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Topics - kibodwin

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1
Projects / 3D printed fume extractor
« on: January 30, 2018, 09:22:30 AM »
in the why did I not think of this before section;
https://hackaday.com/2018/01/29/take-a-deep-breath-thanks-to-a-3d-printed-fume-extractor/
3D printed adaptors for an inline fume extraction....
now, what kind of fan power (CFM?) would you guys and gals suggest for a K40 CO2 laser?
I think if the suggested fan works for the K40 it will also work for the 2.5W diode... so I would be killing 2 birds with one stone.
=)

2
Engraving / engraving on carbon fiber??
« on: January 23, 2018, 05:16:56 AM »
Hi,
I have been asked if it is possible to laser engrave carbon fibre... I see that several people have done so successfully online but...
I have a 2.5W and the K40, is this sufficient or do I nee 'MORE POWER' ???
I presume all we are doing here is burning the glue as I doubt these lasers can 'cut' carbon fibre..
=)

3
Inspiration / looking for elastic band gun...?
« on: January 22, 2018, 02:13:26 AM »
Hi,
I have searched the usual places but cannot find any laserable plans for a simple (or multi rubber band) elastic band gun.
Anyone have such a thing or know where I can find some?
Thanks,
Ki
=)

4
Projects / test engravings on K40
« on: November 03, 2017, 02:30:58 AM »
Here are some test engravings using the cohesion3d mini board.
https://photos.app.goo.gl/wnTz3jRGA0Jg6umW2 friends project svg logo, used ot make sure I can engrave vectors!
https://photos.app.goo.gl/gjvDTaueoJKwj8fs1 3mm mdf phantom F4
https://photos.app.goo.gl/ymHpcEuIcZDHQ0BW2 3mm mdf tomcat
https://photos.app.goo.gl/NzlzpdBRS7VTsQHZ2 test engraving on slate, would have liked better contrast but this is the back side so the front being darker should be better.
=)

5
CAD Software / jpg to vector file?
« on: October 23, 2017, 07:26:14 AM »
not sure this is the correct place to post so feel free move as necessary...
I have only recently started even trying to use graphics software so please take this into consideration...!

I am trying to convert  jpgs I have into vector files, I though SVG was the file format I needed but this crashes my laserweb on my  laptop. DXF seem to be better in laserweb.
How do you convert your pictures to vectors?
I am trying inkscape (no luck, cant get to grips with it), coreldraw (I have made better progress with this), and https://www.vectorizer.io (am getting a bit lost with all the options). I am trying the automatic mode in https://vectormagic.com
Are there any tips and trick for these sorts of conversions? When I try in coreldraw and vectoriser.io I seem to lose a lot of quality, is this normal?
=)

6
General Discussion / Something nice for the S.O.??
« on: October 23, 2017, 06:17:14 AM »
I have been engraving technical drawings of fighter jets and a spitfire and now feel I have a good grasp on the engraving that I would like to do something nice for the S.O. Any ideas? My thoughts were all pretty classic, engraving pictures of the kids, laser cutting a pencil organiser and so on but I was wondering what you guys and gals have made for your S.O.? I would like something original and different, preferably that can only be made with our machines (I have a 2.5W diode and a K40) so that I have some sort of justification for spending so much of my free time with these machines!

So that you did not read all of this for nought here are some of the things I have been engraving on the K40
=)
https://photos.app.goo.gl/zEoj8Z2QZt8Un65Z2    phantom F4 on 3mm mdf (got to love old Ikea cupboard backing!)
https://photos.app.goo.gl/U8rTKAxokrWwjYwD2  lighthouse on some slate, would have loved better contrast...
https://photos.app.goo.gl/9DTwSgaPTlBbdwZb2  wildcat (first successful test on new cohesion3d mini board) on mdf

7
Laser Safety / Fire extinguishers.
« on: October 10, 2017, 01:20:04 AM »
Whilst I am far from being an expert in these matters, I would like to remind users of this forum that these lasers will set fire to some of the materials they put under them (obviously stone will not burn but pancakes will!).
I personally have a Co2 fire extinguisher (a grey top to the extinguisher, also way heavier than the other types) handy for any electrical fires but this is not to be used for paper / cardboard fires (as the pressure will blow the embers around, spreading the fire) but do use a water foam (in Europe (mostly) a blue bottom or blue handle). These ‘blue’ water foam fire extinguishers will put out most non electrical or grease fires (and most of the stock we use under our lasers). These ‘blue’ water foam extinguishers are also useful preventively, if you ever spill oil / grease / petrol you can cover these flammables with the foam water to prevent a fire.
To use, pull the pin horizontally (they can be quite hard to remove, especially with gloves), stand around 4 to 5 meters from the fire and aim at the base of the flames. Keep going until there is no more smoke or embers. Then give it a bit more to make sure. Be sure to also hose down anything flammable nearby to prevent the fire spreading.
Understand that once you start putting out the fire you will get steam and smoke, more than when the fire is burning, so make sure you have a safe exit as visibility will decrease drastically, especially in smaller rooms, it will also be more difficult to breath.
Of course, the faster you interact with the fire then less time and energy you need to put it out. I also have a 1 litre of water in a bottle beside the laser as well as a spray bottle of water to catch those little fires just starting, I also have the laser in an enclosure limiting smoke propagation. Turn off any air assist / fume extractors. These will allow me to put out any fire quickly, limiting the damage done (and saving my precious laser).
Always protect yourself first, you can always buy a new laser, eyes / lungs are more difficult to replace.
Try not to leave these machines running without supervision, if you must try use smoke / flame sensors. I use some connected up to an Arduino and I also have a webcam looking in on the engraving if I am not in the same room.
Most of all, be safe.

