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Messages - ggallant571

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T2 Engraving / Re: Bluetooth connection
« on: September 16, 2019, 10:52:50 AM »
There is an active github group (grbl_esp32) that is working towards a wifi and bluetooth solution. I built a simple PCB that has an ESP module footprint on the top and a NANO footprint on the bottom. They have a web based utility similar to Universal GCODE to control the motors and feed gcode. I also build a dedicated PCB which I have only used on the laser with a USB cable connection.  Got sidetracked (again) and this project sits idle while they are advancing at a good clip. They are primarily CNC oriented with a few laser users.

General Discussion / Re: Greetings, and some assistance please
« on: September 15, 2019, 07:13:23 PM »
PWM is always active after the embedded firmware has been initialized. It could be set at 0% and look like an OFF, 2% and look like a weak laser, or 100% and look like a solid ON,

My artistic skills are in the range of zero to none and 99.9% of my etchings are BLACK/WHITE, no shades, no modes, and burned in slate. If you have some artistic talent you should think about how to use T2 as a paintbrush tool and convince Zax to add features. Then post your results.

General Discussion / Re: i will leave this here
« on: September 15, 2019, 06:54:57 PM »
I don't have any association with Endurance or any of their equipment but:

  1. If I had the need for high quality laser components I would start with Endurance.
  2. I suspect they really do want and value your opinion.
  3. They probably would like an active online community to showcase their products.

Sorry to hear they are not properly handling your situation. My personal opinion is a 5W Endurance laser out preforms a 15W EBay unit in every aspect.

General Discussion / Re: Greetings, and some assistance please
« on: September 14, 2019, 06:34:24 PM »
These 3-wire controllers and diodes have a fault on CPU reset. The CPU IO lines float high on reset. This high turns the laser on. Usually lasts for a fraction of a second which is enough to cause damage if not controlled. The "ideal" $0.02US solution is to solder a 3.3K resistor between the PWM signal and GND. This will hold the PWM low (OFF) during reset. It can be done on the laser module, controller CPU pin, either of the cable headers, or even stripping the cable.

Without the pull-down resistor you can leave the power to the laser off until the CPU is ready. This works for normal startup conditions but a reset is likely going to cause a problem.

General Discussion / Re: Prusa I3 V2 X-Min wire path
« on: September 14, 2019, 04:42:05 PM »
I don't have that exact model by mine has the limit switch and wires on top of the horizontal rails.

Laser Modules / Re: NEJE 20W Temperature sensor
« on: September 14, 2019, 11:30:07 AM »
2A at 12V is 24W of input power. I don't think a diode laser is 80% efficient (would be great if it is). I wonder if a 20W designation is a new Chinese marketing game.

Laser Modules / Re: NEJE 20W Temperature sensor
« on: September 14, 2019, 08:48:56 AM »
Please report your burning success. The specs for 12V power have some variance between vendors. Any idea what yours draws?

General Discussion / Re: laser venting
« on: September 11, 2019, 04:52:29 PM »
Welcome back!!! It has been very quite around here. Either the quality (hardware & software)  has gone up or the interest in diode lasers is fading. Very few posts about interesting projects.

I use a 4 inch (100mm) exhaust fan with flexible aluminum duct to vent the "bad" fumes. My fixture sits against an outside wall in the basement so it was quite easy to install. As I kind of like the smell of burning wood it often sits idle while etching.

General Discussion / Re: Rescue Project
« on: September 09, 2019, 09:51:59 PM »
I don't know how important it is but the person who recommended hairspray to me was insistent that it be unscented. After 2 years I am on the first can. Recently stated using the flex steel plates with PEI. Works great.

General Discussion / Re: Rescue Project
« on: September 09, 2019, 04:53:08 PM »
12V heated beds are slooooow to heat.

I always need to use hair spray on flat glass and flex metal plates.

Measure the plate temperature with an independent source. One of my printers is off by 10C at 50C. Think it can be calibrated by I just compensate.

General Discussion / Re: Rescue Project
« on: September 05, 2019, 09:44:27 PM »
What makes you think the current MOSFET's aren't sufficient? Might be easier to add additional fan and keep all the electronics a little cooler.

Cutting / Re: calibration
« on: September 04, 2019, 08:19:50 AM »
If the end use is cutting and precision is the primary concern then speed is less of an issue.

Cutting / Re: calibration
« on: September 04, 2019, 06:52:11 AM »
If you primary concern is cutting accuracy I would suggest converting to linear bearings and leadscrews.

Cutting / Re: calibration
« on: September 03, 2019, 08:26:29 PM »
I am going to try and cheat using my homebrew cut/burn Linux application. Plan is to set the steps/mm to 4X (320) in firmware and scale by 0.25 in software. The  X/Y/Z are all transmitted in floating point notation. Probably will need to fudge the acceleration and limits and adjust the phase of the moon. Might do it first on 3D printer as printing a 20x20x20 test cube is easy to measure

BTW - what machine do you have that spans a meter???

Cutting / Re: calibration
« on: September 03, 2019, 06:21:09 PM »
99% of my laser burns are under 200mm in slate or wood. Doubt I could measure the result to any degree of accuracy.

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