I'm getting ready to try doing some laser cutting with my 5.5W laser that's described in this post: Trying out my laser .
I needed a simple way to get the laser focused on the material I'm cutting and I've found that focusing it visually can be time consuming and also problematic with reflective material. I decided to use the technique that they used with the Community College C02 lasers which is a mechanical calibration block. I think this is what most people do.
I first got the laser focused visually as best that I could (minimizing the dot size) and then I engraved lines at varying Z settings and then determined which Z setting gave me the narrowest line. At that setting I measured the distance from the front of the lens housing to the material. Then I designed and printed a calibration block that would allow me to set that distance easily.
Here is the design in Openscad:
And the printed block:
And example of it in use:
The next step is to determine how much focal depth I have. I saw an interesting video on YouTube that describes how longer focal length lenses tend to give a larger spot but also a larger depth of focus: Laser Cutter Focus - Measuring Focal Point and Depth of Cut.
Here is a diagram from the video that illustrates the concept:
The focal point that I measured is about 39mm from the front of the lens mount so I expected a rather short focal range (what the diagram refers to as cutting length).
I created a short GCode program so that I could measure the range:
G0 X0 Y0 M3 S0 F120 G0 X43.7 Y5.7 Z-10 S0 G1 X43.3 S128 G0 X42.4 Y5.7 S0 G1 X41.4 S128 G0 X41.3 Y5.8 S0 G1 X42.5 S128 G0 X43.2 Y5.8 S0 G1 X43.9 S128 G0 X44 Y5.9 S0 G1 X43.8 S128 G0 X43.3 Y5.9 S0 G1 X43.1 S128 G0 X42.1 Y5.9 S0 G1 X41.7 S128 G0 X41.8 Y6 S0 G1 X42 S128 G0 X43 Y6 S0 G1 X43.3 S128 G0 X43.8 Y6 S0 G1 X44.1 S128 G0 X44.2 Y6.1 S0 G1 X43.9 S128 G0 X43.2 Y6.1 S0 G1 X42.9 S128 G0 X42 Y6.1 S0 G1 X41.8 S128 G0 X6.5 Y6.2 S0 G1 X39.0 S255 G0 X38.7 Y6.2 S0 G1 X39.1 S128 G0 X41.8 Y6.2 S0 G1 X42 S128 G0 X42.9 Y6.2 S0 G1 X43.2 S128 G0 X43.9 Y6.2 S0 G1 X44.2 S128 G0 X44.3 Y6.3 S0 G1 X44 S128 G0 X43.1 Y6.3 S0 G1 X42.9 S128 G0 X42.1 Y6.3 S0 G1 X41.8 S128 G0 X40.1 Y6.4 S0 G1 X40.8 S128 G0 X41.8 Y6.4 S0 G1 X42.1 S128 G0 X42.8 Y6.4 S0 G1 X43.1 S128 G0 X44 Y6.4 S0 G1 X44.3 