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Thread: Chinese laser purchase/Shenui/Laserworks tips and tricks thread

  1. #76
    Join Date
    Oct 2011
    Location
    Vancouver BC
    Posts
    97
    Hi Rich,

    It looks like I can get some fancy looking digital ones on ebay for not to much, but is the current DC or AC, a search on ebay shows that it seems to matter.

    Hmm, looking further, looks like it's DC.
    Last edited by Greg Facer; 09-10-2012 at 7:04 PM. Reason: found the answer
    80 watt RECI 1290 Shenhui laser.
    Chinese Quick CNC 5x10 toolchange
    Unofficial record holder of 6 tubes shipped for one machine. 2 defective and 4 broken. Recommend Coletech for replacement tube!

  2. #77
    Howdy, new poster here. This is a great resource that you've put together here! I'm very glad to have found such knowledgable posters.

    I'm using the LaserWorks 5.0.21 software package on an Artsign 50W JSM-3060N laser - it has the RDLC320A LCD controller panel. I believe the drive board is a Leetro 6515 but I'm not 100% sure.

    Where in LaserWorks do I set the stepper motor configuration? If I engrave a 10" square, the sides come out at about 9.94". If I engrave a 20" square, they come out at 19.88". It seems to be a rather uniform error so I think I just need to recalibrate my stepper motors, but I can't seem to find where to do this. I thought it was in the "User" tab but I don't see it.

    I'm also having an issue with backlash on my machine. I posted a thread on it here.

    Thanks for any assistance you can give.

    Mason
    Last edited by Mason Atom; 09-24-2012 at 10:01 AM. Reason: change notification preferences

  3. #78
    i have also joined the Shenhui club with a double head 80W, been a real slow build up due to sensor issues.
    i am struggling with engraving cleanly, and also find that the machine heats up quite quickly. any help with this?

  4. #79
    Join Date
    Mar 2011
    Location
    Olalla, WA
    Posts
    1,532
    Quote Originally Posted by Mike Browning View Post
    ... and also find that the machine heats up quite quickly. any help with this?
    Can you be more specific?
    Shenhui 1440x850, 130 Watt Reci Z6
    Gerber Sabre 408

  5. #80
    File... Vendor Settings... (password rd8888) then click the ... by step length under X and Y axes respectively and put in your intended and measured dimensions. Retry and measure, refine, readjust.

    Quote Originally Posted by Mason Atom View Post
    Howdy, new poster here. This is a great resource that you've put together here! I'm very glad to have found such knowledgable posters.

    I'm using the LaserWorks 5.0.21 software package on an Artsign 50W JSM-3060N laser - it has the RDLC320A LCD controller panel. I believe the drive board is a Leetro 6515 but I'm not 100% sure.

    Where in LaserWorks do I set the stepper motor configuration? If I engrave a 10" square, the sides come out at about 9.94". If I engrave a 20" square, they come out at 19.88". It seems to be a rather uniform error so I think I just need to recalibrate my stepper motors, but I can't seem to find where to do this. I thought it was in the "User" tab but I don't see it.

    I'm also having an issue with backlash on my machine. I posted a thread on it here.

    Thanks for any assistance you can give.

    Mason
    Shenhui 1280 100W RECI

  6. #81
    Quote Originally Posted by john banks View Post
    File... Vendor Settings... (password rd8888) then click the ... by step length under X and Y axes respectively and put in your intended and measured dimensions. Retry and measure, refine, readjust.
    Awesome. Super thanks! I'll try this tonight.

    mason

  7. #82
    Join Date
    Mar 2011
    Location
    Olalla, WA
    Posts
    1,532
    I wrote at some length earlier about setting the step length. Not everyone agrees with me but I think the method of entering the values and letting the software work out the step length is rubbish. If you use that method then you are adjusting the mathematically derived step length to account for some other error. That adjustment will then only be applicable to that particular size of object. Make something twice as small or twice as large and you will find that you need to repeat that processs.

    My Shenhui machine should be set to 6.000 step length. Period. If that does not produce an accurate cut then the error is elsewhere in the machine.

    Before tweaking anything else make sure you have tuned the backlash - and do not over tighten the belts.
    Shenhui 1440x850, 130 Watt Reci Z6
    Gerber Sabre 408

  8. #83
    Quote Originally Posted by Rich Harman View Post
    That adjustment will then only be applicable to that particular size of object. Make something twice as small or twice as large and you will find that you need to repeat that processs.
    Hmmm... on my machine it seems to be a systematic error that is propagated relative to the object size - that is to say the percentage offset seems to be the same whether I make a 2", 5", 10", or 20" square. Thus far it appears as though my universal correction to the step length is working correctly, regardless of object size. Odd.

    mason

  9. #84
    Join Date
    Mar 2011
    Location
    Olalla, WA
    Posts
    1,532
    I discovered an odd behavior the other day. In LaserWorks when entering the speed and power there are two places to enter power - Min and Max. I generally just enter the max and leave the min alone. Never had a problem.

    So I had this 2' x 4' sheet of 3/8 black where the whole sheet had to be cut at once. To be absolutely sure that I cut it cleanly all the way through I lowered the speed to 3mm/sec on the parts that were on the lower right of the bed - furthest from the laser tube. All worked fine until it came to the 3mm/sec part. The ammeter went down to 9mA from it's normal 25 mA. The display correctly said it was at 90% and strangely enough it was still cutting through.

    I'll spare the details of how I tracked down the problem but it turns out that entering the power setting into both the min and max was the fix. For some reason, when the speed goes below 4/mm sec the power to the laser seems to alternate rapidly between the min and max settings.
    Shenhui 1440x850, 130 Watt Reci Z6
    Gerber Sabre 408

  10. #85
    Join Date
    Oct 2004
    Location
    Cape Town, South Africa
    Posts
    3,922
    I've never worked out what that max/min thing did (in software) , we just set it almost equal like 27 min , 30 max...
    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

  11. #86
    Min and max are used for some of the rastering methods that vary power - like output direct (min and max set the power levels that correspond to RGB 0xffffff and 0x000000) and IIRC also the ramp mode but we rarely use either of these modes and normally set them both the same.
    Shenhui 1280 100W RECI

  12. #87

    overheat

    Quote Originally Posted by Rich Harman View Post
    Can you be more specific?
    I have a twinhead SH-G1290 80W RECI LASER ENGRAVING AND CUTTING MACHINE when i cut i find the machine overheats quickly and i have to keep stopping the machine and wait to cool off.
    the chiller is a cw-500 as advised on this forum. i am cutting at 80-85% 3mm perspex, do i need to look at improving the chiller?

  13. #88
    Join Date
    Mar 2011
    Location
    Olalla, WA
    Posts
    1,532
    How are you determining that it is overheating? I assume you mean the tube/tubes and not the motors.
    Shenhui 1440x850, 130 Watt Reci Z6
    Gerber Sabre 408

  14. #89
    Join Date
    Sep 2011
    Location
    naples florida
    Posts
    278
    hi mike
    thats a lot of power for 3mm perspex with a 80W tube, what speed you are running?? I use 40w the small machine and for perspex i only use 45% power and 10mm/s speed.
    greetings
    waltfl

  15. #90
    i have reduced the power and its really cold out so running ok now, couple questions, if the is scaling in the tubes from the water is there any way to flush/clean? also struggling to engrave letters properly as it seems to go a little fuzzy almost like there would be blowback, i am struggling to etch finely, cutting is no probs just etching seems to be an issue?

    SH-G1290 80W RECI LASER ENGRAVING AND CUTTING MACHINE

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