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Author Topic: The Laser Project.  (Read 855141 times)

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Re: The Laser Project.
« Reply #1040 on: February 19, 2018, 04:17:21 AM »
Judging by the photos that you posted, you never did quite get to the same level of fine detail in terms of cutting out the bicycle as the pros? How fine can your setup get do you think?

Offline Tweakie.CNC

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Re: The Laser Project.
« Reply #1041 on: February 19, 2018, 04:55:23 AM »
Judging by the photos that you posted, you never did quite get to the same level of fine detail in terms of cutting out the bicycle as the pros? How fine can your setup get do you think?

Strange comment to make. Perhaps you need to read a few more of the posts.  ;)  http://www.machsupport.com/forum/index.php/topic,12444.msg102590.html#msg102590

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: The Laser Project.
« Reply #1042 on: February 19, 2018, 05:04:48 AM »
Ah I think I missed the size of those bikes when I saw the pic.

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Re: The Laser Project.
« Reply #1043 on: March 06, 2018, 06:35:06 AM »
A couple of laser produced images from the same .jpg - there must be an infinite number of variations possible by using different techniques / settings, the problem is deciding which one I like the best.  ;D

Tweakie.


Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline Dan13

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Re: The Laser Project.
« Reply #1044 on: March 06, 2018, 07:26:08 AM »
Nice. The first one must be a dithered image used with DotG or the like. The second one a very nice grayscale and the third seems like a poor attempt at grayscale  ;D

Dan

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Re: The Laser Project.
« Reply #1045 on: March 07, 2018, 04:00:06 AM »
 :)

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: The Laser Project.
« Reply #1046 on: March 11, 2018, 10:13:24 PM »
1st one is the best.

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Re: The Laser Project.
« Reply #1047 on: March 13, 2018, 05:28:55 AM »
Hi Spandex,

I think Dan13 has summed it up well.

The first one was created from a ‘dithered’ image (which creates the illusion of shade by varying the density of individual dots) and this is the most common form of laser image reproduction. It is easy to do and it is quick.
Generally a specialist software (such as PhotoGrav) is used to create the 1 bit  ‘dithered’ image which is then sized and adjusted to match the d.p.i resolution of the particular laser being used. I used 200 d.p.i. here as it is usual to limit the image resolution to 200 or 300 d.p.i  (there is little point in specifying a smaller pixel size than the laser is actually capable of reproducing).

There are a few of us who are interested in producing true 8 bit gray-scale images (as the second picture) but it is not so easy to do as different materials react to the laser in different ways and the production time is much longer.

As he previously mentioned, Art is currently building a galvo scanning system which can work at much higher axis feed-rates than standard linear systems such as mine and I am eagerly awaiting the results of his initial tests before I start on building something similar.

The third image is very much ‘work in progress’ as it is probably the best of the three but it needs far more contrast - who knows, perhaps one day I will succeed.

Tweakie.
« Last Edit: March 13, 2018, 06:14:50 AM by Tweakie.CNC »
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline ART

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Re: The Laser Project.
« Reply #1048 on: March 14, 2018, 03:03:35 PM »
Tweakie:

    Just starting to test..

https://www.youtube.com/watch?v=5bOzb-32pa8

  Im impressed so far, but you know I see nwo speed wont help in photos at all.
The Laser is controlled in 1ms packets, so if you raster a photo at 1 second across,
it will have a resolutoin of 1000 pixels. At .5 seconds, only 500. Faster you go the
less res you have. In theory a 4k image at 4 seconds per raster sweep is the highest res.
one can get ..

  I'm finding galvos are great at vector works, infinite acceleration helps.. but for photos
I think speed is my enemy..

Art



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Re: The Laser Project.
« Reply #1049 on: March 15, 2018, 02:51:32 AM »
Wow that is quick.

Nice work Art  (I notice that the beam is not turning off during the rapids  :D).

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.