S128 G0 X44.3 Y6.5 S0 G1 X44 S128 G0 X43.1 Y6.5 S0 G1 X42.8 S128 G0 X42 Y6.5 S0 G1 X41.8 S128 G0 X40.8 Y6.5 S0 G1 X40.1 S128 G0 X41.8 Y6.6 S0 G1 X42 S128 G0 X42.8 Y6.6 S0 G1 X43.1 S128 G0 X44 Y6.6 S0 G1 X44.3 S128 G0 X44.3 Y6.7 S0 G1 X44 S128 G0 X43.1 Y6.7 S0 G1 X42.8 S128 G0 X42.1 Y6.7 S0 G1 X41.8 S128 G0 X41.8 Y6.8 S0 G1 X42.1 S128 G0 X42.8 Y6.8 S0 G1 X43.1 S128 G0 X44 Y6.8 S0 G1 X44.3 S128 G0 X44.3 Y6.9 S0 G1 X44 S128 G0 X43.1 Y6.9 S0 G1 X42.8 S128 G0 X42 Y6.9 S0 G1 X41.8 S128 G0 X41.8 Y7 S0 G1 X42 S128 G0 X42.9 Y7 S0 G1 X43.1 S128 G0 X44 Y7 S0 G1 X44.3 S128 G0 X44.3 Y7.1 S0 G1 X44 S128 G0 X43.1 Y7.1 S0 G1 X42.8 S128 G0 X42 Y7.1 S0 G1 X41.8 S128 G0 X41.8 Y7.2 S0 G1 X42 S128 G0 X42.9 Y7.2 S0 G1 X43.2 S128 G0 X43.9 Y7.2 S0 G1 X44.2 S128 G0 X44.2 Y7.3 S0 G1 X43.9 S128 G0 X43.2 Y7.3 S0 G1 X42.9 S128 G0 X42.1 Y7.3 S0 G1 X41.8 S128 G0 X41.6 Y7.3 S0 G1 X41.3 S128 G0 X41.4 Y7.4 S0 G1 X42 S128 G0 X43 Y7.4 S0 G1 X43.3 S128 G0 X43.9 Y7.4 S0 G1 X44.2 S128 G0 X44.1 Y7.5 S0 G1 X43.8 S128 G0 X43.3 Y7.5 S0 G1 X43 S128 G0 X42 Y7.5 S0 G1 X41.5 S128 G0 X41.6 Y7.6 S0 G1 X42 S128 G0 X43.2 Y7.6 S0 G1 X44 S128 G0 X43.9 Y7.7 S0 G1 X43.3 S128 G0 X42 Y7.7 S0 G1 X41.8 S128 G0 X43 Y8.4 Z-9 S0 G1 X43.5 S128 G0 X43.7 Y8.5 S0 G1 X42.9 S128 G0 X43.6 Y8.6 S0 G1 X43.9 S128 G0 X44 Y8.7 S0 G1 X43.7 S128 G0 X43.8 Y8.8 S0 G1 X44.1 S128 G0 X44.1 Y8.9 S0 G1 X43.9 S128 G0 X6.5 Y9 S0 G1 X39.0 S255 G0 X43.9 Y9 S0 G1 X44.2 S128 G0 X44.2 Y9.1 S0 G1 X43.9 S128 G0 X42.5 Y9.1 S0 G1 X41.9 S128 G0 X41.8 Y9.2 S0 G1 X42.5 S128 G0 X43.9 Y9.2 S0 G1 X44.2 S128 G0 X44.2 Y9.3 S0 G1 X43.1 S128 G0 X43 Y9.4 S0 G1 X44.2 S128 G0 X44.2 Y9.5 S0 G1 X43.9 S128 G0 X43.2 Y9.5 S0 G1 X42.9 S128 G0 X42.9 Y9.6 S0 G1 X43.2 S128 G0 X43.9 Y9.6 S0 G1 X44.2 S128 G0 X44.2 Y9.7 S0 G1 X43.9 S128 G0 X43.1 Y9.7 S0 G1 X42.8 S128 G0 X42.8 Y9.8 S0 G1 X43.1 S128 G0 X43.9 Y9.8 S0 G1 X44.2 S128 G0 X44.2 Y9.9 S0 G1 X43.9 S128 G0 X43.1 Y9.9 S0 G1 X42.8 S128 G0 X42.8 Y10 S0 G1 X43.2 S128 G0 X43.9 Y10 S0 G1 X44.2 S128 G0 X44.1 Y10.1 S0 G1 X43.8 S128 G0 X43.2 Y10.1 S0 G1 X42.9 S128 G0 X43 Y10.2 S0 G1 X43.3 S128 G0 X43.7 Y10.2 S0 G1 X44.1 S128 G0 X43.9 Y10.3 S0 G1 X43.1 S128 G0 X43.3 Y10.4 S0 G1 X43.8 S128 G0 X43.8 Y11.1 Z-8 S0 G1 X43.7 S128 G0 X43.6 Y11.1 S0 G1 X43.5 S128 G0 X43.1 Y11.2 S0 G1 X44 S128 G0 X44.1 Y11.3 S0 G1 X43.8 