How to Improve your Area Engraving results

A guide by Dan Emery - originally posted to the Ponoko Blog.

This test shows how the laser cutter handles area engraving of different font sizes and how you can improve the quality of your engraving.

Our current set up uses 3 colors for 3 different intensities of area engraving:

  • light gray for light area engraving
  • medium gray for medium area engraving
  • black for heavy area engraving

The way the laser cutter works is like an old dot matrix printer except instead of dots of ink it uses pulses of the laser beam. For the black, the density of the pulses is the highest and you get good resolution. For the lighter engraving, there is less density of pulses and this produces a lower resolution especially if the text or shape being engraved is small. This is most noticeable around the edges of the shapes and on curves or diagonal lines.



You can see what I am talking about below. With the smallest text pieces the resolution isn't so great and some of the text is even missing whereas the heavy area engraving has smooth lines and looks crisp.





One thing you can do to improve the quality of the engraving is put a vector engraving line around your text or shapes to make the edges more crisp. There are pros and cons for using this technique and it largely depends on which material you are using. Personally, I like a heavy area engraving on any of the plastics but a medium area engraving with a medium vector outline on the timbers.

See below for more some detail shots of the different variations and make up your own mind from there.

In black acrylic -

black-raster-only.jpg black-with-light-vector.jpg black-with-medium-vector.jpg



In the technoply beech -

beech-raster-only.jpg beech-with-light-vector.jpg beech-with-medium-vector.jpg



In eurolite poplar -

poplar-raster-only.jpg poplar-with-light-vector.jpg poplar-with-medium-vector.jpg



So this is a small selection of the materials but should give a fair indication of what to expect when area engraving. Engraving on the timbers will produce a fairly similar result as the 2 shown and engraving on the other acrylic colors will have the same affect as on the black.

PETG or styrene are nearly impossible to photograph to show the differences in the engraving details and deserve a more specific post in the future.

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  • 0
    Bob Kruijer

    Hi there,

    I've gotten some things lasercut previsouly, and engraved as well. They used heavy raster engraving on casted acrylic and it looked great. Now I have tried it myself with a  40w laser but I cannot get the frosted results, it will engrave deep, but it still appears pretty dark. See this picture as comparison:!AruLeHDN8jqRlnCjgXGwgYtvgcUZ

    The top one has a big text that was done previously, looks good, and the bottom one I tried myself. I played around with ppi settings and used different speed and power to no avail. The material I use should be the exact same, I even tried 2 small rectangles below the original large rectangle hole, you can barely see them because they did not turn out frosted either.

    Any tips I can use or is my laser just not capable of doing this?

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