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Messages - ggallant571

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1
Engraving / Re: Slate?
« on: September 20, 2018, 11:51:31 AM »
My working wage is more like $0.17 / hr. I sell the slates thru a local craft shop and give away to friends, family and charities. They get $10, I get $7.50. If I sell approx 800 more I will break even on laser toys (tools) assuming I stop building fixtures and trying new media.

2
Engraving / Re: Slate?
« on: September 19, 2018, 06:29:31 AM »
Looks like wveagle81 has the LEB (Laser Etching Bug) real bad. No known cure.

3
+5V (or 4.2) is what enables the laser. The CPU turns it OFF by pulling the line low. If the input on the laser is left floating it will be ON. There is an ongoing discussion of this issue. Simple solution is a 3.3K pull-down resistor. Also keeps the laser off during cpu reset.

4
Engraving / Re: Request for Assistance on a Big Project
« on: September 18, 2018, 09:04:54 AM »
Attached is a test gcode file. It does a square, rounded square, circle, and triangle. Outer rectangle is 90 x 90 mm.I have it set at a burn speed of 1200mm/min and a power setting of 100 out of 255. You can use a text editor to adjust to you liking.

Notes:
   1. The triangle is not a perfect equilateral!!
   2. Exposes some minor problems with my 2.5W fixture.

5
General Discussion / Re: Understanding pixel in relation to size.
« on: September 17, 2018, 08:51:27 PM »
I use linux with home-brew host burn application that expects the image to be imported at 254 dpi. I typically use GIMP as the  image editor. I set/scale the image to fit the target media.

For instance, when etching  slate 100x100 slate tiles I know that the max image size is 80x80 so I scale everything to 800x800 pixels. Then before exporting the image as a png file I set the canvas size to 1000x1000, center the image and erase the borders. A resolution of 0.1mm is overkill for wood and leather but great for slate and mirrors.

T2 has many more options but I have settled into a work flow that produces predicatble results.

6
Engraving / Re: Request for Assistance on a Big Project
« on: September 17, 2018, 08:26:20 PM »
Please post the design files.

Are the circles done with gcode arcs?

I would expect a busy 100x100mm image to take about 25 minutes. I cleaned up your png to remove some of the background color (wood)  and scalled to 100mm size. Etching on cardboard at 1200 mm/min. It has taken 15 minutes to etch about 50%.

7
General Discussion / 15 watt laser
« on: September 17, 2018, 08:31:03 AM »
I have purchased the components to build a 15W laser with linear slides. Two questions / concerns:

1. What do they mean by 50% duty cycle? Max PWM of 50% or run for 5 minutes and off for 5 minutes?
2. I am wondering if the HOME switch movement should be with no micro stepping to avoid the motor starting at a full step position.

8
Engraving / Re: Request for Assistance on a Big Project
« on: September 17, 2018, 08:26:17 AM »
There are 3D printable belt tension adjustable fixture. Have a set on my A5 machine and they work great. I can deflect the belt about 3mm (0.125 inch) between the wheel and the gear. Disconnect the wires to the motors and you should be able to move the carriages by hand. I use a 100 x 100 mm square  and  a 50mm diameter circle to verify the operation.

9
Engraving / Re: Request for Assistance on a Big Project
« on: September 17, 2018, 06:38:11 AM »
It is much easier to tune a laser fixture using simple squares, circles, & triangles. I prefer the gcode versions where I specifically set the sizes, speeds and power.

10
Trouble Shooting / Re: Wire management
« on: September 15, 2018, 07:01:31 AM »
What a drag!!!

11
Engraving / Re: Request for Assistance on a Big Project
« on: September 14, 2018, 09:39:13 PM »
Attached is a somewhat cleaner file. Made some of the wide lines thinner and some of the very thin lines wider. Etched with 2.5W laser at 1200mm/min and full power. Attached picture.

When etching slate I use a sealer. Improves the contrast. Makes the unetched surface darker. Takes a couple of days to fully dry. I also wash and scrub the slate prior to sealing. Takes time but the results reflect the effort.

12
General Discussion / Re: vector vs raster
« on: September 14, 2018, 07:47:39 PM »
I raster burned the image on scrap high quality plywood in just under 9 minutes with:
    Laser                  2.5W
    Traverse rate      1800 mm/min
    Burn feed rate    1200mm/min
    Resolution          0.1mm

Result was quite nice. Perhaps a little darker than necessary. The feed rates could be higher.

BTW - what type of fish is it?

13
General Discussion / Re: vector vs raster
« on: September 14, 2018, 04:24:39 PM »
Looking at your image I would guess that converting to vectors would be a waste of time and sacrifice quality. My general rules for etching are minimum line width is 2 pixels and spacing is 4 pixels. There are a number of places in the fish that do not meet these guide lines. It is all a mater of taste when dots are missing for bleed together.
 

14
Engraving / Re: Request for Assistance on a Big Project
« on: September 14, 2018, 09:10:28 AM »
Image is not ready for burning in wood. The heavy lines are too much. Etched on 2.5W at 1000mm/min full power. Changing the intensity of the heavy lines would probably work ok for wood but not for slate.

15
Engraving / Re: Request for Assistance on a Big Project
« on: September 13, 2018, 11:47:31 PM »
Attached is my stab at the operation valor emblem. Currently etching on scrap wood so I don't know how it will look. I sized it to fit the 100x100 mm (4 inch) slate or mirrors. The are a number of quite fat lines that probably will not etch well in slate. If anyone does use it and does some improvements, please post your work.

Image is 254 dpi.

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