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Messages - ggallant571

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Assembly Help / Re: Rebuild
« on: May 27, 2020, 01:09:25 PM »
If your laser has 2 wires then you need a controller with the on-board switching MOSFET.

T2 Engraving / Re: firmware for core-xy
« on: May 27, 2020, 01:03:41 PM »
Already working on rotary table fixture.

Attached is a simple gcode program to etch a square. Each side is 200mm and the speed is set 4800 mm/min. 4800 mm/min is 80 mm/sec and the elaped rime should be 10 seconds. It takes 15 seconds. Tried at 2400 and 1200 and the time were 29 and 54 secs.

My bed is approx 350x350. Edit as needed if your bed is less than 200x200.

T2 Engraving / Re: T2 Language
« on: May 27, 2020, 09:18:39 AM »
We have a few units installed at local greenhouses. The owners were eager to get involved but after a month lose interest. Common problem was it just works and once setup they do nothing. Guess that is a good thing.

We have a version, awaiting the virus to abate, at a local school where there are planting trays mounted over large fish tanks. It pumps water (with fish poop) from the fish tank into the growing vats where somehow the plants purify the water which is recycled back to the tanks and help feed the fish. I am not a biologist!!!! Computer also activates grow lights based on sunrise/sunset to simulate a natural environment. My wife used a version to grow quite a lot of lettuce (and other plants) this winter.

General Discussion / Re: New wheels
« on: May 27, 2020, 07:23:48 AM »
Bright light bulbs require fresh batteries. My died years ago. Now the gremlins hiding in "should be easy projects" are having a field day.

Trouble Shooting / Re: Laser hits dead spot when engraving
« on: May 27, 2020, 07:09:58 AM »
Looks too clean to be random, Can you post the source image? Does the location move if you change the speed?

T2 Engraving / Re: firmware for core-xy
« on: May 27, 2020, 07:06:10 AM »
If it is a constant I will put the correction factor in my host application. I currently have a separate application for etching wine glasses on a rotary table where the speed is adjusted based on the diameter of the glass. Thinking that a checkbox with machine type (aartesian, core-xy, rotary) would make life easier. Also add diameter if rotary. Am currently reworking this code to fit on a 3.5 inch Raspberrry Pi display.

Brain cell just triggered - could the core-xy adjustment be better handled by the host!!!!

T2 Engraving / Re: T2 Language
« on: May 27, 2020, 06:52:33 AM »
I'm fine with embedded C, so so with Linux applications, frustrated by Windows GUI!!!

General Discussion / Re: New wheels
« on: May 27, 2020, 06:50:22 AM »
You do realize this is a test of your mental stamina. The diode knows it has a life expectancy of 2000 hours and is creating obstacles to so that it will never be turned on.

T2 Engraving / Re: firmware for core-xy
« on: May 26, 2020, 05:20:22 PM »
The physical speed is way off. Created a square in gcode with 200mm per side, speed of 800mm/min, and very weak laser. Expected it to take one minute. That was over 2 years ago so will repeat experiment prior to quoting actual number. Should probably try with triangle and circle to see if error is predictable.

If you look at the grbl code where the core-xy motion is calculated it is only a few lines for distance but no compensation for speed.

T2 Engraving / T2 Language
« on: May 26, 2020, 03:48:09 PM »
Zax - would you mind stating what language you developed T2 in. We have an Arduino Mega Greenhouse controller that has a local 4x20 display and configuration/logging via SD card. Would like to add wifi and a GUI for remote control and display of operating conditions. Nothing to to with Lasers but we started with C# on Visual Studio and the learning curve is steep.

T2 Engraving / Re: firmware for core-xy
« on: May 26, 2020, 03:36:58 PM »
I think the newer bootloader is a positive step up. You need a ISP loader to install it which can be made from an Arduino Uno or Nano using feature built into the Arduino IDE. You need 6 wires. 5 of the 6 go from programmer to target 6-pin ISP headers. The 6th is a little different.

Did you make the core-xy from scratch?

I have observed that the speeds are typically off by quite a lot (probably the square root of 2). I maintain a log of laser, speed, & PWM for various media.

T2 Engraving / Re: firmware for core-xy
« on: May 26, 2020, 02:47:50 PM »
Did you ever determine which bootloader you have?

T2 Engraving / Re: firmware for core-xy
« on: May 25, 2020, 06:16:35 PM »
I prefer low level tools for debugging hardware which for grbl devices is a terminal emulator such as teraterm for Windows for gtkterm for Linux. From the command line you can type/execute the basic commands. The list is not very long and can be found with a Google search.

We have:
 G00, G01                      basic X,Y motion
 Fxxx                              motor speed
 M03, M04, & M05          laser enable mode
 Sxxx                               laser power

With the 1.x firmware there is a parameter which disables the laser when there is no motion.

Do you have a spare generic Arduino? If so, you can turn it into a ISP burner. I had similar problem with Nano until I reloaded the boot loader with the "modern" version. The older uses 57600 baud and occupies about 2K code space. The newer is at 115200 baud and uses about 1K. That 1K is likely causing your problem as the 1.f firmware is about 31K.

General Discussion / Re: New wheels
« on: May 25, 2020, 04:57:35 PM »
I got started with the intention of cutting 1/4 inch acrylic. Saw a video of a 5.5W diode cutting clear acrylic with ease. Zax of T2 laser fame, explained the fraud and I was ready to trash the thing. Steve Nottingham, a heavy contributor at the time, posted about etching on slate. Spent the $3.50 for a pack of four and was hooked. Now it is 90% etching and the remaining 10% do cuts to support etchings. Original project/use sits idle.

I have a good selection of balsa but never got it to cut cleanly. What do you make?

General Discussion / Re: New wheels
« on: May 25, 2020, 04:05:39 PM »
Wiggle, Wiggle. Looks to me like its time to raise the waste board.

I use extruded steel positioned about 12mm (1/2 inch) up. Three advantages:
  1.  Can use magnets to hold the material stable.
  2.  When cutting both the laser beam and air assist get to pass thru.
  3.  Greatly reduced charing on the bottom. 

I understand that aluminum honneycomb works better except for the magnetics which is my primary use. Especially useful for etching veneers and other thin wood.

Time for that test burn at 5000 mm/min with tight corners!!!

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