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Messages - oscyp

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1
Inspiration / Re: First real test
« on: March 25, 2018, 07:45:31 AM »
Yes I notice something like this on some engravings.
Unfortunately I have to focus the laser beam manually all the time. (I mean when changing the material).

What does it mean?

I'll do some tests later on today to show you.

2
Inspiration / Re: First real test
« on: March 24, 2018, 10:17:23 AM »
yes 100/15 means speed 100 and 15 passes.
Laser Power is 2500mW
Distance from lens ca. 11cm

3
Inspiration / Re: First real test
« on: March 24, 2018, 05:35:39 AM »

Ok I did a test with a paper tape.


This is the result before taking the tape off:



And after taking the tape off:



The last square just felt off. The rest - did not.
After using some force - the middle 2 squares also came out.
The very first one did not - even with quite a force...


So the tape is helping a little :)


PS this time the air assist was my hair-dryer :D

4
Inspiration / Re: First real test
« on: March 24, 2018, 03:40:35 AM »
Hello guys,

@ianchia I'll try the trick with a painter tape today, I think I had one that is 5cm wide - it will be enough for testing.

@nottingham82 I have self-made honeycomb bed out of 9x19mm shells :D - works very well. Anyway I need to work on air assist. Unfortunately, I have no 3d printer to make some useful parts for it...

5
Inspiration / Re: First real test
« on: March 23, 2018, 04:50:43 PM »
Won't it burn itself? :D

6
Inspiration / Re: First real test
« on: March 23, 2018, 04:44:47 PM »
it looks like a usual paper tape (like for wall painting or so)

7
Inspiration / Re: First real test
« on: March 23, 2018, 03:51:46 PM »
Ok, I was so curious that I found a can of compressed air and was blowing it constantly while cutting.
Here is the comparison:


So air assist is indeed helping with burnt edges but it does not affect the cutting abilities at all.... same number of passes - same results but less burnt.

8
Inspiration / Re: First real test
« on: March 23, 2018, 02:04:46 PM »
Yeah, dry plywood with urea-formaldehyde glue is so called "plywood for laser cutting".

Regarding the focus - it is really hard to do it manually with a knob. I tried to get the best focus I could. Anyway, it is still only a visual check afterwards. I am considering to add a Z-axis, but this would lead to changing the controller board as well...

9
Inspiration / Re: First real test
« on: March 23, 2018, 10:15:40 AM »
Ok, I have just made some tests with another type of 3mm plywood and it is far better. Here are the results.


Front side:



Back side (image flipped horizontally):



Front side again, after taking the squares out.



Square cut with a speed / no. of passes:
300/40, 100/20 - felt off very easily, almost spontaneously
300/35, 200/25 - felt off quite easy, a very little force was needed to push them out though
200/20 - felt off not so easy, some force was needed to push it out, but it could be done without any damage
300/30, 200/15, 100/15 - felt off very hard, quite much foce was needed to push them out, they were also torn while extracting


Conclusions:
- type of plywood makes significant difference
- dry plywood made of urea-formaldehyde glue can be cut 4.5 times faster (using speed 300: 180 vs. 40 passes to the same result) than a waterproof plywood made of epoxy glue
- speed 100 is still way too much over burning for me
- surprisingly speed 200 is not so bad this time


I hope that some people find this post useful.


I wonder how air assist would affect these tests...

10
Inspiration / Re: First real test
« on: March 22, 2018, 09:30:13 AM »

Oh thanks for the explanation! I think that your words are perfectly describing this picture:





Anyway both linked offers doesn't say anything about the type of those lens. So how should I know?
However, I am not sure why high-power lens are making poor depth cuts...

11
Inspiration / Re: First real test
« on: March 22, 2018, 05:02:37 AM »
hmm the dimensions of these parts are the same, so I don't know

so is it possible to use the original knob to focus the new lens? Or with the new lens a screwdriver is needed?


Do you have any focused-dot comparison? Is it really worth replacing?

12
Inspiration / Re: First real test
« on: March 22, 2018, 04:31:53 AM »

I have just realized that the plywood I was cutting was actually a waterproof plywood with some hard epoxy glue in it... that would explain the difficulties.
I will try to cut the other dry plywood with urea-formaldehyde glue soon to confirm it was the issue.


As for the lens: I searched for similar parts and here is what I have found - https://www.banggood.com/Triple-Glazing-Focusing-Lens-Collimating-Coated-Glass-Lens-Blue-Laser-Diode-405nm-p-1035471.html?rmmds=search&cur_warehouse=CN


Seems to be even cheaper and a little bit better (half thread vs. full thread).


I am only concerned about the mounting - does it fit inside the focusing barrel or is it replacing it? (some pictures of how it looks like on your machine would be great!)

13
Inspiration / Re: First real test
« on: March 21, 2018, 05:14:23 AM »

I'll test some other woods. Since yesterday I started considering if the glue could be a problem, so you're probably right.


And regarding the air assist - do you think it is good? https://www.thingiverse.com/thing:1688209
Unfortunately it does not suit the new laser holder of EleksMaker well - needs some adjustment.
Maybe you know better solutions?
But I like the idea - looks very nice.


---edit---
oh, I found something that should suit: https://www.thingiverse.com/thing:2626593 :)


Btw. pls point me what lens are you talking about? I didn't find anything for EleksMaker...

14
Inspiration / Re: First real test
« on: March 20, 2018, 03:13:08 PM »
it's just a common 3mm ply wood from a building store - I have no idea what wood it is made from

15
Inspiration / Re: First real test
« on: March 20, 2018, 11:12:20 AM »
Honeycomb - yes
Air assis - no, would it make so much difference to drop the number of passes from 200 to 8 like the other people are saying about successful cutting through?
Or maybe I have very strong plywood......

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