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Thanks a lot !

Yeah it's way more simple :banana:

Well, I bought another laser cutter that have a water flow sensor ... ;)

Hello everybody !
I have a 3040 CNC that works well and I want to put this on it :
http://www.cnczone.com/forums/attachment.php?attachmentid=371130&stc=1
I have this motherboard :...

I may be wrong but it seems that you must correct the path of your laser beam, it's just a question of compromise beetween the two distances.

you're welcome ! ;)

here is some explanations :

Frequently Asked Questions about CO2 laser lenses for cutting

There is a lot of things that can affect the power of the laser beam, here is some:
The path of the laser is not perfect.
The mirrors are dirty.
The lens is dirty.
The distance between the lens...

30,8 for the lens (or less is better)
and the distance is also important of course !
;)

I think that the problems is the optics , your laser beam seem large so I think thath it's not concentred enough, you may verify that !

It seems that your laser beam is not centered and reflect inside the head(on the metal of the head I mean)...
Please verify your laser beam path, i'm not sure, but I had the same problem and it was...

http://www.cnczone.com/forums/attachment.php?attachmentid=268012&d=1423461701

it was the final diagram, I hope it will help you... good Luck ! ;)

I think you should look at the lens , the mirrors(maybe dirty) and the path of the laserbeam that could be not really good !

At the begining I had the same problems, after cleaning the lens and...

It's not really a problem that I have, it's just that I would like to know, what the screw on the laser tube are made for ?
http://www.cnczone.com/forums/attachment.php?attachmentid=288204&stc=1

I'm not an expert ,but you may take a look at the end-stops.

I've just ordered those one :
Wholesale Product Snapshot Product name is 12mm CVD ZnSe Focus Lens 10600nm 1.06um CO2 Laser Engraver Cutter FL=1.5'/38.1mm

It's not really a problem with moshidraw, if it's a china k40 you may have a 700mm laser tube , if it is, so it's certainly a 32 w not a 40w(so cutting a 4mm plywood will be difficult), then the...

Here is another information.

There is some problems with the plugin and moshidrawX(2015), you must use the latest version of moshidraw 2014 or the plugin may not work !

Yes all version of windows if it's a 64bit version. I've just spend the afternoon to re-install win 7 32 bit just for the moshi plugin.

Chinese are very strong in electronics, machines etc... but...

Moshidraw can work on a 64bit OS but not the plugin.

I'm just spend the afternoon installing a 32 bit version of windows 7 because of that !

I Don't know about your second question but for the first one it's simple.
You must launch moshidraw and coreldraw , inside moshidraw you will find a menu with "link with coreldraw ", click on it ,...

You can also change your focal lens. Usualy laser engravers coming from china often comes with a "standard" 50.8 mm focal lens.

If you put a 38.1mm focal lens you will concentrate more the...

Plywood in France is quite the same as everywhere, I cut "normal" plywood made with wood layers and glue ! Plywood is universal....

The video isn't mine it's just to show how to fiind the best...

Still a joke !!!
The more you use power the less time your tube will live !
I cut 5 mm plywood at 8mm/s and 48% of power
3 mm plywood at 22 % power and 13mm/s

When I look at your numbers it...

I agree with mondo50m, and I can say also that air assist helps to protect the lens from smoke.
To cut 3mm plywood you also need to find the good distance from the head to the material and verify...

18mm Laser head w/ air assisted. Ideal for K40 machine

You can also print it woth a 3d printer, make a search on thingiverse.

and for the focal lens you can find on aliexpress or alibaba or...

WRONG !! I cut 5mm plywood with 50w laser , moshisoft motherboard and moshidraw.
K40 can cut 3 mm plywood if it have a good focal lens !!!
80 W to cut 3mm plywood ??? it's a joke ! with that power...

What focal lens do you have ? certainly a 50,8, if it so , change for a 38,1 it will more cocentrate the laser beam.
You may also take a look of your laser beam path.

What is your laser lens focal ? certainly 50,8
Change for a laser lens with focal 38,1, it will do a better concentration of the laser beam. With a 50,8 I was unable to cut 3mm plywood, with a 38,1...

You should check if mirrors and lens are clean and also the light path:

https://www.youtube.com/watch?v=MfBOWSUqDU0

or

https://www.youtube.com/watch?v=VWVLeXjXr9U

You can loose 90% of the...