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Messages - ggallant571

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LaserGrbl / Re: Copying GRBL
« on: Today at 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.

General Discussion / Re: Etching Ceramic Tile
« on: Today at 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.

T2 Engraving / Re: etching slate
« on: Today at 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.

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.

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

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.

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.

Engraving / Re: slate and remembering settings
« on: September 21, 2020, 06:15:47 PM »
For slate I do 0.1 resolution at half your speed. I tend to think of etching slate as creating a series of small explosions that crack the surface of the rock. I purchase slate from michaels,com for about $3.50US per pack of four. Order $50US and get free shipping. Order exactly $50 and get 20% off which bring the price down to $40 and negates the free shipping. Shipping is $8.50 per 4 pack. I have about 200 slates in the basement.

Trouble Shooting / Re: Stepper motor weird noise. Like stuck.
« on: September 14, 2020, 10:35:02 AM »
Stepper motor driver chips typically have a max current adjust. Set too high and the motors can overheat. Set too low and the motors can stall.

Does you problem occur everywhere or at specific points? Does it loose position or recover? Does it happen with and without laser working? Suggest you generate a test pattern that demonstrates the problem at its worse.

T2 Engraving / Re: Loss of resolution
« on: September 11, 2020, 09:09:48 AM »
Its should be a glass lens.My guess would be some sort of solvent that dissolves oils. Perhaps a before/after test burn on the same material.

T2 Engraving / Re: Loss of resolution
« on: September 11, 2020, 08:12:32 AM »
I find it useful to have "generic" test patterns. The one I am currently using does lines at different spacing (0.10, 0.15, 0.20mm).


Having the start/end points offset mean I can see the line gaps with a microscope. Do this for both horizontal and vertical burns at various speeds and power. Currently it is hard coded into my host burn application. Probably could dump the gcode to a file but you would need to manually edit for your environment.

Diode lasers do expire. Suspect the hobby grade have a relatively low life expectancy. I have 3 dead ones!!

Does leather emit an oily smoke? Have you cleaned the lens?

What Can Be Cut? / Re: 1/8 inch (3mm) thick white acrylic
« on: September 06, 2020, 06:30:00 PM »
That was my experience. I bought intending to cut 3mm clear acrylic for robot parts. Still haven't been cut. Got sidetracked by laser etching and writing a Linux laser control burn utility. BTW - that robot project is sitting in a project box awaiting legs!!

What Can Be Cut? / Re: 1/8 inch (3mm) thick white acrylic
« on: September 06, 2020, 05:11:01 PM »
That was the reason for me purchasing a 5.5W diode laser 4 years ago. This forum set me straight. I have had some success with a 40W CO2 machine.

FAQs For New Users / Re: Straight to T2?
« on: September 04, 2020, 07:40:34 PM »
1 - these are incredibly simple machines with readily available replacement parts.
2 - 99.9% of us had no prior experience with laser etcher prior to our first kit.
3 - 90% of us had minimal art or image manipulation skills.
4 - The instructions and included software are probably worthless.
5 - You came to the right place to start.
6 - Check if there is a Maker Space or Men's Shed in your area.

Trouble Shooting / Re: Low power when jogging still burns
« on: September 04, 2020, 07:14:23 PM »
Could be a poor connector or broken wire. I attach the cable at the laser end so that the movement does not flex the connector. Broken more than one solder junction.

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