Author Topic: One shade of greyscale with T2 and Laseraxe Engraving Laser  (Read 281 times)

segoo

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Hey folks,

New to the engraving scene and looking for advice with settings in T2 for a laseraxe 15W DIY laser engraver.  I updated the custom firmaware 1.1f as I was not able to get the default to work.  I tried different feed rates, power settings and mode changes (velocity/photo) with no luck.  All I seem to get is just one shade of greyscale through dithering.  I cannot use the  greyscale setting because i'm not equipped with TTL.  Tried the help samples in T2 and still a no go.  Any ideas on what I can do or settings to try.  I attached my GRBL parameters and some pics of the issues I am having.  Thanks! 

Connected COM3 115200
Grbl 1.1f Ready
$0=10 Step pulse, microseconds (10)
$1=25 Step idle delay, milliseconds (25)
$2=0 Step port invert, mask (0)
$3=2 Direction port invert, mask (0)
$4=0 Step enable invert, boolean (0)
$5=0 Limit pins invert, boolean (0)
$6=0 Probe pin invert, boolean (0)
$10=1 Status report, mask (1)
$11=0.010 Junction deviation, mm (0.020)
$12=0.002 Arc tolerance, mm (0.020)
$13=0 Report inches, boolean (0)
$20=0 Soft limits, boolean (0)
$21=0 Hard limits, boolean (0)
$22=0 Homing cycle, boolean (0)
$23=0 Homing dir invert, mask (0)
$24=100.000 Homing feed, mm/min (100.000)
$25=1000.000 Homing seek, mm/min (1000.000)
$26=250 Homing debounce, milliseconds (250)
$27=1.000 Homing pull-off, mm (1.000)
$30=255 Max spindle speed, RPM (255)
$31=0 Min spindle speed, RPM (0)
$32=1 Laser mode, boolean (1)
$100=80.000 X steps/mm (80.000)
$101=80.000 Y steps/mm (80.000)
$102=80.000 Z steps/mm (80.000)
$110=4000.000 X Max rate, mm/min (5000.000)
$111=4000.000 Y Max rate, mm/min (5000.000)
$112=6000.000 Z Max rate, mm/min (5000.000)
$120=800.000 X Acceleration, mm/sec^2 (800.000)
$121=800.000 Y Acceleration, mm/sec^2 (800.000)
$122=5000.000 Z Acceleration, mm/sec^2 (5000.000)
$130=400.000 X Max travel, mm (400)
$131=300.000 Y Max travel, mm (300)
$132=200.000 Z Max travel, mm (200)

ggallant571

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #1 on: June 14, 2019, 08:16:13 PM »
Is this a diode or CO2 laser?

I find it is easier to use "standard" test patterns when setting up these machines. Pictures have too many variables. Also please indicate the material you are burning.
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segoo

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #2 on: June 14, 2019, 08:35:14 PM »
This is a diode laser and I am burning on a pine board.  I did some test samples from the T2 help menu,  but sent the picture pic for reference.  I attached the grayscale bar test.

ggallant571

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #3 on: June 14, 2019, 09:41:50 PM »
That looks pretty poor for grey scale. You say you are not equipped for TTL. Is there a power MOSFET on you controller?  Can you post a wiring diagram?
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Zax

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #4 on: June 15, 2019, 02:21:50 PM »
Grey scale mode may work using PWM (which is what the MOSFET does) but dithered and velocity modes are probably your best bet.

Dithered is obviously simple, set the resolution to your spot size (0.2 would be good to start) then set feed rate to get a dark burn and click the dithered option.

Velocity mode varies the feed rate between engraving and rapid to change the burn. First determine what feed rate produces a dark burn, that's your engraving feed rate, then see what feed rate is fast enough to very lightly burn and add ~200 to it, that becomes your rapid feed rate.

Leave resolution at 0.2 and enable velocity mode and keep grey scale mode selected.

segoo

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #5 on: June 15, 2019, 04:31:01 PM »
Unfortunately I'm not a tech savvy kinda fella and not sure where the Mosfet would be located on the board.  ggallant571, I attached pics of the laser face and controller board.  Zax, I'll run some burn tests and see what I can find from it. 

ggallant571

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #6 on: June 15, 2019, 07:48:01 PM »
Looks like you have a TTL PWM configuration. The wires at the laser input +12, GND, PWM.  What is the model info of your controller?  It is necessary to have the GNDS of the laser supply wired to the GND of the controller. Perhaps  the FAN power makes this connection.
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segoo

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #7 on: June 15, 2019, 08:23:55 PM »
I took this straight from their site:  https://www.laseraxe-customize.com/online-store/Laseraxe-USB-CNC-3-Axis-2-Phase-4-Wire-Stepper-Motor-Controller-Driver-Board-CNC-Laser-Engraving-Machine-Mainboard-p105357265

Brand: Laseraxe

Specifications:

Input Voltage:DC 12V

Input Current:2.5A

Power port:DC5.5*2.1

Size:100X80mm(L*W)

Compatible Stepper Motor:2 phase 4 wire type(less than 2A power supply) ..

Appears to have a nano ATmega328 arduino style board.

Zax,  I found a good burn at 400 and light burn at 700.  I made those settings for speed and 0-255 for power.  Selected velocity and greyscale at .2 resolution.  The bar has more burn to it, but it still remained evenly shaded throughout.  I tried a couple different feed rate and power setting with similar results.  I am going to try different materials tomorrow with hopes of better results since pine boards are not so friendly.

ggallant571

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #8 on: June 15, 2019, 09:37:34 PM »
Please sketch a wiring diagram showing connections bewteen Power Supply, controller, & laser. Your picture appears to show  2 black wires on the LASER Port header and one red on the on the TTL. The laser module shows RED on PWm, RED on +12, and BLACK on GND plus another RED/BLACK pair for fan,
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Zax

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #9 on: June 16, 2019, 04:04:13 AM »
It looks like the wiring is incorrect, you should be able to use standard grey scale (TTL).

ggallant571

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #10 on: June 16, 2019, 11:30:41 AM »
I suspect there is a power MOSFET on the controller and the GRBL firmware will be turning it ON/OFF according to directions from the host software (T2). The ON/OFF signal is also going to the TTL control input of the laser module where it is again being switched. You are getting a burn when the two are ON together for enough time to create to activate the diode.

This is my guess and history has proved that I have a 50% chance of being right and a 90% chance of being wrong.
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segoo

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #11 on: June 17, 2019, 05:01:45 PM »
I attached a paint sketch of what i see regarding the wires.  I followed the manufacturers diagram, but that doesn't mean I did it all correctly. 

ggallant571

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Re: One shade of greyscale with T2 and Laseraxe Engraving Laser
« Reply #12 on: June 17, 2019, 06:12:21 PM »
Looks strange to me!!! Do you have a pointer to the manufacturer instructions an/or controller board?

If I were making the cable there would be 5 wires, 3 for laser and 2 for fan. The GNDs in BLACK, the +12V in RED, TTL/PWM signal in something else. Two laser powers in 22 gauge and the others in 26 gauge.
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