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Messages - chgames

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1
T2 Engraving / Re: Laser engraving into acrylic
« on: August 17, 2017, 01:37:03 PM »
We have done some stuff...

http://benboxlaser.us/index.php/topic,2142.0.html

Intensity 255, speed 20, 3000mw laser.

Edge lighting by LED works better if you etch it on the back.

We use 1/4" acrylic that comes with brown paper backing.  I'm pretty sure that the paper vaporizing is how the heat starts on the acrylic.  Then once the heat starts the acrylic, a slow speed allows the bubbling to extend deeper and deeper into the surface.

When we were using lexan it came with plastic protective backing instead of paper.  The clear lexan with no paper would barely etch at all.  We use transfer tape because we also do vinyl for signs.  Transfer tape is like masking tape but not very sticky and it comes in 12" tall rolls.   The plain transfer tape would work, but it worked better when we spray painted it black.

Lexan BURNS.  Acrylic bubbles but doesn't discolor like lexan.  So when it is edge lit, both look good.  When the lights are off, you can see the burning of the lexan and it isn't as attractive.

Below are three pictures, one is the NASCAR logo engraved into 1/4 lexan before we peel off the backing paper.

The next is a blurry and out of focus picture of some edge molding we use.  The led strip is mashed into the bottom of the edge molding and the engraved acrylic piece is fitted into the slot on top of it.  The screw holes allow it to be bolted down to make it secure.

Finally I thought I'd take a picture of one of our display boxes with the Harley Davidson Logo in it.  The funny white thing on the side is the sensor for changing the color of the LED lights.


2
T2 Engraving / Re: A few pictures of acrylic engraving
« on: May 25, 2017, 12:42:27 PM »
As far as colors... bright colors are... brighter.

Due to the way the human eye perceives color, green is very nice.  Blue is good also.

We buy the RGB led strips with a controller that allows all colors, mostly we have these on display flashing various colors in sequence.

You get best results when you burn the back side of the acrylic.  This means that the design is reversed during the burning process so that it looks good from the front.

The transfer tape that we paint black (It's basically masking tape that is twelve inches wide...) is placed on the acrylic, we burn the design backwards, then the transfer tape is removed.  The brown paper that is used as a protective film works better than transfer tape.

(Bonus Galaga pictures)

3
T2 Engraving / Re: A few pictures of acrylic engraving
« on: May 23, 2017, 11:19:02 AM »
We are using the 3000mw kit we bought off eBay.

Power 255, speed 30.

4
T2 Engraving / A few pictures of acrylic engraving
« on: May 23, 2017, 09:58:59 AM »
The photography is terrible, but here are a few things we've been doing with T2 Laser.

We engrave on acrylic.  Then we put LED lights to edge light.  These are early examples.  The 'Classic Home Gamerooms' photo in particular shows how badly fingerprints show.

The acrylic sheets we buy have brown paper.  The laser burns the paper.  We have used transfer tape (used by vinyl graphics people), and spray painted the tape black.  This gives good results, but if there is a small air bubble it will leave a gap in the  completed image.

T2 Laser has been working great for us!



5
D'oh!

Ok, it was totally my fault.

In T2 Laser when I opened the 'output size', the number of mm was larger than the size of the plot.

So I 'fixed' it. and caused my problem.

When I reduced the T2  output size to make it the number of mm that I expected the plot to be, it shrunk the output.

When I leave T2 alone it produced the correct sized plot.  I just need to ignore the 'output size'.

Feel free to delete this thread.



6
T2 Engraving / HPGL size is slightly too small - any suggestions?
« on: May 04, 2017, 12:54:56 PM »
When we do an engraving that is 18 inches wide, it comes out 16 5/8 inches wide.

This is a .plt file.

Any suggestions?  The guide says leave the plotter units at 1016 steps/inch... but it looks as though I might want to change that setting.




7
T2 Engraving / Re: Hatching - how do you guys do this?
« on: April 28, 2017, 02:18:54 PM »
Thanks for replying nottingham82!

I've gotten a lot out of your videos.  Keep them coming!

You started with an image file, and converted all the pixels that were filled in to a hatch.

I'm hoping to start with a vector file, and be able to fill certain things and leave other things wireframe outline.

I suppose I could convert it to a bitmap image file, but I'm wondering if someone has a better way... preferably with the ability to have different hatches for different shadings in the laser engraving.

Again, thanks for your videos!

8
T2 Engraving / Hatching - how do you guys do this?
« on: April 28, 2017, 01:35:36 PM »
It's a simple thing that has got me stumped.

I've got a vector drawing, I want the laser to engrave hatching lines that fill an object.

(See the example picture)

I'd like to set the lines to be (as in the picture) horizontal, but I might want to set the pitch of the hatch lines very fine to fill an area, or I might want them wider spaced.

It would be cool to be able to set them at 45 degrees.

I have access to corel designer and corel draw.  The vector drawings I use are actually created in an old version of a Neon creation program, but it exports .plt files that look great in T2 Laser.

How the heck do you guys fill an area if you don't hatch fill?




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