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Thread: What is wrong with this 150W?

  1. #31
    Quote Originally Posted by Michael Henriksen View Post
    You haven't accidentally set the max power on the controller display by chance? I once sold a laser and the new owner could not get it to cut anything even at 90% power. Turns out he had set max power on the display to 30 (Leetro controller).
    Unfortunately not. It's set to 95%.

  2. #32
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    What is your max set in your software settings.

  3. #33
    Quote Originally Posted by Jerome Stanek View Post
    What is your max set in your software settings.
    Min 1%
    Max 99%

  4. #34
    14mm per second is about what you would expect from a 150 watt tube on 6mm acrylic at between 75% and 90% power, the ability to cut deep is a product of the materials rather than the tubes output. Acrylic is one of the cases when fast air won't help and may actually be detrimental.
    To see the benefit of the bigger tube you would need to go to a longer focal length lens, problem is that's going to drop the power density as well so you will be back to tail chasing.

    What you are up against is the properties of the material and the gaussian nature of focussed laser beams and that 6mm materials on a DC tube is at the upper end of what they will cut reliably at any sort of speed. For a better example, get some 2mm thick material and run the same tests, if the machine is running right then the 2mm will cut a LOT faster with a 150 watt compared to an 80 watt
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  5. #35
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    Quote Originally Posted by Dave Sheldrake View Post
    For a better example, get some 2mm thick material and run the same tests, if the machine is running right then the 2mm will cut a LOT faster with a 150 watt compared to an 80 watt
    This is a good next step. Given that your power outputs at the different %'s look reasonably correct you should see a difference in the cutting at the very high end of the speed spectrum.
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  6. #36
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    Do you mean 100mm/m?
    100mm/s is a very fast speed that translates into 6000mm/m
    and 500mm/s is 30000mm/m

    To be honest I do not believe that you can cut through 12mm thick plywood on a 150W machine. I have a 280W laser with UK tubes(2x140W) and I cannot even cut through 9mm plywood at any reasonable speed. To cut 16mm thick MDF I use about 500mm/m and 90-95% power and for 9mm MDF I use about 1350mm/m and the same power. So you would guess that speed between 500 and 1300 will be ok for softwood interior plywood but it is not. I believe the thick layer of glue between veneer sheets contributes to very bad quality edges and timber knots make it hard to cut through. 19mm thick solid pine though is cutting like a butter at 1000-1200mm/m and I barely see any knots problems with solid pine.
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  7. #37
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    Quote Originally Posted by Mike Lysov View Post
    To be honest I do not believe that you can cut through 12mm thick plywood on a 150W machine.
    I've cut through 1/2" ply at 80W with no problem, even 3/4" oak. Recently I cut through 6mm marine ply, charred edge, but it worked. I can absolutely cut 12mm regular ply on my 130W machine.

    Quote Originally Posted by Mike Lysov View Post
    I have a 280W laser with UK tubes(2x140W) and I cannot even cut through 9mm plywood at any reasonable speed.
    Not being able to cut, and not being able to cut at "any reasonable speed" are very different. A reasonable speed for one person may not be for another. I consider the speed to be "reasonable" if it is faster than cutting with a jigsaw. For example, I recently cut parts for a 20ft boat out of 6mm marine ply. For the long strakes (8ft each) the cutting was too slow. Instead I just used the laser to mark the lines then I cut by hand. However for the frames it was faster to let the laser do the cutting - I just had to sand the charr off the edges.
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  8. #38
    Quote Originally Posted by Dave Sheldrake View Post
    For a better example, get some 2mm thick material and run the same tests, if the machine is running right then the 2mm will cut a LOT faster with a 150 watt compared to an 80 watt
    The thinnest I have is 4 mm ply, but should still work?

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  9. #39
    Can you show us screen shots of your Cut settings and machine settings?
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  10. #40
    on 4mm Ply 45mm per second and you are at the limit of what it will cut at on anything under a 200+ watt machine with fast air, 50mm per second is pretty fair for a 150 watt running normally at it's peak power
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  11. #41
    I’ll make a table to map my actual amp readings to watt:

    30mA = 150W

    90% 30,6mA 153W
    80% 30,1mA 150W
    70% 26,9mA 135W
    60% 23,6mA 118W
    50% 19,8mA 99W
    40% 15,7mA 78W
    I didn’t take a reading on 45% so I have guesstimated it to 90W.

    I stop seeing changes around 40-45, so 80-90W.


    4mm plywood:
    90W it cuts through at 50mm/s
    150W it cuts through at 50mm/s

    6mm plywood:
    78W it cuts through at 20mm/s
    150W it cuts through at 20mm/s

    12mm plywood:
    78W it cuts through at 4mm/s
    150W it cuts through at 4mm/s

    15mm plywood:
    -

    6mm acrylic
    78W it cuts through at 16mm/s
    150W it cuts through at 16mm/s


    There’s no wood engraving differences between 78W and 150W.


    So what’s the benefit/difference of having a 150W over an 80W?

  12. #42
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    You're not running your tube at 30ma are you? It will burn out much faster.
    Most folks try to stay at 20% under max power and some say 30%
    That's why a 150w over an 80w on a glass tube as far as power goes. The 150 will run a little more like 110w and stay at safe levels.
    How hard were you running the tube before the amp meter ? Hopefully you didn't damage your tube prematurely.
    I don't run my 130w over 24ma just to play it safe.
    Last edited by Ron Gosnell; 04-04-2017 at 3:22 PM.
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  13. #43
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    I was told by the guys that sell our laser that 95% of the max power is just fine on the Chinese machines with a glass tube. It's just that you don't want to run it at max power (or higher); but I was instructed that a 5% buffer was fine. On my 60 Watt it maxes around 22-23ma output.

    Maybe it's a little different on the higher wattage tubes, but 20-30% seems excessive even as a conservative estimate.
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  14. #44
    Quote Originally Posted by Patric Sandelin View Post

    30mA = 150W

    90% 30,6mA 153W
    80% 30,1mA 150W
    70% 26,9mA 135W
    60% 23,6mA 118W
    50% 19,8mA 99W
    40% 15,7mA 78W
    Without knowing which tube you have, it does look like you might be overdriving your tube if you're at 30.6mA @ 90% power. Am I reading that right?

  15. #45
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    Quote Originally Posted by Matt McCoy View Post
    Without knowing which tube you have, it does look like you might be overdriving your tube if you're at 30.6mA @ 90% power. Am I reading that right?
    On my laser I have to keep below 90% power or it is over driven. I have a 60 watt tube so now I have the max power set at 85% that way I over drive the tube even if I put in 90%

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