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Messages - Zax

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General Questions / Re: Laser weak works but no engraving
« on: July 08, 2020, 11:59:06 AM »
It is probably to switch between PWM modes, as you are using a TTL input in the other mode it doesn't do anything.

You should be able to control weak power from the software, in T2Laser just enter 50 for the manual laser power and it will be similar to the previous "weak" power mode. You can use this for engrave frame as well if you prefer.

No, T2Laser assumes metric if unspecified but in your DXF it has:


The DXF reference spec published by AutoCAD (the format owners) states that 0 = English and 1 = Metric units.

You sure made that sound complicated when the problem was your drawing is in inches but has no defined dimensions so T2Laser defaults to metric.

All you have to do is tell T2Laser it's inches, either in your DXF (maybe there's a setting in your CAD program) or use the menu to override the units.

I also noted it's not at 0,0 (it's close) but you can either fix that in CAD or use the Relocate Origin setting to shift it.

General Discussion / Re: GRBL G00 and laser
« on: July 02, 2020, 11:07:11 AM »
Only in laser mode.

Engraving / Re: Laser turns on but wont burn
« on: June 30, 2020, 01:51:14 PM »
It could but the picture he posted shows the older red clone board, I have only seen these use a MOSFET.

No - back in Texas, although wondering if that was a wise decision  ::)

Update? You mean T2Laser, no that never changes the parameters on your machine unless you specifically click to upload defaults and those are 80.

If you have used other software then some do change parameters without asking, which is a good way to brick a Nano.

Engraving / Re: Laser turns on but wont burn
« on: June 30, 2020, 11:41:38 AM »
It must be a non-TTL if only 2 wires from the controller, it probably splits on the module between the laser diode driver and fan.

So it would be OK to apply 12VDC directly and see if it's capable of burning or is just a bright laser pointer.

Engraving / Re: Laser turns on but wont burn
« on: June 30, 2020, 09:47:48 AM »
It looks like an older style controller board, is the laser 3-wire (TTL)?

If not, you could connect 12VDC directly to the module and verify if it will burn or not. If it's a TTL module you can still do that but need to apply 5VDC to the TTL input (you can get that from the Nano if needed).

I suspect it's just not powerful enough although I have no experience with a 300mW module. The lowest I've tested was a 1600mW and that was actually a really good engraver, very small spot size.

Other thoughts, clean the lens but be careful not to lose the spring - also check orientation when you put it back in.

Engraving / Re: Laser turns on but wont burn
« on: June 30, 2020, 03:55:00 AM »
In that case you are getting max power.

As I said 300mW is pretty weak, was it a new module or used?

Yes the issue is your machine, or rather the firmware. It needs to be calibrated.

T2Laser sends G-code, so tells the firmware to move 50mm. It is the firmware that determines based on the calibration how many steps to move the motors. So once you adjust the steps per mm (calibration) it will be fixed.

If you are using my firmware you can do the calibration from the T2Laser menu, see the attached screenshots and measure the actual distances and enter them in the boxes, click calibrate and the correct parameters are calculated and uploaded to the controller.

Engraving / Re: Laser turns on but wont burn
« on: June 29, 2020, 03:03:36 PM »
Agreed. I was going to suggest trying that but I just assumed it would burn a nice hole.

So what firmware are you using, have you tried setting laser max or the manual laser power to 1000? If you are using the Eleks firmware it is probably using 1000, although this would be changed to 255 if you either loaded my firmware or uploaded my default parameters.

The PWM output is 8-bit (0-255) and greyscale images are generally 8-bit so everything is a direct 1:1, when you use 1000 as a Grbl parameter it needs to downscale the output so you can get banding in the engraving (depends on the image).

It is 288 pixels, so if you are using 0.1 resolution you need 10 pixels per mm so it would be 28.8 mm.

In Photoshop set the dpi to 254 if you are using 0.1 resolution but most lasers have a 0.16 to 0.24 spot size so using 0.2 resolution = 127 dpi is a better choice. If you match the dpi to the resolution you are outputting the sizes will match.

I don't know why you got an oval, have you tested the sample circle in the Help menu to make sure the machine is calibrated?

Engraving / Re: Laser turns on but wont burn
« on: June 29, 2020, 02:05:05 PM »
300mW is a pretty low power laser module but at a slower feed rate (try 200) you should be able to burn hard wood.

T2 Engraving / Re: Feed rate - units question.
« on: June 28, 2020, 01:14:54 PM »
The units are determined by your controller / firmware, T2Laser sends G-code which doesn't specify the units. Grbl uses the units I provided.

FAQs For New Users / Re: Software Problem
« on: June 28, 2020, 07:06:33 AM »
You were lucky (or maybe not), it never even installed for me due to malware.

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