Wednesday, November 30, 2016

Laser Photo Engraving


Selection of Images & Laser Parameters



 The Photo


Before the laser comes into play, selecting the right photo is the first hurdle to overcome when photo engraving. It is critical to choose a photo with good resolution and high contrast.

The Laser


Optimal results are achieved by dialing in the appropriate material parameters on your laser system. Be sure to select the correct speed, power settings, and focal length for the material you are engraving on.

If you can master both of these steps you'll create perfectly engraved photos every time.


Raster Algorithms


Depending on the image you would like to engrave and the material you intend to use, your project may need to use different raster algorithms.

Trotec has taken the guess work out of this process. For your convenience, you can find all of the raster algorithms built into Trotec's JobControl X software.


Tools for Image Processing


Since the resolution and contrast of your image is critical, it is sometimes necessary to adjust the image to make it  more suitable for laser engraving.

To improve the contrast and/or make the image clearer, utilize the editing tools in your preferred graphic software package.


Lean More about Engraving Photos


Trotec's application department has developed a comprehensive how to guide for photo engraving.

Download your How to Photo Engraving Guide from troteclaser.com

Wednesday, November 16, 2016

The Correct Lens for Perfect Results


Choosing the Right Lens

The parameters are fine and the focus is set correctly, but somehow the engraving is still not correct. Has this ever happened to you?  You're most likely experiencing a lens issue. The correct lens is just as important as the right parameters and optimal focus adjustment.

To select the correct lens, you must consider the following factors:
  • Output of your laser device
  • Material
  • Detail level of the graphics
  • Resolution (dpi)
  • Thickness of the material

The Rule of Thumb:

The more delicate and detailed the graphics are, the smaller the lens should be. For cutting thick materials,  larger lenses are recommended. 

Technical features in plain terms:

The following is a glossary of the terms used to discuss lenses.

Graphic explains focal length, focus and beam diameter+


Focal length


Distance between the lens and the point of the smallest beam diameter (= focus).


Focus


The area where the laser beam is optimally focused and converges to the smallest possible beam diameter.


Beam diameter


The diameter of the laser beam which becomes wider before and after the area of focus. The longer the focal distance of the lens, the greater the beam diameter. The energy of the laser is focused by the lens onto a defined focal point. The greater the focal distance of the lens, the greater  the surface onto which the energy of the laser is applied. This may mean that if you use a large lens, the material is heated rather than cut.


Focus tolerance (depth of focus)


The area in which the beam has the smallest diameter.The larger the lens (= the larger the focal length of the lens), the longer the focal tolerance. This means that the focus tolerance of a 5” lens will be twice that of a 2.5” lens. This is especially important if you want to cut through thick materials.

Check out this chart on troteclaser.com to see our Speedy and SP series lens portfolio.