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Messages - ggallant571

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1
Engraving / Re: slate and remembering settings
« on: September 21, 2020, 06:15:47 PM »
For slate I do 0.1 resolution at half your speed. I tend to think of etching slate as creating a series of small explosions that crack the surface of the rock. I purchase slate from michaels,com for about $3.50US per pack of four. Order $50US and get free shipping. Order exactly $50 and get 20% off which bring the price down to $40 and negates the free shipping. Shipping is $8.50 per 4 pack. I have about 200 slates in the basement.

2
Trouble Shooting / Re: Stepper motor weird noise. Like stuck.
« on: September 14, 2020, 10:35:02 AM »
Stepper motor driver chips typically have a max current adjust. Set too high and the motors can overheat. Set too low and the motors can stall.

Does you problem occur everywhere or at specific points? Does it loose position or recover? Does it happen with and without laser working? Suggest you generate a test pattern that demonstrates the problem at its worse.

3
T2 Engraving / Re: Loss of resolution
« on: September 11, 2020, 09:09:48 AM »
Its should be a glass lens.My guess would be some sort of solvent that dissolves oils. Perhaps a before/after test burn on the same material.

4
T2 Engraving / Re: Loss of resolution
« on: September 11, 2020, 08:12:32 AM »
I find it useful to have "generic" test patterns. The one I am currently using does lines at different spacing (0.10, 0.15, 0.20mm).

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Having the start/end points offset mean I can see the line gaps with a microscope. Do this for both horizontal and vertical burns at various speeds and power. Currently it is hard coded into my host burn application. Probably could dump the gcode to a file but you would need to manually edit for your environment.

Diode lasers do expire. Suspect the hobby grade have a relatively low life expectancy. I have 3 dead ones!!

Does leather emit an oily smoke? Have you cleaned the lens?

5
What Can Be Cut? / Re: 1/8 inch (3mm) thick white acrylic
« on: September 06, 2020, 06:30:00 PM »
That was my experience. I bought intending to cut 3mm clear acrylic for robot parts. Still haven't been cut. Got sidetracked by laser etching and writing a Linux laser control burn utility. BTW - that robot project is sitting in a project box awaiting legs!!

6
What Can Be Cut? / Re: 1/8 inch (3mm) thick white acrylic
« on: September 06, 2020, 05:11:01 PM »
That was the reason for me purchasing a 5.5W diode laser 4 years ago. This forum set me straight. I have had some success with a 40W CO2 machine.

7
FAQs For New Users / Re: Straight to T2?
« on: September 04, 2020, 07:40:34 PM »
1 - these are incredibly simple machines with readily available replacement parts.
2 - 99.9% of us had no prior experience with laser etcher prior to our first kit.
3 - 90% of us had minimal art or image manipulation skills.
4 - The instructions and included software are probably worthless.
5 - You came to the right place to start.
6 - Check if there is a Maker Space or Men's Shed in your area.

8
Trouble Shooting / Re: Low power when jogging still burns
« on: September 04, 2020, 07:14:23 PM »
Could be a poor connector or broken wire. I attach the cable at the laser end so that the movement does not flex the connector. Broken more than one solder junction.

9
Trouble Shooting / Re: Low power when jogging still burns
« on: September 04, 2020, 05:50:13 PM »
Everything looks ok to me. When the controller is reset on does the laser come on for about 0.5 seconds? Is the laser on when idle?

10
Trouble Shooting / Re: Low power when jogging still burns
« on: September 04, 2020, 12:10:09 PM »
I suspect if you disconnect the S wire the input will float high and the laser will turn ON. It needs a pull-down to default to OFF.
Please post your GRBL parameters.

11
General Discussion / Re: Rebuilt my Laser
« on: August 31, 2020, 12:17:10 PM »
Rotating the motors by hand turns them into generators. With fast motions you could damage the driver. Try removing the stepper motor driver boards.

12
General Discussion / Re: Lens Test
« on: August 25, 2020, 04:27:06 PM »
I think it is better for a very limited Z distance. Either side of ideal it gets worse. I have all 3 and still prefer the 3 element lens for general work. The G2 works great on slate. The G8 didn't live up to its claims.

13
Engraving / Re: Curious about acrylic engraving
« on: August 25, 2020, 11:28:52 AM »
How do you remove the unetched material?

14
General Discussion / Re: Lens Test
« on: August 21, 2020, 09:35:53 PM »
The laser beam at best is cone shaped. The closer the diode is to the work the greater the angle. On both sides of the ideal focal point the beam widens. G2 were designed for efficiency. From what I've read the 3 element lens is about 70% efficient while the G2 is about 90%. This make the G2 good for material such as slate and poor for cutting 3mm wood. You might want to look into a G8 lens.

15
General Discussion / Re: New Member CNCDean
« on: August 21, 2020, 09:42:15 AM »
There was a long discussion about this topic a couple of years ago. I think Steve Nottingham posted a spring loaded solution.

The carriage should glide easily. There are a few different styles of wheels with different profiles and hardness. Appears that not all vendors apply due diligence in engineering the assembly.

I tried eccentric nuts with little success. Eventually settled on a dual rail system with the laser positioned between. Traded reduced etching area for stability.

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