MB3 - Laser module connection

[Weerasak]

Chinese Laser module connection



After hacking, you can connect MB3 output to TTL PWM directly.

Y316 -> PWM
24V -> 24V
0V  -> GND

[AndyInPattaya]

Hi K. Weerasak,

For some reason I can't see the picture in your post. I was unaware that the ESS-MB3 could provide a PWM for a laser. What is the hacking that you refer to?

I have a Laser Tree K30 and the biggest issue seems to be that it doesn't have a Gate input. So I designed a circuit which can provide a 4kHz PWM, using either the 0-10V spindle output or a pot to control the duty cycle, but it also has a 24V Gate input which can be switched from the ESS.

[AndyInPattaya]

I just figured out how to post pics here, so here's the schematic...

[Weerasak]

Hi Andy,

The picture link was fixed. But the attached PDF will give you more detail on where to cut the PCB track.

I think using analog output 0–10 volts will work only for cutting purposes but won't work with picture engraving because it needs a high-speed signal to turn on or off the laser dot while moving across the target.

I assume that direct PWM control from ESS/MB3 will work perfectly for both cutting and engraving. The circuit in the first post should work with Laser Tree K30 as well.

**Note, 1K resistor in the circuit is a must.

[AndyInPattaya]

Raster imaging is not going to be part of my workflow, everything will be vector cuts or etching.

I've just got my MB3 nicely installed so I don't fancy ripping it out again and hacking the board!

My reasoning was that the AO signal (or the pot) would provide a constant power setting and then use the Mach 4 laser on/off signal to drive the gate. Maybe the AO will not work but an independent PWM definitely will.

Anyhow, I'm concentrating on getting my router machine working first - the laser can come later!

[Starfire2038]

Chinese Laser module connection



After hacking, you can connect MB3 output to TTL PWM directly.

Y316 -> PWM
24V -> 24V
0V  -> GND

Weerasak Thank you so much, I had a feeling that might be the issue, But I'm a novice in that field.  What do you recommend I use to cut the PCB Track.

[Starfire2038]

Weerasak, Want to to thank you so much for your help. The work around did the job. I am now able to test fire laser.