S128 G0 X43.3 Y11.3 S0 G1 X42.9 S128 G0 X42.9 Y11.4 S0 G1 X43.2 S128 G0 X43.9 Y11.4 S0 G1 X44.2 S128 G0 X44.2 Y11.5 S0 G1 X44 S128 G0 X43.1 Y11.5 S0 G1 X42.9 S128 G0 X42.8 Y11.6 S0 G1 X43.1 S128 G0 X44 Y11.6 S0 G1 X44.2 S128 G0 X44.2 Y11.7 S0 G1 X44 S128 G0 X43.1 Y11.7 S0 G1 X42.8 S128 G0 X6.5 Y11.7 S0 G1 X39.0 S255 G0 X41.9 Y11.8 S0 G1 X42.5 S128 G0 X42.9 Y11.8 S0 G1 X43.2 S128 G0 X43.9 Y11.8 S0 G1 X44.2 S128 G0 X44.2 Y11.9 S0 G1 X43.8 S128 G0 X43.2 Y11.9 S0 G1 X42.9 S128 G0 X42.5 Y11.9 S0 G1 X41.8 S128 G0 X43.1 Y12 S0 G1 X44.1 S128 G0 X44 Y12.1 S0 G1 X43.2 S128 G0 X43.2 Y12.2 S0 G1 X43.9 S128 G0 X44 Y12.3 S0 G1 X43.6 S128 G0 X43.5 Y12.3 S0 G1 X43.1 S128 G0 X43 Y12.4 S0 G1 X43.3 S128 G0 X43.8 Y12.4 S0 G1 X44.1 S128 G0 X44.2 Y12.5 S0 G1 X43.9 S128 G0 X43.2 Y12.5 S0 G1 X42.9 S128 G0 X42.9 Y12.6 S0 G1 X43.2 S128 G0 X43.9 Y12.6 S0 G1 X44.2 S128 G0 X44.2 Y12.7 S0 G1 X43.9 S128 G0 X43.2 Y12.7 S0 G1 X42.9 S128 G0 X42.9 Y12.8 S0 G1 X43.2 S128 G0 X43.9 Y12.8 S0 G1 X44.2 S128 G0 X44.1 Y12.9 S0 G1 X43.8 S128 G0 X43.3 Y12.9 S0 G1 X43 S128 G0 X43.1 Y13 S0 G1 X44 S128 G0 X43.9 Y13.1 S0 G1 X43.2 S128 G0 X43.4 Y13.9 Z-7 S0 G1 X43.1 S128 G0 X43.2 Y14 S0 G1 X43.5 S128 G0 X43.5 Y14.1 S0 G1 X43.2 S128 G0 X43.2 Y14.2 S0 G1 X43.5 S128 G0 X43.6 Y14.3 S0 G1 X43.3 S128 G0 X6.5 Y14.4 S0 G1 X39.0 S255 G0 X43.4 Y14.4 S0 G1 X43.6 S128 G0 X43.7 Y14.5 S0 G1 X43.4 S128 G0 X42.4 Y14.5 S0 G1 X41.9 S128 G0 X41.8 Y14.6 S0 G1 X42.5 S128 G0 X43.4 Y14.6 S0 G1 X43.7 S128 G0 X43.7 Y14.7 S0 G1 X43.5 S128 G0 X43.5 Y14.8 S0 G1 X43.8 S128 G0 X43.9 Y14.9 S0 G1 X43.6 S128 G0 X43.6 Y15 S0 G1 X43.9 S128 G0 X43.9 Y15.1 S0 G1 X43.7 S128 G0 X43.7 Y15.2 S0 G1 X44 S128 G0 X44 Y15.3 S0 G1 X43.7 S128 G0 X43.8 Y15.4 S0 G1 X44.1 S128 G0 X44.1 Y15.5 S0 G1 X43.8 S128 G0 X43.9 Y15.6 S0 G1 X44.2 S128 G0 X44.2 Y15.7 S0 G1 X42.9 S128 G0 X42.9 Y15.8 S0 G1 X44.1 S128 G0 X43.2 Y16.6 Z-6 S0 G1 X43.9 S128 G0 X44.1 Y16.7 S0 G1 X43.8 S128 G0 X43.5 Y16.7 S0 G1 X43.1 S128 G0 X43 Y16.8 S0 G1 X43.3 S128 G0 X43.9 Y16.8 S0 G1 X44.2 S128 G0 X44.2 Y16.9 S0 G1 X43.9 S128 G0 X43.2 Y16.9 S0 G1 X43 S128 G0 X42.9 Y17 S0 G1 X43.2 S128 G0 X44 Y17 S0 G1 X44.2 S128 G0 X44.2 Y17.1 S0 G1 X44 S128 G0 X43.2 Y17.1 S0 G1 X42.9 S128 G0 X6.5 Y17.1 S0 G1 X39.0 S255 G0 X41.9 Y17.2 S0 G1 X42.4 S128 G0 X42.9 Y17.2 S0 G1 X43.2 S128 