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Messages - Zax

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Projects / Re: Slate Coasters
« on: September 23, 2018, 04:28:16 AM »
Welcome to the SEA* club. Those are excellent examples and sure to infect others.

* Slate Engravers Anonymous

Engraving / Re: Engraving on Ultra-Thin Veneer
« on: September 20, 2018, 03:20:15 PM »
It shouldn’t be difficult to cut, as long as you have a 1.6W or higher laser.

You may also want to look at birch laser ply, it has several layers bonded with a water based epoxy. I can cut that in 3~4 passes with my 2.5W. It also engraved nicely too. The only negative is it isn’t cheap.

FAQs For New Users / Re: Setup for basic system
« on: September 20, 2018, 10:14:14 AM »
In my experience the 2.5W lasers are good for engraving but limited to thin cutting. More important than power for engraving is the focus dot size and for cutting the depth of focus (unless you plan to have a Z-axis).

I would recommend an outside vent for cutting, but for engraving you probably don't need it.

I use an aluminum honeycomb for cutting, also air assist will help you to cut thicker material.

Engraving / Re: Slate?
« on: September 19, 2018, 05:08:15 AM »
That's really nice, great job!

I don't think you have a hardware problem, it's a parameter / settings issue.

General Discussion / Re: Burn size
« on: September 19, 2018, 05:06:50 AM »
Benbox may be capable but it will only work with their modified Grbl 0.8, so your machine performance is going to be slow. Grbl 1.1 has faster and smoother motion control, not to mention the real time overrides and other features like homing.

Since it's not turning on full power, my guess is your spindle (laser) max parameter in firmware changed.

T2 Engraving / Re: Power went out mid burn...
« on: September 18, 2018, 09:23:55 AM »
If you know where it should be (position), you can easily set that using G92. Then (leaving the header intact) you could remove all the lines that have completed. This probably wouldn't be a perfect result but probably the best you can achieve.

General Discussion / Re: Understanding pixel in relation to size.
« on: September 18, 2018, 05:14:50 AM »
It depends on your settings, but the default in T2Laser is to import using the resolution.

So if you use a resolution of 0.2, that means you would need 5 pixels for each mm. So an image that is 1000 pixels wide would be loaded as 200 mm wide. Use 0.1 for resolution and now you need 10 pixels per mm so it would import at half the size or 100 mm wide.

Since many programs use dots per inch (DPI) you can convert the resolution.
e.g. Resolution = 0.2, 1/0.2 = 5 and 5 * 25.4 = 127 DPI

If you are saving in Photoshop for example and specify a real world size, use a DPI that matches your resolution and it will import as expected. The alternate is to enable Use Image DPI in the Settings / Image Options menu, then T2Laser will set the resolution automatically to match the image DPI.

Engraving / Re: Request for Assistance on a Big Project
« on: September 18, 2018, 05:03:48 AM »
It looks to be wheel related to me, backlash would occur on both circles.

General Discussion / Re: vector vs raster
« on: September 18, 2018, 05:02:03 AM »
Sounds about right, I probably had rapid set to 2000.

Is this a 2 wire laser connected to the "motor" port or a 3 wire laser on the "laser" connector?

The 2 wire uses the MOSFET to switch the 12V ground so that may be the problem, you can check the gate voltage.
The 3 wire doesn't use any power transistor or MOSFET, it's connected directly to 12V and the Nano TTL output.

Engraving / Re: Request for Assistance on a Big Project
« on: September 17, 2018, 05:26:34 AM »
It looks improved but you should get perfectly concentric circles, I see you have some gaps too which may indicate lost steps. This can be caused if the belts are too tight or you have some friction in the wheels, also have you checked the motor driver current?

Engraving / Re: Request for Assistance on a Big Project
« on: September 16, 2018, 03:41:55 AM »
That's a mechanical issue, most likely backlash which is from the belts being loose. It could also be some wobble in the wheels (carriage or gantry).

General Discussion / Re: vector vs raster
« on: September 15, 2018, 11:37:25 AM »
I set resolution to 0.1 (only used for sizing) and loaded the image.

It's 74 x 74 mm.

Using 1000 feed rate with no hatch I auto-traced and it is 1 min 22 sec to engrave.

The same settings with hatch at 0.15 is 6 min 25 sec.

It's just under 10 minutes without using DXF optimizer.

Try it again, change the settings and load the image. Then with hatch off try auto-trace and see if you get ~1 minute.

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