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Messages - ggallant571

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General Discussion / Re: GRBL G00 and laser
« on: July 02, 2020, 11:46:43 AM »
I have (I think) laser mode enabled $32 = 1.

General Discussion / GRBL G00 and laser
« on: July 02, 2020, 10:49:14 AM »
I thought that the laser isalways  turned OFF during G00 motions.

General Discussion / Re: Scratch paper
« on: July 02, 2020, 06:42:31 AM »
I also had no idea the stuff existed. One package I got on Amazon. 50 sheets for $16US. The others from a local craft shop at $8US for 6-8 sheets. The Amazon sheets are about 20mm smaller in both width and height plus quite a bit thinner. Very different inks and results. I'm experimenting with the cheap stuff.

Getting the burn recipe correct so far has been tricky. On some images a 2% change in power makes a huge difference in results. On others 10% means nothing. Be great to have others involved, especially if there was a science person who could give explanations for the process or an artist who could give reasons why the result was appealing (or not).

As a word of caution, the paper scratches quite easily. Avoid bending as the inks appears subject to cracking. I'm thinking of 3D printing a frame to hold the paper.

General Discussion / Scratch paper
« on: June 30, 2020, 07:30:18 PM »
I have been experimenting with burning images in scratch paper. Scratch paper consists of 4 layers, paper, clay, crayon, ink. Normal use is using a scratch tool remove the lop layer of India Ink exposing the colored layer below. Some users on a Facebook page tried using a laser with fairly good results. I think most use a CO2 at high speed and very low power at a 600 DPI resolution.

I tried with a 2.5W diode laser. The trick is to apply enough energy to burn the ink but not touch the crayon. Got acceptable results when I filtered the black pixels to be 1 out of 4 with a speed of approx 3400mm/min and a power of 90 out of 255 on the thinner brand of paper and a power of 150 on the thicker paper (ink seems to be different).

I suspect that part of the problem is I do all burns at a 0.1mm resolution and that the grid scheme effectively changed that to something close to 0.20 in X and 0.14 in Y. I also means that the laser is only driven On for one pixel (0.1mm). I need to do the math and tests but suspect that the laser is not fully ON before being turned OFF. Question is how to quantify and control that process. What test patterns and materials can be used? Is there a difference between running that laser as a raster and firing while in motion vs coming to a stop and pulsing the laser.

There are two goals in this quest. First is to making the underlying colors more vivid. Second is to learn how mathematical transforms (filters) affect the end result. After laser etching for almost 4 years (mostly slate & 2 tone wood) I feel like an absolute beginner. I don't know the art, math, or physics necessary to get repeatable results. If there is any interest we could create a category here specific to this technique.

I purchased 4 different brands/type of paper. Have only experimented with two. Both were "rainbow" crayon layer. Attached is picture of first success. BTW - looks much better than the picture

Engraving / Re: Laser turns on but wont burn
« on: June 30, 2020, 01:46:11 PM »
Zax - you still in England? It could have +12 from a power supply, PWM from a controller, and common grounds.

Engraving / Re: Laser turns on but wont burn
« on: June 30, 2020, 11:17:48 AM »
Is the laser side two 2-pin headers (4 pins in total). One labeled +12/GND and the other PWM/GND?

T2 Engraving / Re: Feed rate - units question.
« on: June 28, 2020, 02:49:23 PM »
You can play with the GRL parameters and set your units to mm or inches. 300mm/min for single pass thick paper cutting sound reasonable. Try some simple test patterns for dimensional accuracy.

T2 Engraving / Re: Feed rate - units question.
« on: June 28, 2020, 07:10:18 AM »
What you use for feedrate and power is dependent on your laser and material being burnt. Slate is quite different from paper and black paper is very different from white.

FAQs For New Users / Re: Software Problem
« on: June 28, 2020, 07:07:19 AM »
There are approximately 1475 similar posts on this forum about benbox software. Generic solution is to install generic grbl firmware and one of the reliable host applications such as T2 or BCL. Both have free trial options and infinitely better support.

FAQs For New Users / Re: Software Problem
« on: June 24, 2020, 09:27:12 PM »
The bits responsible for controlling a laser are analogous to human mussels. If you don't use them they lose the ability to do work. I suspect you bits have suffered a similar fate. I've heard rumors that COVID-19 is accelerating the process. Did you cover the  air intake ducts with a certified mask? Did you let your PC memory get within 6 feet of a MAC? Did you threaten Windows with being replaced by Linux?

EleksMaker Mana SE / Re: Another TTL Module Question
« on: June 22, 2020, 09:56:32 AM »
I have a couple diode lasers with the two 2-pin headers. Made a cable that mates with the 3-pin header on the controller and at separates into the two 2-pin connectors at the laser end. Soldered the GNDs together near the laser end. On one module the internal GNDs are connected, on the other isolated. Cable works with both.

A 5W diode module requires more current than a 2.5W. Make sure your power supply is sufficient.

Kits / Re: 3018MAX
« on: June 19, 2020, 08:21:22 PM »
It is my opinion that:
  1. Laser diodes are sorted by quality by the manufactures. The best go into medical/scientific
      products, the OK go to industrial, the reset go to hobby.
  2. Chinese mass marketing is all about who can tell the most exaggerated tale.

Are you looking for a diode etcher or another 3018 style fixture?

General Discussion / Re: New wheels
« on: June 19, 2020, 08:11:52 PM »
Thanks. I brought it in at 254dpi. Immediately exposed a flaw in my algorithm. It needs a boarder around all shapes.

General Discussion / Re: New wheels
« on: June 19, 2020, 11:43:25 AM »
What is the DPI for this image or what is the OD in mm of the ring on the lower right?

General Discussion / Re: New wheels
« on: June 19, 2020, 09:23:18 AM »

This effort started when I wanted to cut/etch multi layer laser cut/etch projects. Not sure of the proper name but I take an image and cut into layers where the shapes needed to be propagated. Either as cutouts or stacked.

With my limited background and tools I worked with GIMP. This particular endeavor did not require any kerf compensation. Wrote a png to svg utility that took a single png file and output multiple svg files. Used reserved colors. Somewhat frustrating design process but it worked. BTW - this all started due to posts from a couple of benboxlaser forum members.

Next project was to create inlays. Being lazy I used the previous work flow but now needed kerf compensation. First pass was to decrease the size all the inside parts via the GIMP shrink option and run thru the png2svg utility. Again it worked but the compensation was now generated at design time.

Current effort is to add a GUI option to the host application where I can assign the kerf compensation at burn time. As previously stated my background has zero art and very little CNC training. I am also located in the low tech capital of the world. No local resources!!!

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