get rid of the burnt wood/card)?

    Thanks in advance

  2. #2
    Registered
    Join Date
    Nov 2008
    Posts
    382

    Re: Focus distance of Chinese laser lens and other quirks

    hi there
    first make the ramp test ( put a strip of wood across the table then raise the right side about 6mm up then cut a straight line with 25% power and 10 mm speed then look where the line is the thinnest measure on this point the distance from the material to you laser head , that's the focal distance what you always need to hold)
    second the airassist stream must blow in the cut.
    greeting
    waltfl

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