Results 1 to 7 of 7

Thread: Laser focus lense damage

  1. #1
    Join Date
    Sep 2011
    Location
    Derbyshire. United Kingdom
    Posts
    11

    Laser focus lense damage

    HI all,
    This is my first post here and its a query about what has damaged the 2" focusing lense on my works trotec speed 300 80W laser engrave.

    there is a "star" shape crack in the lense, which i suspect could be from someone not setting the focus depth correctly

    below is a photo any ideas?[IMG]file:///C:/DOCUME~1/b2431/LOCALS~1/Temp/msohtmlclip1/01/clip_image001.jpg[/IMG]

  2. #2
    Join Date
    Oct 2004
    Location
    Cape Town, South Africa
    Posts
    3,922
    No pic in the post , but damaged lenses are normally due to a build up of dirt/moisture/oil which either mess the coating or burn/overheat the lens.
    If you have air assist which blows thru or includes the lens box, your compressor can be the problem , re moisture or oil.
    It could also be mechanical damage , like the lens dropped etc.
    Wrong focus depth would be unlikely to cause the damage unless the head containing the lens hit something?
    Rodney Gold, Toker Bros trophies, Cape Town , South Africa :
    Roland 2300 rotary . 3 x ISEL's ..1m x 500mm CnC .
    Tekcel 1200x2400 router , 900 x 600 60w Shenui laser , 1200 x 800 80w Reci tube Shenhui Laser
    6 x longtai lasers 400x600 60w , 1 x longtai 20w fiber
    2x Gravo manual engravers , Roland 540 large format printer/cutter. CLTT setup
    1600mm hot and cold laminator , 3x Dopag resin dispensers , sandblasting setup, acid etcher

  3. #3
    Join Date
    May 2007
    Location
    Marquette, Michigan USA
    Posts
    41
    I cracked my first lens from dirt buildup on the bottom of the lens, caused by having the air assist running too strong and creating a venturi effect. The dust and fumes were actually pulled up onto the lens. Trotec recommends adjusting the compressor by loosening the locking nut and turning the adjustment valve stem clockwise (closing) until you feel resistance. This should be the closed position without forcing the valve seat. Mark the adjusting knob on the top. Re-open the valve counter clockwise three turns. Reset the locking nut. Done. While this is only a starting position, I found it to be a good setting. Often, I'll have to increase volume depending on the material flare-up, but I've learned to check the lens often.

    Hope this helps,
    Art
    Trotec Speedy 300, 45 w.

  4. #4
    Art offered the exact comment I was going to make. (my lens is now 6 1/2 years old and I use the machine every day.)

    Check your lens every day--if it shows any sign of dirt clean it.

    Being out of focus did not cause your problem.

    Trotec tech support will send you the memo though Art has it right.

    PS Welcome to SMC. Please reduce the type size to make reading easier.
    Mike Null

    St. Louis Laser, Inc.

    Trotec Speedy 300, 80 watt
    Woodworking shop CLTT and Laser Sublimation
    Evolis Card Printer
    CorelDraw X5

  5. #5
    Join Date
    Sep 2011
    Location
    Derbyshire. United Kingdom
    Posts
    11
    Thank you for the replys, ill look at the air assit the next time I am at work.
    The problem is more than one person is authorised to use it and they don`t always clean it.
    Sorry about no picture,when i posted the message the icon didnt appear so ive attached it to this reply
    P1260004.JPG

  6. #6
    Join Date
    May 2007
    Location
    Marquette, Michigan USA
    Posts
    41
    Yup.... I know that look....sadly said the credit card....

  7. #7
    Join Date
    Sep 2011
    Location
    Derbyshire. United Kingdom
    Posts
    11
    Luckly it the company I work fors engraver, but its going to take two weeks for the replacement to come from Austria.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •