UCCNC M10 Laser not turning off on M10 Q0 Command

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Re: UCCNC M10 Laser not turning off on M10 Q0 Command

Postby 3d0g » Sun Oct 21, 2018 6:07 pm

Here's my run of Pulse Width Test 254DPI UCCNC F78.7401.txt

It's only approx 5mm x 5mm so detail is hard to pick out but it generally looks right. I'm running 1.2049.


Image
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Re: UCCNC M10 Laser not turning off on M10 Q0 Command

Postby cncdrive » Sun Oct 21, 2018 6:31 pm

Yes, the drawing is very small, we put it in electro-microscope to see the details is why the image is a bit "oval" on the picture. :)
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Re: UCCNC M10 Laser not turning off on M10 Q0 Command

Postby 3d0g » Sun Oct 21, 2018 6:42 pm

I'm running a 100W CO2 laser and throttled power back as far as I could yet still get it to trigger. My beam width at the focal point is .33mm - over 3x the size of the movements in this test file...
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Re: UCCNC M10 Laser not turning off on M10 Q0 Command

Postby 3d0g » Sun Oct 21, 2018 6:56 pm

mayhem2408 wrote:As you can see from the original image, even on your machine is doesn't line up quite right.


I highly suspect that was because the metric feed rates are nonsensical to my machine and got capped by UCCNC.
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Re: UCCNC M10 Laser not turning off on M10 Q0 Command

Postby mayhem2408 » Wed Oct 24, 2018 10:43 am

cncdrive wrote:We have just ran a test using your code with UCCNC version 1.2106 with UC100. Feedrate was F2000.
Please see the test results picture in attachment.
The laser module we used has some focus issues which we did not have time to fix now, but it can be seen that there is no shift and no missing lines.

I will install V1.2106 on my laptop and give it a try. I am not using this version on my production machine as it is still in beta. I will post the results tomorrow. Thanks.
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Re: UCCNC M10 Laser not turning off on M10 Q0 Command

Postby mayhem2408 » Wed Oct 24, 2018 10:48 am

Robertspark wrote:Balazs, thanks for testing that.

Mayhem, is there capacitors that are being charged somewhere in your circuit that are delaying the laser?

From what I've seen of these circuits before there is a main power supply circuit which provides the bulk of the current to the laser which may be de-energised by the e-stop button / circuit and then the logic side which just fires the MOSFET very fast.

The driver I am running as been specifically designed for rapid fire from a 5V TTL signal. As I have shown in a previous post from the oscilloscope test, the response time of my laser driver is not the problem. It will fire at 50KHz with no detectable delay. 1KHz is a piece of cake for this driver.
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Re: UCCNC M10 Laser not turning off on M10 Q0 Command

Postby mayhem2408 » Wed Oct 24, 2018 11:08 am

3d0g wrote:Here's my run of Pulse Width Test 254DPI UCCNC F78.7401.txt

It's only approx 5mm x 5mm so detail is hard to pick out but it generally looks right. I'm running 1.2049.

It is very small. My Laser Lens can focus down even further that 254DPI. For high detailed photos, I run at 339DPI to 483DPI or about 13 pixels per mm to 19 pixels per mm. CO2 lasers just can't get this small and i'm yet to see any of the cheap china diode lasers focus this small either.

This is a 35mm engraving or about 1 3/8".
Line spacing is 13.333mm per line or 339DPI. Pixel spacing on the line is 19 pixels per mm or 483DPI. This was does using a GRBL controller.
GRBL 0.05mm GS.jpg

I will be testing my UC100 on V1.2106 tomorrow to see how it goes.
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Re: UCCNC M10 Laser not turning off on M10 Q0 Command

Postby mayhem2408 » Wed Oct 24, 2018 11:13 am

3d0g wrote:I'm running a 100W CO2 laser and throttled power back as far as I could yet still get it to trigger. My beam width at the focal point is .33mm - over 3x the size of the movements in this test file...

CO2 lasers are great for power, but not for dot size. My 4.5W diode laser has a focal dot size of 0.07mm and the driver provides very good linear control of the power.
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Re: UCCNC M10 Laser not turning off on M10 Q0 Command

Postby mayhem2408 » Thu Oct 25, 2018 6:20 am

cncdrive wrote:We have just ran a test using your code with UCCNC version 1.2106 with UC100. Feedrate was F2000.
Please see the test results picture in attachment.
The laser module we used has some focus issues which we did not have time to fix now, but it can be seen that there is no shift and no missing lines.

Today I setup V1.2106 and on first startup it upgraded the firmware on my UC100. I then ran the Pulse width test again and got massively improved results.
20181025_160126s.jpg

So I tried a larger version of the same test, but the smaller dots didn't go so well.
20181025_165425s.jpg


I then tried my test picture again and it failed terribly.
20181025_161525s.jpg
Attachments
TestFile UCCNC 0.1mm M11.txt
(995.92 KiB) Downloaded 58 times
Pulse Width Test (Larger) 0.1mm UCCNC GRID OmniDir.txt
(22.33 KiB) Downloaded 61 times
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Re: UCCNC M10 Laser not turning off on M10 Q0 Command

Postby 3d0g » Thu Oct 25, 2018 10:06 pm

mayhem2408 wrote:CO2 lasers are great for power, but not for dot size. My 4.5W diode laser has a focal dot size of 0.07mm and the driver provides very good linear control of the power.


Yup, but it serves my needs well. I can readily cut up to 1/2" stock yet still have reasonable engrave accuracy.

Image
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