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Messages - pedwards2932

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1
General Discussion / Re: Lens Test
« on: August 25, 2020, 07:02:39 PM »
Now that makes sense.....G2 won't cut as deep.  So far the 3 element has been the best.  I will make a comparison with the G8.

2
General Discussion / Re: Lens Test
« on: August 25, 2020, 02:47:15 PM »
Got the G8 lens but haven't had time to test yet.  I got to thinking about the G2 and did some research.  The distance from lens to work should be between 5 and 30mm.  I was using 32mm because the Endurance site chart that gave the most info indicated 32 mm was best. In my research I found this page https://endurancelasers.com/laser-beam-focusing/#:~:text=For%20a%203%20element%20lens%2C%20the%20best%20focal,lens%2C%20the%20best%20focal%20range%20is%206.8%20mm.
This indicates closer to the work is better like 6.8 mm!  There is a lot of information on focus on that link.  I have already really improved the cutting by adding the z axis adjustment and getting the optimal distance from the work with the 3 element.  From what I have read the G2 should be able to get even a finer line and 95% of full power where the 3 element is only 70% of full power. 

3
General Discussion / Re: Lens Test
« on: August 22, 2020, 04:05:42 AM »
I think I will get a G8 as well just to make comparison.  I was really surprised at how night and day the difference between the two I tested.  Since I mainly use it to cut the 3 element is working really well.

4
General Discussion / Re: Lens Test
« on: August 21, 2020, 11:14:06 AM »
2.5 watt at full power using the air assist that I printed http://benboxlaser.us/index.php/topic,3906.msg42230.html#msg42230
with a Harbor freight airbrush compressor.  The big difference is after printing an adjustable z axis and using the 3" focal distance it seems the cutting is much more efficient.  Also the 3 element lens was much better than the G2 at 32mm focal distance.  I just wasn't able to get the G2 to work very well.  The first pictures where you see the focal lines from the G2 and then a single pass with the 3 element is pretty remarkable difference.

5
General Discussion / Re: Lens Test
« on: August 20, 2020, 04:21:41 PM »
Not sure if there is interest in this but it seems that the focal distance adjustment has allowed me to get the thinnest kerf I have ever done.  The pic shows some ribs I cut out.  It is softer 1/16 balsa.  I was able to cut completely thru at 550 mm/min at focal distance of 3 inches and there is very little charring as you can see from the second pic which shows the edge of the rib.

6
T2 Engraving / Re: DXF files shows in blue
« on: August 19, 2020, 05:59:35 AM »
I'd like the color palette....where can I get it?  I am thinking with some of these larger plans I am building it would be helpful to put in part numbers that I could burn faster so it doesn't burn thru.  Thanks.

7
T2 Engraving / Re: DXF files shows in blue
« on: August 18, 2020, 05:41:49 PM »
I figured it out.....seems my lines had a bit of blue in the Inkscape file....looked black but T2 picked it up as blue and I assume it was running at 40% power.  Once I got it to black all worked fine.

8
T2 Engraving / DXF files shows in blue
« on: August 18, 2020, 04:25:26 PM »
Not sure how this happened.  I converted my Inkscape SVG to a DXF and for some reason it shows up in T2 in blue.  It wouldn't bother me but it is somehow screwing with the power output.  I ran some test focus lines and it worked perfectly but the focus line shows in black.  When I ran the file I wanted to cut it ran thru the whole cut file and didn't burn anything just a few dots.  I don't know how to make the DXF lines in black as they are black in Inkscape.

9
General Discussion / Lens Test
« on: August 18, 2020, 02:30:25 PM »
I tried a cut last night on balsa and it did not go well.  I was using my G2 lens and it wasn't going thru at all.  I decided to test the 2 lens I have to see what is going on.  I did several focus runs with the G2 and was only able to burn thru decently at 450mm/min 2 passes distance from balsa about 30mm. I then used my 3 element colloidal lens at 450mm/min 1 pass 3inches from balsa and the line was much thinner and went completely thru.  On the picture the one with several lines is the G2 and the one with the single line is the 3 element.  The other pic is the back side showing the burn went thru.

10
General Discussion / Re: New wheels
« on: June 19, 2020, 06:18:09 PM »
21.779 mm  96 dpi

11
General Discussion / Re: New wheels
« on: June 19, 2020, 05:46:42 AM »
Here is the png of the Spitfire nose section

12
General Discussion / Re: New wheels
« on: June 18, 2020, 07:50:11 AM »
Do you need it as a SVG or PNG?  I work with Inkscape so my files are usually SVG or DXF.

13
General Discussion / Re: New wheels
« on: June 18, 2020, 03:55:12 AM »
Been cutting with the G2 lens for several jobs now.  I was able to cut cherry veneer in 2 passes at 700 mm/sec.  I was able to cut thru 1/16 balsa at 800 mm/sec single pass. This is  the fastest I have ever been able to cut.  I need to figure out how to sequence the cuts in T2 as I had some parts that have internal cuts and the parts fell thru then tried to make the internal cuts.  I guess I could make some small bridges to hold the parts that you have to cut thru to release.....not positive how to do that in Inkscape.

14
T2 Engraving / Re: Selective cutting
« on: June 09, 2020, 04:29:41 PM »
I made a burn board that has a .020 metal glued to a mdf board.  I printed up some holding devices that uses magnets and the balsa has about 5mm of air between it and the metal

15
T2 Engraving / Re: Selective cutting
« on: June 09, 2020, 03:39:02 PM »
I am still working with the air assist but I am using a airbrush compressor so I am getting a fair amount of air.  If I cut at 800 mm/min there is almost no charring and it goes thru in a lot of places.  I had to turn down to 575 mm/min and it cut thru almost all but there was a small amount of charring. I still had to take out an exacto and cut thru a couple of places.  I think the density in balsa is not consistent and cross grain can be an issue.  I didn't notice it except in the harder sections of the wood.  Next time I will try 800 and push out the pieces that are free so they don't get the second pass. Since it doesn't just happen on cross grain but in different sections of the wood I don't think vector adjustment would help.

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