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Messages - ggallant571

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Cutting / Re: Recommendation Request
« on: January 22, 2019, 12:22:52 PM »
I read the product reviews specific to cutting with lasers. The only power references were to 40W and above machines. The glue is also rated for dampness resistance which makes me think it is not applicable for low power lasers.

Have you tried cutting 3mm basswood? What speed and power?

I recall there being a topic on what can be cut on this forum.

Cutting / Re: Recommendation Request
« on: January 22, 2019, 10:36:11 AM »
Are you sure the 3mm (1/8 inch) was laser plywood. Typical hobby grade glues are difficult to cut. BTW - 30 passes at 300mm/min is the same time as 15 passes at 150mm/min and might have less char. Adding air assist to get rid of the ash and setting the focal point down 2mm might also help.

Cutting / Re: Recommendation Request
« on: January 22, 2019, 08:26:33 AM »
How many passes does your 2.5W take to cut 3mm laser ply?

I have a cheap 15W and it currently has 2 major problems:

  1. The vendor specified not to operate at more that 50% duty. Very poorly defined
      expression but I expect it means they just overpowered a 7W diode.
  2. It has a very poor focus. Most of these diodes are fabricated from multiple laser elements.
      You can see the individual dots.

It will burn with a large kerf. I use the machine for etching slates with patterns that do not include fine lines and etching test images in cardboard at high speed.

The price of a 40W CO2 laser machine is less than a 10W diode laser from Endurance.  It is physically much larger and requires water cooling but is much better suited for cutting 3mm material.

Trouble Shooting / Re: Bencut - tabs and inserts
« on: January 22, 2019, 07:15:56 AM »
What format is your source fie in? Can you post it? Can you convert it to gcode?

T2 Engraving / Re: T2Laser and 15W Laser Engraver
« on: January 21, 2019, 10:00:31 PM »
I would suggest soldering between the "-" & "PWM" pads on the three pin header. That is the YELLOW & BLACK wires.

General Discussion / Re: ESP32
« on: January 21, 2019, 09:57:32 PM »
What is your scheme for power?

General Discussion / Re: ESP32
« on: January 21, 2019, 09:06:49 PM »
Are you still interested in doing an ESP32 to Nano footprint adapter board.

The NodeMCU-32S is a 38 pin device and the span is 0.9 inch. I believe the ESP32 development board is 1.0 inch as the physical board is about 29mm wide.

General Discussion / Re: ESP32
« on: January 21, 2019, 08:00:31 PM »
I suspect your first 30-pin board is 1 inch wide. I was going to use it if I made an Esp to Nano adapter board. My 38-pin ESP32 boards are not due for another 20 days so I might do it anyways. Are you still interested?

General Discussion / Re: ESP32
« on: January 21, 2019, 05:51:53 PM »
1. Moved the step, dir, and limit switch I/O pins  to makes cleaner layout. Easy changes to GRBL.
2. Used a dual range voltage regulator with a jumper to select either 3.3 or 5.0V.
3. With ESP32 I drive the steppers with 3.3V. The ESP is NOT 5V tolerant!!

Attached are my current schematics. Has not been verified or tested in any manner!!!

Projects / Simple f18 etch
« on: January 21, 2019, 10:07:15 AM »
Attached is a simple etchable F18 image. Sized for 100x100mm slate at 254dpi resolution

General Discussion / Re: ESP32
« on: January 21, 2019, 08:50:42 AM »
I am in the similar position. Decided to make a board with both the 38-pin ESP32 and 30-pin Nano footprints. I suspect your scheme is easier, especially as it mates with existing controller boards. You probably need to augment the logic (3.3V) power supply. There is an older post on the ESP32 group about someone who was porting the 38-pin ESP module to the Nano footprint. Never heard the result.

For those who are unfamiliar with the ESP32 footprints there are 6 pins on the 38-pin modules that are also used to access the onboard flash memory which is used for program execution. If your program is small enough to fit in the cache memory it might be OK to use them. Otherwise crash.

Trouble Shooting / Re: Laser Continuous open.
« on: January 20, 2019, 09:56:35 PM »
If it is the 3-wire type you could rig a cable with +12V,  GND and PWM signal. With just the +12V & GND attached the laser should be on. Grounding the PWM wire should turn it off.

T2 Engraving / Re: T2 Laser help with greyscale
« on: January 20, 2019, 01:42:47 PM »
I have had good results with 1/32 birch plywood available at Michaels and other craft stores. The lower power setting have little effect but the middle has more. Stainng or applying a pre-stain reduces the effective range. You also have to play with the burn speed.

Trouble Shooting / Re: Laser ALWAYS ON and burns too heavily
« on: January 20, 2019, 08:15:53 AM »
If it is a 3-wire setup you could this behavior with a broken PWM wire from the controller to the laser module.

T2 Engraving / Re: T2 Laser help with greyscale
« on: January 19, 2019, 05:36:21 PM »
Did you stain or otherwise prepare the wood? Shading is very much medium dependent.

I don't understand 0 acceleration. Is it a grbl feature to not do the acceleration profile?

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