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Messages - Zax

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1
General Questions / Re: What information do we have on these boards?
« on: July 20, 2021, 08:52:16 AM »
The defaults are what you want:
Microprocessor = Nano
Postprocessor = Grbl

The configure Eleks Mana menu is only applicable to the Eleks 0.9j firmware and only necessary if you need CoreXY or Servo (which 99% of people do not).

2
General Questions / Re: What information do we have on these boards?
« on: July 02, 2021, 04:17:59 AM »
The 0-1000 or 0-255 make no difference to the output, it's still an 8-bit PWM so 0-255 no matter what input value is used. Resolution or granularity of the signal doesn't change.

You can use 0-1000 or any max number you like within reason on any firmware by changing the Grbl parameter ($30).

The difference with the high frequency firmware is it uses a 7.8kHz PWM instead of the usual 1.0kHz, so you get a much shorter pulse width that repeats much more often.

I would get a replacement Nano and swap it out, that may resolve your issues.

3
T2 Engraving / Re: Laser quit burning
« on: June 15, 2021, 05:10:10 AM »
Does the control board have a 3-pin laser output?

The older 2-pin does not have a TTL signal which is required for most laser modules, so either you can manually wire it to D11 on the Nano or get a replacement controller as well as a new laser module. The controllers are cheap and then you would have spare stepper drivers.

4
General Discussion / Re: Wish me luck!!!
« on: June 08, 2021, 05:11:31 AM »
I guess that's the newer version, and new higher price too.

If you are essentially putting a standard frame into the enclosure it would make more sense to use standard cables and an Eleks or Cronos board.

How do you adjust the focus (Z-axis)?

On my old K40 I installed a motor on the Z-bed so I could focus in T2Laser (that's where the Z-focus feature came from) but of course it had very limited XY size.

5
General Discussion / Re: Wish me luck!!!
« on: June 07, 2021, 10:07:48 AM »
There was an alternative to the Cohesion that was also a drop in replacement but half the price, not sure if that's still available or what the current price is. If I remember it was an Australian supplier but they had a US reseller, I want to say it was called the mini-Grbl or something like that. I just used an Eleks controller and removed the connectors from the old board, more work but very cheap solution.

6
General Discussion / Re: Wish me luck!!!
« on: June 07, 2021, 04:16:58 AM »
That's genius. It's about time they changed the K40 design, it's been basically the same for well over 10 years (I got mine in 2008).

7
General Discussion / Re: Wish me luck!!!
« on: June 06, 2021, 03:38:45 AM »
I miss my K40, makes these diode lasers seem like toys.

12" x 24" sounds like a great mod as size was really the only limitation.

Do you plan on a Grbl based controller or something else?

8
BenCutLaser / Re: eleksmana v5.2
« on: May 16, 2021, 03:49:35 PM »
I prefer the EleksMaker laser modules, 2.5W for engraving or 5.5W for cutting. The NEJE, AtomStack and Ortur modules sold as "30W" which is approximately 5.5W output are popular alternatives but you may sacrifce some lifetime. There are other generic modules that are cheaper but quality is varied.

9
BenCutLaser / Re: eleksmana v5.2
« on: May 16, 2021, 01:12:43 PM »
The voltage should be constant, it isn't switched. The TTL/PWM is what controls the output.

If you are getting 15VDC on the LD output then the laser diode would be fried as the voltage from the constant current driver is supposed to be around 3.5~4.9VDC.

10
BenCutLaser / Re: eleksmana v5.2
« on: May 16, 2021, 10:18:21 AM »
+ should be 12VDC relative to GND but as the power supply is unregulated it could read 15VDC without a load, that's normal.
The signal (S) pin is a PWM TTL output.

Are you saying the signal pin has 15VDC or the +?

11
Mini CNC / Re: Idea to set constant z axis bit hight?
« on: May 15, 2021, 05:38:31 AM »
Yes that's what I do, just move Z to the height of the block and change bits.

12
Engraving / Re: painted metal
« on: May 02, 2021, 02:02:43 PM »
It depends on the wavelength of the laser, typically a CO2 will remove the pigment and leave white whereas a diode will just remove the surface. If you paint them white and then dark green you'll be able to remove the top layer revealing the white.

13
General Discussion / Re: cnc lofi!
« on: April 30, 2021, 12:21:14 PM »
Its been more than quiet. I miss being able to ask a technical related question and get a good discussion.

Agreed. Ralph did such a good job keeping the forum "clean" of spammers and other junk posts.

14
General Discussion / Re: Etching Ceramic Tile
« on: April 26, 2021, 05:01:22 AM »
On tile I use 2 or 3 very thin coats and allow it to dry between applications, it gives a more consistent result than trying to cover the tile in a single thicker coat.

Using a resolution of 0.05 means the laser is passing over the same area 3 times, slightly offset each time as the beam is probably closer to 0.15 or more. I prefer to use a more practical resolution value that matches the spot size and reduce the feed rate but I know your method is also popular and I have seen some very good results.

Metal may not provide the same results as ceramic (tile) as the metal will absorb much of the energy (heat) and dissipate it before it can ablate the paint.

15
Assembly Help / Re: Wiring home switches
« on: April 23, 2021, 06:03:28 AM »
In T2Laser you can enable the switches from the settings menu on the laser controller screen, but how they function is largely determined by the firmware although there are some parameters you can change (such as homing direction, feed rates and pull off distances).

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