Author Topic: First real test  (Read 4229 times)

ggallant571

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Re: First real test
« Reply #15 on: March 08, 2018, 09:47:53 AM »
Nice to see you making forward progress.

Some observations:
  1. I have found by experimenting that I get better results by applying a sealer/stain to the wood prior to etching.
  2. Get a  small air compressor to blow away the soot.
  3. The vertical edges do not look as sharp as I would expect.
  4. You may benefit by touching up the original. Nottingham82 has posted instructions.
SARCASM - Just one more service we offer here.

oscyp

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Re: First real test
« Reply #16 on: March 19, 2018, 04:45:29 PM »
Wow... how you guys get such results in cutting?
I have EleksMaker 2500mW from Banggood but cutting the plywood is horrible....
I have a home made honeycomb bed ( used a lot of 9x19mm brass :D).
Also focused the beam the best I could.
But cutting 3mm plywood takes over 50 passes... no kidding 50!
Power is: 255, Speed: 200
The newest grbl 1.1e used with full T2Laser Software

what am I missing...?
« Last Edit: March 19, 2018, 04:51:11 PM by oscyp »

pbucc

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Re: First real test
« Reply #17 on: March 19, 2018, 04:57:16 PM »
Wow... how you guys get such results in cutting?
I have EleksMaker 2500mW from Banggood but cutting the plywood is horrible....
I have a home made honeycomb bed ( used a lot of 9x19mm brass :D).
Also focused the beam the best I could.
But cutting 3mm plywood takes over 50 passes... no kidding 50!
Power is: 255, Speed: 200
The newest grbl 1.1e used with full T2Laser Software

what am I missing...?
Air blower. Keeps the char build up down.

Sent from my LG-H873 using Tapatalk

2500mw A3 eleks maker.
Windows 10.
T2 Laser.
"I'm new to this. Please be gentle"

oscyp

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Re: First real test
« Reply #18 on: March 19, 2018, 05:01:19 PM »
Yeah I was thinking about that, however it is hard to achieve a strong narrow stream... don't have any good idea so far...
But I thought not having fan will make difference of 3-5 passes... not 40.... :/

btw, how to check if my 2500mW laser is really 2500mW? any test I could do?
« Last Edit: March 19, 2018, 05:02:57 PM by oscyp »

pbucc

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Re: First real test
« Reply #19 on: March 19, 2018, 05:06:00 PM »
Yeah I was thinking about that, however it is hard to achieve a strong narrow stream... don't have any good idea so far...
But I thought not having fan will make difference of 3-5 passes... not 40.... :/
The paper took me 25 min.  Wood will take longer. There are a lot of posts on how to make one. I just ordered a fish tank air pump. I haven't put all together yet.

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2500mw A3 eleks maker.
Windows 10.
T2 Laser.
"I'm new to this. Please be gentle"


oscyp

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Re: First real test
« Reply #21 on: March 20, 2018, 08:27:26 AM »
Here are some fresh tests from me, 3mm plywood, square 10x10 [mm]

Left column: speed 200, middle column: speed 100, right column: speed 300
Inside the square there are number of passes.
Only on speed 300 and >150 passes I could go through and the square is not over burnt.
The white color is the very intense light of a flashlight on the other side while scanning the results.

Front side:


Back side:


To be honest.... I'm not so happy... :/


---edit---


I did another run with 220 passes - then the square just fell off when I took the plywood. 220..... Took 30min to cut 1cm square.... :/
« Last Edit: March 20, 2018, 09:54:45 AM by oscyp »

Zax

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Re: First real test
« Reply #22 on: March 20, 2018, 11:05:49 AM »
Are you using air assist and a raised honeycomb or grid base?

They make a huge difference to cutting.

oscyp

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Re: First real test
« Reply #23 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......

Alan

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Re: First real test
« Reply #24 on: March 20, 2018, 02:25:52 PM »
You using common garden variety 3ply or Laser Ply?

Note: I use the common 3ply under my cutting grid to block my 10W laser.

oscyp

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Re: First real test
« Reply #25 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

Alan

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Re: First real test
« Reply #26 on: March 20, 2018, 03:28:26 PM »
The type of wood is not the problem.

From reading posts on here and other research I have done on the net, it would seam that the glues and possible air gapes in the mid layers that are the killers to laser cutting.

After trying this myself on 3mm ply from the hardware I could not get past the first layer of timber with 20 passes. Then finding that it only takes 4 passes at 200 to cleanly cut 3mm MDF, I kinda figure their right.



I'm still fairly new to this myself so can someone else confirm this please.

pedwards2932

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Re: First real test
« Reply #27 on: March 21, 2018, 04:46:01 AM »
You definitely need to use plywood designed for laser......the glue causes problems.  I would also look into getting one of the glass lens instead of the one that came with the machine that seemed to help with mine.  Finally getting the focus precise is very important, you have to take the time to make sure you have the thinnest cut line possible.  I was able to cut in 4 to 5 passes at 100 mm/min with a small kerf.  The air assist has to be working properly to clear the cut for each pass.

oscyp

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Re: First real test
« Reply #28 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...
« Last Edit: March 21, 2018, 05:24:56 AM by oscyp »

pedwards2932

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Re: First real test
« Reply #29 on: March 22, 2018, 04:19:49 AM »
Here is one similar to the one I got:  https://www.ebay.com/itm/1pcs-Collimating-Half-thread-Coated-Glass-Lens-for-405nm-Violet-Blue-Laser-Diode-/151895001627?hash=item235da5ca1b

I just cut some 1/16 balsa the other night and I spent extra time getting it to focus and was able to cut at 360mm/min with as fine a kerf as I have ever gotten so it truly makes a big difference getting the focus correct.  I think any of the air assists will make a difference especially on plywood.  I use an aquarium pump and some 1/8" aluminum tubing.  I have a small airbrush pump that I want to try but just haven't gotten around to it.