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Messages - ggallant571

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46
Benbox / Re: y-axis not working mostly
« on: September 24, 2019, 06:04:27 AM »
Zax posts a current version of GRBL firmware configured for a typical laser etching machine. If you don't know it, GRBL is a GCODE interpreter designed to run on a 328 CPU. It has some non-standard options (mostly run-time configuration) but provides a reliable, well behaved, solid opensource platform for diode laser operations. Both BLT & T2  work seamlessly with it.

47
General Discussion / Re: Greetings, and some assistance please
« on: September 23, 2019, 05:26:08 PM »
It is my opinion that there are a limited number of manufacturers and that they all "bin" their products based on quality testing. The "top" quality go to medical/industrial arena while the "bottom" to to hobby electronics. The Russians (Endurance) seem to get the good stuff. There is also the quality of the optics which plays the same game so it is not a simple price comparison.

48
Benbox / Re: New to Laser x moves but Y doesnt
« on: September 21, 2019, 07:08:02 AM »
If you have 2 motors on the Y and 1 on the X axis you need approximately twice the current on the Y. Try setting the X to 0.4 and the Y to 0.8. Test and adjust as necessary.

49
General Discussion / Re: Greetings, and some assistance please
« on: September 20, 2019, 06:24:09 PM »
If the motor drivers were not properly adjusted they could be drawing considerably more than 0.5A each. Given that Chinese specs are somewhat questionable perhaps is is incapable of delivering the 36 watts. Regardless, the power situation is minimal. A quality 6A/12V supply would be a good starting point.

Regarding your etching, where is the starting point? How long did the etching take?
 

50
General Discussion / Re: Greetings, and some assistance please
« on: September 19, 2019, 06:36:37 PM »
I'm going to go with power supply problem. Looking at the picture the X and Y start and end look correct.

51
General Discussion / Re: Greetings, and some assistance please
« on: September 19, 2019, 05:05:18 PM »
These are incredibly simple machines. CPU generate STEP/DIR for the motor and a laser ON/OFF. You can add limit switches for inputs. What makes you suspect the controller? What firmware is running? Did you try any of the test patterns?

52
General Discussion / Re: Rescue Project
« on: September 19, 2019, 08:18:55 AM »
The addiction has taken over!!!!!

53
General Discussion / Re: Prusa I3 V2 X-Min wire path
« on: September 19, 2019, 08:17:30 AM »
I've had difficulty getting the Z limit switch properly aligned. Recently switched to the magnetic flex metal build surface and needed more adjustment than available. 3D printed a plate for the Z limit switch and switch mount. The lever arm on the switch with hitting the sliding metal block on a edge. Just looked wrong. Planing on adding some sort of adjustment mechanism with a set screw.

54
General Discussion / Re: Greetings, and some assistance please
« on: September 18, 2019, 08:00:06 PM »
Is your post two pictures of the same etching or did it behave the same on separate burns?v Is the finished height correct?


The list of possible causes is quite long:
  Host OS
  USB
  Software
  Firmware
  Power Supply
  Bad wiring
  Diode module
  Belts
  Wheels
  Rails
  Misaligned carriages
  Phase of the moon

I think I have experienced most of the above since I started etching about 3 years ago. The hardest to find was the misaligned carriage. Had one wheel spacer wrong.

I would start by getting or generating some test patterns of similar size. A simple vector style X/Y cross hatch in gcode would be a small file and would test the rails, wheels, and belts without and host application. Then I would convert that that to a raster image file and try again with T2, There have been a number of test patterns posted on this forum. If you need/want help just ask.

Colored cardstock is a great test medium. Cheap and burns with low intensity. I use both 4x6 inch index cards and 8.5x11 inch sheets, Available in almost very stationary or craft store. I also have a stack of scrap cardboard just for this purpose.

55
General Discussion / Re: laser venting
« on: September 18, 2019, 07:17:25 PM »
What would be really neat is to build a vent to the local fire station and start etching some exotic woods.

56
Trouble Shooting / Re: 2.5W diode TTL wiring help
« on: September 17, 2019, 10:54:14 PM »
They should not change the intensity. What they do is keep the laser OFF until the CPU has initialized the interface which can take up to 2 seconds. The intensity is determined by the PWM (Pulse Width Modulation) HIGH time relative to its duty cycle. If the duty cycle is 1000 usec and the pulse width is 250 usec you have approximately 25% power. It is not linear and the effective burn is very much dependent on the medium, focus, and speed. GRBL typically uses a value of 0 thru 255 and in firmware scales it to the configured range.

57
Trouble Shooting / Re: Newby problem
« on: September 17, 2019, 11:21:27 AM »
There are three major components that need to play nicely:
  1. Hardware
  2. Firmware
  3. Host application

Please supply a few details of your setup. perhaps a picture or two.

Did you adjust the driver current limits?
Do you have a lower power switch on controller and/or laser module?

58
Trouble Shooting / Re: 2.5W diode TTL wiring help
« on: September 17, 2019, 08:56:24 AM »
That opens another possibility. Use the 3-pin headed for connection to the controller and solder the resistor to a 2-pin connector and insert in the 2-pin header. Sad situation where the manufacturers overlook a $0.02US solution.

59
Trouble Shooting / Re: 2.5W diode TTL wiring help
« on: September 17, 2019, 08:44:42 AM »
The first three should do. If you have an Ohm meter you could measure between the TTL- and GND. I suspect (hope) they will be the same.

60
Trouble Shooting / Re: 2.5W diode TTL wiring help
« on: September 17, 2019, 08:22:51 AM »
This is a well known problem. The laser ON state is active HIGH and the PWM line floats high without an active drive. Solutions is to add a pull-down resistor between the PWM and GND. I use 3.3K but almost anything between 1K & 10K should work. You can solder the resistor on the laser module, on the controller, or on the cable. I prefer the the laser module as then it is protected if the PWM is disconnected. Advantage to putting it on the controller is you can reliably swap laser modules. Perhaps adding  4.7K to both the controller and the diode is best.

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