G0 X44 Y17.2 S0 G1 X44.2 S128 G0 X44.2 Y17.3 S0 G1 X44 S128 G0 X43.2 Y17.3 S0 G1 X42.9 S128 G0 X42.5 Y17.3 S0 G1 X41.8 S128 G0 X42.9 Y17.4 S0 G1 X43.2 S128 G0 X43.9 Y17.4 S0 G1 X44.2 S128 G0 X44.2 Y17.5 S0 G1 X43.8 S128 G0 X43.3 Y17.5 S0 G1 X42.9 S128 G0 X42.9 Y17.6 S0 G1 X44.1 S128 G0 X43.3 Y17.7 S0 G1 X42.9 S128 G0 X42.9 Y17.8 S0 G1 X43.2 S128 G0 X43.2 Y17.9 S0 G1 X42.9 S128 G0 X43 Y18 S0 G1 X43.2 S128 G0 X43.3 Y18.1 S0 G1 X43 S128 G0 X43.1 Y18.2 S0 G1 X43.4 S128 G0 X43.4 Y18.3 S0 G1 X43.1 S128 G0 X43.3 Y18.4 S0 G1 X44.1 S128 G0 X44.1 Y18.5 S0 G1 X43.4 S128 G0 X43.7 Y19.3 Z-5 S0 G1 X42.8 S128 G0 X42.7 Y19.4 S0 G1 X43 S128 G0 X43.4 Y19.4 S0 G1 X43.8 S128 G0 X43.9 Y19.5 S0 G1 X43.6 S128 G0 X42.9 Y19.5 S0 G1 X42.7 S128 G0 X43.7 Y19.6 S0 G1 X44 S128 G0 X44 Y19.7 S0 G1 X43.7 S128 G0 X6.5 Y19.8 S0 G1 X39.0 S255 G0 X43.7 Y19.8 S0 G1 X44.1 S128 G0 X44 Y19.9 S0 G1 X43.7 S128 G0 X42.2 Y19.9 S0 G1 X41.7 S128 G0 X41.6 Y20 S0 G1 X42.3 S128 G0 X43.7 Y20 S0 G1 X44 S128 G0 X44 Y20.1 S0 G1 X43.6 S128 G0 X43.5 Y20.2 S0 G1 X43.9 S128 G0 X43.7 Y20.3 S0 G1 X42.9 S128 G0 X42.8 Y20.4 S0 G1 X43.5 S128 G0 X43 Y20.5 S0 G1 X42.8 S128 G0 X42.8 Y20.6 S0 G1 X43 S128 G0 X43 Y20.7 S0 G1 X42.8 S128 G0 X42.8 Y20.8 S0 G1 X43 S128 G0 X43 Y20.9 S0 G1 X42.8 S128 G0 X42.8 Y21 S0 G1 X43.1 S128 G0 X43.8 Y21.1 S0 G1 X42.8 S128 G0 X42.9 Y21.2 S0 G1 X43.9 S128 G0 X43.7 Y22 Z-4 S0 G1 X44 S128 G0 X44 Y22.1 S0 G1 X43.7 S128 G0 X43.7 Y22.2 S0 G1 X44 S128 G0 X44 Y22.3 S0 G1 X43.7 S128 G0 X43.6 Y22.4 S0 G1 X44.1 S128 G0 X44.3 Y22.5 S0 G1 X42.8 S128 G0 X6.5 Y22.5 S0 G1 X39.0 S255 G0 X39 Y22.6 S0 G1 X39.1 S128 G0 X42 Y22.6 S0 G1 X42.4 S128 G0 X42.8 Y22.6 S0 G1 X43.3 S128 G0 X43.5 Y22.6 S0 G1 X44.2 S128 G0 X44 Y22.7 S0 G1 X43.7 S128 G0 X43.1 Y22.7 S0 G1 X42.9 S128 G0 X42.5 Y22.7 S0 G1 X41.8 S128 G0 X43 Y22.8 S0 G1 X43.1 S128 G0 X43.7 Y22.8 S0 G1 X44 S128 G0 X44 Y22.9 S0 G1 X43.7 S128 G0 X43.3 Y22.9 S0 G1 X43 S128 G0 X43 Y23 S0 G1 X43.3 S128 G0 X43.7 Y23 S0 G1 X44 S128 G0 X44 Y23.1 S0 G1 X43.7 S128 G0 X43.4 Y23.1 S0 G1 X43.1 S128 G0 X43.2 Y23.2 S0 G1 X43.4 S128 G0 X43.7 Y23.2 S0 G1 X44 S128 G0 X44 Y23.3 S0 G1 X43.7 S128 G0 X43.5 Y23.3 S0 G1 X43.2 S128 G0 X43.3 Y23.4 S0 G1 X43.6 S128 G0 X43.8 Y23.4 S0 G1 X44 S128 G0 X44 Y23.5 S0 G1 X43.7 S128 G0 X43.6 Y23.5 S0 G1 X43.3 S128 G0 X43.4 Y23.6 