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Thread: Can engrave but not pulse the laser

  1. #1
    Join Date
    Jul 2014
    Location
    Central FL
    Posts
    19

    Can engrave but not pulse the laser

    I am new to this hobby and purchased a used Sh-g350 laser enngraver. The mirrors need alignment but the laser button on the control panel does not fire the laser. I get the beep when the button is pressed, and I see a brief flash in the laser tube, but no laser output. If i start a cut or engrave job, however, the laser works, it's just out of alignment. I can't really align it without having the pulse. Has anyone here seen this issue or have suggestions?
    Thanks

  2. #2
    Shawn

    Welcome to SMC. If you have checked out this thread I suggest you do so as it may answer questions for you.

    http://www.sawmillcreek.org/showthre...-tricks-thread
    Mike Null

    St. Louis Laser, Inc.

    Trotec Speedy 300, 80 watt
    Gravograph IS400
    Woodworking shop CLTT and Laser Sublimation
    Dye Sublimation
    CorelDraw X5, X7

  3. #3
    Join Date
    Jun 2011
    Location
    Mount Gilead, Ohio
    Posts
    121
    Shawn,
    When you run the program for the engraving it sets the power but from the panel you need to set it manually, mine needs to be at least 12% to fire the laser, this is typical.

    Of course that may not be youe problem but it's easy to check.

    Ken
    ExLas 130 Watt Reci
    1400mm x 1000mm

  4. #4
    Join Date
    Mar 2011
    Location
    Olalla, WA
    Posts
    1,532
    Another thing to check is the duration that the laser is set to fire. On mine a setting of "0" means that it fires for as long as you hold the button. If it was set too low the "on" time may be too little for it to do anything. I usually use 100 which is 100 milliseconds, which is 1/10 of a second.
    Shenhui 1440x850, 130 Watt Reci Z6
    Gerber Sabre 408

  5. #5
    Join Date
    Jul 2014
    Location
    Central FL
    Posts
    19
    Ken and Rich: thanks, that is along the lines of what I was thinking. Unfortunately my machine hasn't made it home yet and is still at a friend's house 120 miles away. Is setting these parameters intuitive for a noob like me? I see the idle interface in the manual shows max power and run speed. Is this where those items are configured? I have a few issues and I'm trying to resolve them one at a time. This seemed like the place to start. Thanks again for the help, I'll keep researching.

  6. #6
    Join Date
    Jun 2011
    Location
    Mount Gilead, Ohio
    Posts
    121
    Shawn,
    No one hates to read (don't confuse this to think I cant ) more then I do but reading the manual on setup and operation is a must, even doing that it was one hurdle after another and I'm still jumping

    Others I've read just seem to move ahead with no trouble at all it seems, were just lucky I guess LOL.

    Ken
    ExLas 130 Watt Reci
    1400mm x 1000mm

  7. #7
    Join Date
    Jul 2014
    Location
    Central FL
    Posts
    19
    True, but I find the manual is either vague in many areas, or maybe it's my comprehension. I know that the translation from Chinese to English doesn't help that either. Reading is about all I can do until I get back in front of the machine to try again. The pulse issue I would like to resolve first, but if not, I will proceed with the alignment without that function. I can still send a job to pulse the laser from laserworks.

  8. #8
    Join Date
    Jul 2004
    Location
    Victor, NY
    Posts
    1,288
    Shawn;
    I had the same problem with my Shenhui
    Talked to the service guy in China who told me to run a ground wire to the metal part of the flow check valve-has worked ever since
    I kid you not.
    Best Regards,
    George
    Laserarts

  9. #9
    Join Date
    Jul 2014
    Location
    Central FL
    Posts
    19
    I'll definately give that a try. Thanks

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