8
not at all related to the lasering stuff but I have been busy (hence me absence, sorry about that!), I just passed my level 1 volunteer fireman's exam today. Knackered but the next exam is Friday and the real fireman said I am a natural (pyromaniac) and will have no problems passing the next and final level. (they admitted they did not cut me any slack and pushed me harder than they would normally and I loved it). Off to get my proper fireproof uniform, helmet, boots and the breathing equipment tomorrow!!
Just a thought, seeing the glee the firemen have when they set fire to stuff, I am of the opinion that the ones I frequented are all pyromaniacs, and proud of it!! apologies if this comes out as an insult, it is not at all the desired effect, I have great respect for them all.
Off to get rid of the smell of petrol and burnt and have myself a nice Belgian beer!!
The missus cant wait to see me in my new uniform, but I suspect her idea of a 'hot fireman' is not what she will see when I show her my get up!
=)

9
General Discussion / 2,500W laser and jeans...
« on: October 04, 2017, 10:48:34 AM »
now I have seen it all..
https://boingboing.net/2017/10/04/baudrillard-selvedge.html
The old fogie in me saw a 2.5W laser and thought woot, I can do that now!!!
then sense kicked in and the eyesight rectified .. 2,500W is NOT 2.5w!!
shame
=)

10
General Discussion / cohesion3D on a k40 with T2Laser..
« on: September 25, 2017, 08:44:01 AM »
Hi,
I have the cohesion3D board and will install it, looks like a straight swap.
I would like to use T2Laser with this board, is there anything I should change like a config file before launching the T2Laser software?
I presume I need to redefine the work area and so on, any pointers are welcome
=)

11
General Discussion / [Opinion] replacement Co2 lens and mirrors?
« on: September 19, 2017, 02:10:33 AM »
Hi,
I am looking into replacing the stock lens and mirrors. Anyone have any experiences with the different kinds? I know there are several types, gold plated and others and was wondering which I should be looking at as well as the different sizes (bit here I suppose I could just measure the ones I have...!). Any info on the lens is also welcome.
I know LightObjects have these available;
20mm Gold Plated Reflection Mirror
Improved 18mm ZnSe Focus lens
Is this what I should be looking at?
thanks
=)

12
General Discussion / 'free' replacement mirrors.... from HDD platters
« on: September 15, 2017, 06:07:25 AM »
I saw someone mention this and decided I needed more info. I found this;
http://diylaser.blogspot.be/2012/01/get-your-co2-laser-mirrors-for-free.html
how to use HDD platters as a source for replacement mirrors!!
Makes sense that you could use any reflective material but I wonder how efficient they are and how hot they might get.
I might give it a go if I am feeling like taking my aligned mirrors apart!
=)

13
General Discussion / silly Q? K40 'PWM'?
« on: September 12, 2017, 03:13:49 AM »
Hi,
I am looking all over the place but cant find a simple yes / no answer... well it might be a 'yes but' type answer...!
I also suspect that the reason there is no yes / no answer is because of the various different K40 types out there.
So, I have what I can only describe as an 'analogue' K40 (with the rotary variable resistor for power control) and was wondering
if I can have some semblance of PWM control over the laser power like I do with my 2.5W banggood elekslaser?
I have ordered the cohesion mini laser and this seems to be able for PWM but as my power control is on the variable resistor I think I might have to change the power supply to make it PWM compatible if it is possible at all!?
=)

14
General Discussion / different power / speeds over several passes?
« on: September 12, 2017, 01:03:19 AM »
Hi,
I am not sure where to post this so it goes in the general thread!
I was watching this video
https://www.youtube.com/watch?v=gXc0jnqZYuA
from some commercial Canadian laser company (they seem to have some nice videos..)
and the chap said something about doing 4 passes, the first 2 high power and slow speed then 2 low power / slow speed to clean out the first 2 passes....
anyone trued this? Is this a popular way of working? I would be interested in this if it did indeed clean-up the deeper engravings.
I ask as this seems like a great idea if it works and I have not heard of this being done...
=)

15
General Discussion / 16Bit or more replacement controller?
« on: September 07, 2017, 06:59:55 AM »
Hi,
I have the nano M2 and whilst it works I do not like the included software one bit.
In looking for a replacement board I see some are 8bit (older arduino and ramps), others 16bit and
others 32bit...
Anyone know what would be needed to get these K40 lasers running to the fullest of their capability?
Would choosing a lower bit rate controller reduce the speed at which you can run the laser? Is 32bit overkill
for these machines?
thanks,
Ki
=)

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