S0 G1 X44 S128 G0 X44 Y23.7 S0 G1 X43.5 S128 G0 X43.5 Y23.8 S0 G1 X44 S128 G0 X44 Y23.9 S0 G1 X43.6 S128 G0 X43.9 Y24.7 Z-3 S0 G1 X43 S128 G0 X42.9 Y24.8 S0 G1 X43.2 S128 G0 X43.5 Y24.8 S0 G1 X44 S128 G0 X44.1 Y24.9 S0 G1 X43.8 S128 G0 X43.1 Y24.9 S0 G1 X42.9 S128 G0 X43.8 Y25 S0 G1 X44.2 S128 G0 X44.2 Y25.1 S0 G1 X43.9 S128 G0 X6.5 Y25.2 S0 G1 X39.0 S255 G0 X43.9 Y25.2 S0 G1 X44.2 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S128 G0 X43.7 Y28.4 S0 G1 X44 S128 G0 X44 Y28.5 S0 G1 X43.7 S128 G0 X43.8 Y28.6 S0 G1 X44.1 S128 G0 X44.1 Y28.7 S0 G1 X43.8 S128 G0 X43.8 Y28.8 S0 G1 X44.1 S128 G0 X44.1 Y28.9 S0 G1 X43.8 S128 G0 X43.7 Y29 S0 G1 X44.1 S128 G0 X44 Y29.1 S0 G1 X43.7 S128 G0 X43.2 Y29.1 S0 G1 X42.9 S128 G0 X43 Y29.2 S0 G1 X43.9 S128 G0 X43.8 Y29.3 S0 G1 X43.1 S128 G0 X44.2 Y30.1 Z-1 S0 G1 X43 S128 G0 X43.2 Y30.2 S0 G1 X44 S128 G0 X43.8 Y30.3 S0 G1 X43.5 S128 G0 X43.5 Y30.4 S0 G1 X43.8 S128 G0 X43.8 Y30.5 S0 G1 X43.5 S128 G0 X6.5 Y30.6 S0 G1 X39.0 S255 G0 X43.5 Y30.6 S0 G1 X43.8 S128 G0 X43.8 Y30.7 S0 G1 X43.5 S128 G0 X41.8 Y30.8 S0 G1 X42.5 S128 G0 X43.5 Y30.8 S0 G1 X43.8 S128 G0 X43.8 Y30.9 S0 G1 X43.5 S128 G0 X43.5 Y31 S0 G1 X43.8 S128 G0 X43.8 Y31.1 S0 G1 X43.5 S128 G0 X43.5 Y31.2 S0 G1 X43.8 S128 G0 X43.8 Y31.3 S0 G1 X43.5 S128 G0 X43.5 Y31.4 S0 G1 X43.8 S128 G0 X43.8 Y31.5 S0 G1 X43.5 S128 G0 X43 Y31.6 S0 G1 X43.2 S128 G0 X43.6 Y31.6 S0 G1 X43.8 S128 G0 X43.8 Y31.7 S0 G1 X43.1 S128 G0 X43.2 Y31.8 S0 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X43.7 Y34.3 S0 G1 X43.4 S128 G0 X42.7 Y34.3 S0 G1 X42.4 S128 G0 X42.4 Y34.4 S0 G1 X42.7 S128 G0 X43.4 Y34.4 S0 G1 X43.7 S128 G0 X43.6 Y34.5 S0 G1 X43.3 S128 G0 X42.8 Y34.5 S0 G1 X42.5 S128 G0 X42.6 Y34.6 S0 G1 X43.5 S128 G0 X43.4 Y34.7 S0 G1 X42.7 S128 G0 X43.7 Y35.5 Z1 S0 G1 X42.5 S128 G0 X42.6 Y35.6 S0 G1 X43.6 S128 G0 X43.3 Y35.7 S0 G1 X43 S128 G0 X43 Y35.8 S0 G1 X43.2 S128 G0 X43.2 Y35.9 S0 G1 X43 S128 G0 X6.5 Y36 S0 G1 X39.0 S255 G0 X43 Y36 S0 G1 X43.2 S128 G0 X43.2 Y36.1 S0 G1 X43 S128 G0 X43 Y36.2 S0 G1 X43.3 S128 G0 X43.2 Y36.3 S0 G1 X43 S128 G0 X43 Y36.4 S0 G1 X43.2 S128 G0 X43.2 Y36.5 S0 G1 X43 S128 G0 X43 Y36.6 S0 G1 X43.2 S128 G0 X43.2 Y36.7 S0 G1 X43 S128 G0 X43 Y36.8 S0 G1 X43.3 S128 G0 X43.3 Y36.9 S0 G1 X43 S128 G0 X42.5 Y37 S0 G1 X42.7 S128 G0 X43 Y37 S0 G1 