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Messages - Zax

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1
Hi Tim, yes basically you are correct.

Cutting or engraving is based on the energy absorption of the material, so power density is what matters.

Laser power (output), focus (spot size) and feed rate all contribute to the result.

For cutting 2mm plywood you need a fair amount of energy, so focus to the smallest spot possible and use full power. Then adjust feed rate to cut without burning (<200) and use multiple passes for good results. Look for ply that uses a water based epoxy/resin, as it will cut easier and will burn less.

2
Projects / Re: Velocity Mode
« on: May 23, 2017, 06:04:22 PM »
I haven't used that combination, but the result speaks for itself - it works!

Overscan and reduced acceleration should be off as default, they're more for troubleshooting a machine that isn't set up correctly.

3
T2 Engraving / Re: A few pictures of acrylic engraving
« on: May 23, 2017, 03:13:29 PM »
These are great. I'm actually surprised how good the results are using a 3W diode.

Have you found any colors that work better or don't work at all?

4
T2 Engraving / Re: Error on engraving
« on: May 23, 2017, 09:31:31 AM »
You can also select Check Mode (Settings menu on the Laser Control screen), this just runs the Grbl interpreter and does not send any signals out of the Nano.

5
If you load an image (which is raster format) and trace it, then T2Laser does raster-to-vector conversion and you end up with a vector (paths you can follow).

If you create paths in Inkscape or Corel for example and save in vector format (DXF, PLT) then it will remain as paths.

6
T2 Engraving / Re: Error on engraving
« on: May 23, 2017, 04:14:24 AM »
Can you recap what you've tried?

USB cable, Nano, run the g-code in Check mode, run without motors and laser connected (just the board) etc.


7
General Discussion / Re: Gcode / design for testing on new material
« on: May 22, 2017, 04:36:18 AM »
You could generate the black to white grey scale test (like in my samples) at different feed rates or power levels and save the G-code, then combine it as a single file you can load and run on your material as a test.

I doubt you need to run all values, just 25, 50, 75 and 100% power and 3 or 4 different feed rates.

So create the image at the size you want, generate G-code at one feed rate and save it, then the next and so on until you have the complete job. In future you can just load and run it.

8
Projects / Re: Elk on plywood
« on: May 21, 2017, 01:08:55 PM »
That looks great!

I like that it's not too dark, it has a nice clean look with a lot of detail that would otherwise be lost.

9
Trouble Shooting / Re: new 15000mw 450 nm pak any info please
« on: May 21, 2017, 11:46:49 AM »
@Stonemull using a Coherent laser power meter that records the peak and RMS power.

@ggallant571 that's atypical, most laser diodes have efficiency of 1.6 to 2.4 based on my tests (I used 2X as an example).

@[krazy] Output wavelength and duty cycle (frequency) are more important than power, take this 25W diode as example. It wouldn't cut paper but would be excellent for a laser speed gun.

http://www.newark.com/osram/splpl90/diode-laser-905nm-25w/dp/05M1289

10
General Discussion / Re: Grrr, weird smearing! (still, t2laser)
« on: May 21, 2017, 05:20:36 AM »
I wonder if you add a pull down resistor on the laser module or controller, if that would shut it down quicker although it's more likely the laser driver doesn't switch correctly.

As I said, it's not only the top of the glass the same over burn is visible in other areas where the laser needs to transition from an area of solid black to white. You could test with a black square or thick outline and get the same result.

11
T2 Software Updates / Re: Spindle stay on
« on: May 21, 2017, 05:16:53 AM »
Disable "Jog Rapid" in the Advanced Settings menu, as a rapid by default disables the laser  / spindle.

The jog will now occur at feed rate rather than rapid and you can leave the spindle or laser on and use it like an etch-a-sketch.

12
T2 Engraving / Re: Z axis buttons
« on: May 21, 2017, 05:13:37 AM »
That makes sense, and is probably why Sonny recommends against using the start-up blocks.

13
Trouble Shooting / Re: new 15000mw 450 nm pak any info please
« on: May 21, 2017, 05:10:24 AM »
It's a 6W diode that is pulsed using a very short duty cycle, so peak output may be measured at 15W but actual RMS output (averaged over a few hundred mS is no higher than 8W).

I doubt they actually measured 15W but based it on the in rush current at start-up, which is of course totally false from an engineering stand point.

Regarding the current requirement, assuming 12W it would require 8A @ 1.5V or 1A at 12V so with motors you should use a 5A power supply to be safe (so it sounds like you are OK).

14
General Discussion / Re: Grrr, weird smearing! (still, t2laser)
« on: May 20, 2017, 06:34:54 PM »
It looks like the wood, see the staining in the vertical line down the glass.

The only thing I can think to try is a slightly lower burn, either up the feed rate or reduce power if you have a TTL laser. That may prevent the heat build up and whatever is happening to the wood.

15
T2 Software Updates / Re: Updates
« on: May 20, 2017, 06:32:59 PM »
No, it was someone else but I would like to hear from others to confirm.

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