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Messages - ggallant571

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31
FAQs For New Users / Re: Squiggly lines
« on: October 08, 2020, 08:41:07 AM »
If I recall correctly Steve Nottingham posted a wheel tension adjustment fixture. Might have been 2 or 3 years ago. It fit on the bottom and was designed to reduce the sway.

32
Engraving / Re: GRBL 1.1e burning weaker
« on: October 07, 2020, 09:44:17 PM »
That make no sense. Perhaps you changed the parameters such as the max rate.

33
T2 Engraving / Re: GBR files
« on: October 07, 2020, 07:55:22 AM »
Nottingham - I suspect it is the transparency laser. Try disabling it off before inverting.

34
Trouble Shooting / Re: Connecting the laser directly to the source
« on: October 05, 2020, 10:52:34 PM »
The three wires are GND, +12V, PWM. Traditional colors are GND =BLACK, Power= RED. You need to match the the signal names, not the colors. Looks lie your second picture is designed to use an independent power supply. If your go that route to need to connect the GNDs.

With a 3-wire connection most laser modules use a high (> 2V) to signal ON. The controller firmware drives this signal LOW to turn the laser OFF. If that active drive signal is missing the input on the laser module will float high resulting in a steady ON condition. Many of us have installed pull-down resistors on the PWM line to avoid this condition. I typically use a 3.3K. Cost is about 0.02USD.

35
Benbox / Re: Need help w/ daughter's laser engraver not burning
« on: October 04, 2020, 05:28:49 PM »
The typical color codes:
   BLACK     - GND
   RED         - +12
   YELLOW - PWM

Getting 12V between BLACK & YELLOW sounds wrong. Do you see any identification on controller or laser?

36
T2 Engraving / Re: etching slate
« on: September 27, 2020, 11:28:56 AM »
If I understand correctly you are adding text to an existing etching, Any idea of the process used to create the originate etching?

37
T2 Engraving / Re: etching slate
« on: September 27, 2020, 09:37:11 AM »
I'm not familiar with "Sketch".

38
T2 Engraving / Re: etching slate
« on: September 27, 2020, 08:14:55 AM »
Don,

There are a lot of 0.2mm burn line segments in the james_watson_raster.nc file. The resolution is also set at 0.2mm. I don't know the algorithm used by T2 to convert image resolution but I find that 0.1 works better on slate. I also find the the minimum line length needs to be 0.3mm.

If it is possible post the source art work. James Watson any relation???

George

39
LaserGrbl / Re: Copying GRBL
« on: September 26, 2020, 10:34:04 AM »
I don't know why I would want to slow down to 8000. Been cutting 6mm stainless steel in single pass at 24000.

40
General Discussion / Re: Etching Ceramic Tile
« on: September 26, 2020, 06:49:56 AM »
I am planning on trying the dual color scheme. First layer is a color, second is flat black. Depending on the laser power you burn just the black exposing the color or all the way thru to the tile.

41
T2 Engraving / Re: etching slate
« on: September 26, 2020, 06:45:24 AM »
Not all slate reacts nicely to diode lasers. I have 3 large boxes (free to me) of gray slate that is immune.

Sealing the surface first helps improve the contrast. The coated slate appears darker while the burn is more gray. I suspect the difference fades with time.

Post your source file and I will take a peek.

42
General Discussion / Etching Ceramic Tile
« on: September 25, 2020, 05:56:09 PM »
I have been experimenting etching ceramic tile with a 2.5W diode laser. Nicky Norton has published on Facebook a nice tutorial along with about 100 great images using white paint on white tile. I have 100% failure but using dark paints has been very promising. Attached was with dark green high temperature paint. After etching washed with acetone and dish detergent. Getting the right paint layer depth is critical. So far, success outnumbers failures. Just bought a box of 92 100x100mm tiles and 4 of these 200x100mm for under $15US. Suspect the cost of paint and cleaners cost more than the tile.

Should you give it a try it is very important to wash the tiles prior to painting.

43
Cutting / Re: Cardboard 2mm
« on: September 24, 2020, 07:27:04 AM »
Perhaps 2mm "gray" cardboard is the problem.

44
BenCutLaser / Re: Snij uren Laser
« on: September 24, 2020, 07:20:53 AM »
1. I am of the opinion that diodes are sorted according to quality and that what fails the industrial quality ends up as hobby.
2. Chinese laser vendors lie.
3. Low cost high power is obtained by overpowering the diode very much shortening its life.

I maintain a log that included the diode rating, burn speed & power, material, project name, and comments. It is quite evident that my 2.5W is slowly degrading while my 3.0W died rapidly.

45
T2 Engraving / Re: etching slate
« on: September 23, 2020, 08:07:11 AM »
Not all slate is etchable. I have 4 boxes of grey slate (free) that are immune to the diode.

I typically use at least 3 pixel wide lines.

Are you doing an outline? Try raster filled image.

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