X43.2 S128 G0 X43.2 Y37.1 S0 G1 X42.9 S128 G0 X42.8 Y37.1 S0 G1 X42.5 S128 G0 X42.6 Y37.2 S0 G1 X43.2 S128 G0 X43.2 Y37.3 S0 G1 X42.8 S128 G0 X42.9 Y37.4 S0 G1 X43.2 S128 G0 X42.4 Y38.2 Z2 S0 G1 X43.7 S128 G0 X43.6 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Y44.7 S0 G1 X42.6 S128 G0 X42.6 Y44.8 S0 G1 X42.9 S128 G0 X43.2 Y44.8 S0 G1 X43.5 S128 G0 X43.5 Y44.9 S0 G1 X43.2 S128 G0 X42.9 Y44.9 S0 G1 X42.7 S128 G0 X42.7 Y45 S0 G1 X43 S128 G0 X43.2 Y45 S0 G1 X43.5 S128 G0 X43.5 Y45.1 S0 G1 X43.2 S128 G0 X43.1 Y45.1 S0 G1 X42.8 S128 G0 X42.9 Y45.2 S0 G1 X43.5 S128 G0 X43.5 Y45.3 S0 G1 X43 S128 G0 X43 Y45.4 S0 G1 X43.5 S128 G0 X43.5 Y45.5 S0 G1 X43.1 S128 G0 X43.3 Y46.3 Z5 S0 G1 X42.5 S128 G0 X42.4 Y46.4 S0 G1 X43.4 S128 G0 X43.5 Y46.5 S0 G1 X43.2 S128 G0 X42.6 Y46.5 S0 G1 X42.3 S128 G0 X43.3 Y46.6 S0 G1 X43.6 S128 G0 X43.7 Y46.7 S0 G1 X43.4 S128 G0 X6.5 Y46.8 S0 G1 X39.0 S255 G0 X43.4 Y46.8 S0 G1 X43.7 S128 G0 X43.7 Y46.9 S0 G1 X43.4 S128 G0 X43.4 Y47 S0 G1 X43.7 S128 G0 X43.6 Y47.1 S0 G1 X43.3 S128 G0 X43.2 Y47.2 S0 G1 X43.6 S128 G0 X43.4 Y47.3 S0 G1 X42.6 S128 G0 X42.5 Y47.4 S0 G1 X43.3 S128 G0 X42.7 Y47.5 S0 G1 X42.5 S128 G0 X42.5 Y47.6 S0 G1 X42.7 S128 G0 X42.7 Y47.7 S0 G1 X42.5 S128 G0 X42.5 Y47.8 S0 G1 X42.7 S128 G0 X42.7 Y47.9 S0 G1 X42.5 S128 G0 X42.5 Y48 S0 G1 X42.7 S128 G0 X42.8 Y48.1 S0 G1 X42.5 S128 G0 X42.5 Y48.2 S0 G1 X43.5 S128 G0 X42.7 Y49 Z6 S0 G1 X43.4 S128 G0 X43.5 Y49.1 S0 G1 X42.6 S128 G0 X42.5 Y49.2 S0 G1 X42.8 S128 G0 X43.3 Y49.2 S0 G1 X43.6 S128 G0 X43.7 Y49.3 S0 G1 X43.4 S128 G0 X42.8 Y49.3 S0 G1 X42.5 S128 G0 X42.4 Y49.4 S0 G1 X42.7 S128 G0 X43.4 Y49.4 S0 G1 X43.7 S128 G0 X43.7 Y49.5 S0 G1 X43.5 S128 G0 X42.7 Y49.5 S0 G1 X42.4 S128 G0 X6.5 Y49.5 S0 G1 X39.0 S255 G0 X42.3 Y49.6 S0 G1 X42.7 S128 G0 X43.5 Y49.6 S0 G1 X43.7 S128 G0 X43.7 Y49.7 S0 G1 X43.5 S128 G0 X42.7 Y49.7 S0 G1 X42.3 S128 G0 X42.3 Y49.8 S0 G1 X42.7 S128 G0 X43.4 Y49.8 S0 G1 X43.7 S128 G0 X43.7 Y49.9 S0 G1 X43.4 S128 G0 X42.7 Y49.9 S0 G1 X42.3 S128 G0 X42.4 Y50 S0 G1 X43.6 S128 G0 X43.5 Y50.1 S0 G1 X42.4 S128 G0 X42.4 Y50.2 S0 G1 X42.7 S128 G0 X42.7 Y50.3 S0 G1 X42.4 S128 G0 X42.4 Y50.4 S0 G1 X42.7 S128 G0 X42.7 Y50.5 S0 G1 X42.5 S128 G0 X42.5 Y50.6 S0 G1 X42.8 S128 G0 X42.9 Y50.7 S0 G1 X42.6 S128 G0 X42.7 Y50.8 S0 G1 X43 S128 G0 X43.6 Y50.9 S0 G1 X42.9 S128 G0 X42.8 Y51.7 Z7 S0 G1 X42.7 S128 G0 X42.6 Y51.8 S0 G1 X42.9 S128 G0 X43 Y51.9 S0 G1 X42.7 S128 G0 X42.7 Y52 S0 G1 X43 S128 G0 X43 Y52.1 S0 G1 X42.7 S128 G0 X6.5 Y52.2 S0 G1 X39.0 S255 G0 X42.8 Y52.2 S0 G1 X43.1 S128 G0 X43.1 Y52.3 S0 G1 X42.9 S128 G0 X42.9 Y52.4 S0 G1 X43.2 S128 G0 X43.2 Y52.5 S0 G1 X42.9 S128 G0 X43 Y52.6 S0 G1 X43.2 S128 G0 X43.3 Y52.7 S0 G1 X43 S128 G0 X43.1 Y52.8 S0 G1 X43.4 S128 G0 X43.4 Y52.9 S0 G1 X43.1 S128 G0 X43.2 Y53 S0 G1 X43.4 S128 G0 X43.5 Y53.1 S0 G1 X43.2 S128 G0 X43.2 Y53.2 S0 G1 X43.5 S128 G0 X43.6 Y53.3 S0 G1 X43.3 S128 G0 X43.4 Y53.4 S0 G1 X43.6 S128 G0 X43.7 Y53.5 S0 G1 X43.3 S128 G0 X42.3 Y53.6 S0 G1 X43.7 S128 G0 X42.6 Y54.4 Z8 S0 G1 X43.4 S128 G0 X43.5 Y54.5 S0 G1 X42.5 S128 G0 X42.4 Y54.6 S0 G1 X42.7 S128 G0 X43.4 Y54.6 S0 G1 X43.6 S128 G0 X43.7 Y54.7 S0 G1 X43.4 S128 G0 X42.6 Y54.7 S0 G1 X42.3 S128 G0 X42.3 Y54.8 S0 G1 X42.6 S128 G0 X43.5 Y54.8 S0 G1 X43.7 S128 G0 X43.7 Y54.9 S0 G1 X43.5 S128 G0 X42.6 Y54.9 S0 G1 X42.3 S128 G0 X6.5 Y54.9 S0 G1 X39.0 S255 G0 X42.3 Y55 S0 G1 X42.6 S128 G0 X43.5 Y55 S0 G1 X43.7 S128 G0 X43.7 Y55.1 S0 G1 X43.4 S128 G0 X42.7 Y55.1 S0 G1 X42.4 S128 G0 X42.5 Y55.2 S0 G1 X42.8 S128 G0 X43.2 Y55.2 S0 G1 X43.6 S128 G0 X43.5 Y55.3 S0 G1 X42.6 S128 G0 X42.7 Y55.4 S0 G1 X43.4 S128 G0 X43.3 Y55.5 S0 G1 X42.7 S128 G0 X42.5 Y55.6 S0 G1 X42.9 S128 G0 X43.2 Y55.6 S0 G1 X43.5 S128 G0 X43.6 Y55.7 S0 G1 X43.3 S128 G0 X42.8 Y55.7 S0 G1 X42.5 S128 G0 X42.4 Y55.8 S0 G1 X42.7 S128 G0 X43.4 Y55.8 S0 G1 X43.7 S128 G0 X43.7 Y55.9 S0 G1 X43.4 S128 G0 X42.7 Y55.9 S0 G1 X42.4 S128 G0 X42.4 Y56 S0 G1 X42.7 S128 G0 X43.4 Y56 S0 G1 X43.7 S128 G0 X43.6 Y56.1 S0 G1 X43.4 S128 G0 X42.7 Y56.1 S0 G1 X42.5 S128 G0 X42.6 Y56.2 S0 G1 X42.8 S128 G0 X43.2 Y56.2 S0 G1 X43.6 S128 G0 X43.5 Y56.3 S0 G1 X42.6 S128 G0 X43.1 Y57.1 Z9 S0 G1 X42.4 S128 G0 X42.4 Y57.2 S0 G1 X43.3 S128 G0 X43.4 Y57.3 S0 G1 X43.1 S128 G0 X43.2 Y57.4 S0 G1 X43.5 S128 G0 X43.6 Y57.5 S0 G1 X43.3 S128 G0 X6.5 Y57.6 S0 G1 X39.0 S255 G0 X43.3 Y57.6 S0 G1 X43.6 S128 G0 X43.7 Y57.7 S0 G1 X43.4 S128 G0 X43.4 Y57.8 S0 G1 X43.7 S128 G0 X43.7 Y57.9 S0 G1 X43.4 S128 G0 X42.5 Y58 S0 G1 X43.7 S128 G0 X43.7 Y58.1 S0 G1 X43.3 S128 G0 X42.8 Y58.1 S0 G1 X42.4 S128 G0 X42.3 Y58.2 S0 G1 X42.7 S128 G0 X43.4 Y58.2 S0 G1 X43.7 S128 G0 X43.7 Y58.3 S0 G1 X43.4 S128 G0 X42.6 Y58.3 S0 G1 X42.3 S128 G0 X42.3 Y58.4 S0 G1 X42.6 S128 G0 X43.4 Y58.4 S0 G1 X43.7 S128 G0 X43.7 Y58.5 S0 G1 X43.4 S128 G0 X42.6 Y58.5 S0 G1 X42.3 S128 G0 X42.3 Y58.6 S0 G1 X42.6 S128 G0 X43.4 Y58.6 S0 G1 X43.7 S128 G0 X43.7 Y58.7 S0 G1 X43.3 S128 G0 X42.7 Y58.7 S0 G1 X42.3 S128 G0 X42.4 Y58.8 S0 G1 X42.7 S128 G0 X43.3 Y58.8 S0 G1 X43.6 S128 G0 X43.5 Y58.9 S0 G1 X43.2 S128 G0 X42.8 Y58.9 S0 G1 X42.5 S128 G0 X42.6 Y59 S0 G1 X43.4 S128 G0 X43.2 Y59.1 S0 G1 X42.8 S128 G0 X41.2 Y59.8 Z10 S0 G1 X42.3 S128 G0 X43.1 Y59.8 S0 G1 X43.7 S128 G0 X43.8 Y59.9 S0 G1 X43 S128 G0 X42.3 Y59.9 S0 G1 X41.1 S128 G0 X41.6 Y60 S0 G1 X41.9 S128 G0 X42.9 Y60 S0 G1 X43.1 S128 G0 X43.6 Y60 S0 G1 X43.9 S128 G0 X44 Y60.1 S0 G1 X43.7 S128 G0 X43.1 Y60.1 S0 G1 X42.8 S128 G0 X41.9 Y60.1 S0 G1 X41.6 S128 G0 X41.6 Y60.2 S0 G1 X41.9 S128 G0 X42.7 Y60.2 S0 G1 X43 S128 G0 X43.7 Y60.2 S0 G1 X44.1 S128 G0 X44.1 Y60.3 S0 G1 X43.8 S128 G0 X43 Y60.3 S0 G1 X42.7 S128 G0 X41.9 Y60.3 S0 G1 X41.6 S128 G0 X6.5 Y60.3 S0 G1 X39.0 S255 G0 X41.6 Y60.4 S0 G1 X41.9 S128 G0 X42.7 Y60.4 S0 G1 X42.9 S128 G0 X43.8 Y60.4 S0 G1 X44.1 S128 G0 X44.1 Y60.5 S0 G1 X43.8 S128 G0 X42.9 Y60.5 S0 G1 X42.7 S128 G0 X41.9 Y60.5 S0 G1 X41.6 S128 G0 X41.6 Y60.6 S0 G1 X41.9 S128 G0 X42.7 Y60.6 S0 G1 X42.9 S128 G0 X43.9 Y60.6 S0 G1 X44.1 S128 G0 X44.1 Y60.7 S0 G1 X43.9 S128 G0 X42.9 Y60.7 S0 G1 X42.7 S128 G0 X41.9 Y60.7 S0 G1 X41.6 S128 G0 X41.6 Y60.8 S0 G1 X41.9 S128 G0 X42.7 Y60.8 S0 G1 X42.9 S128 G0 X43.9 Y60.8 S0 G1 X44.1 S128 G0 X44.1 Y60.9 S0 G1 X43.9 S128 G0 X42.9 Y60.9 S0 G1 X42.7 S128 G0 X41.9 Y60.9 S0 G1 X41.6 S128 G0 X41.6 Y61 S0 G1 X41.9 S128 G0 X42.7 Y61 S0 G1 X42.9 S128 G0 X43.9 Y61 S0 G1 X44.1 S128 G0 X44.1 Y61.1 S0 G1 X43.8 S128 G0 X42.9 Y61.1 S0 G1 X42.7 S128 G0 X41.9 Y61.1 S0 G1 X41.6 S128 G0 X41.6 Y61.2 S0 G1 X41.9 S128 G0 X42.7 Y61.2 S0 G1 X42.9 S128 G0 X43.8 Y61.2 S0 G1 X44.1 S128 G0 X44.1 Y61.3 S0 G1 X43.8 S128 G0 X43 Y61.3 S0 G1 X42.7 S128 G0 X41.9 Y61.3 S0 G1 X41.6 S128 G0 X41.1 Y61.4 S0 G1 X41.4 S128 G0 X41.6 Y61.4 S0 G1 X41.9 S128 G0 X42.7 Y61.4 S0 G1 X43 S128 G0 X43.7 Y61.4 S0 G1 X44.1 S128 G0 X44 Y61.5 S0 G1 X43.7 S128 G0 X43.1 Y61.5 S0 G1 X42.8 S128 G0 X41.9 Y61.5 S0 G1 X41.2 S128 G0 X41.3 Y61.6 S0 G1 X41.9 S128 G0 X42.9 Y61.6 S0 G1 X43.2 S128 G0 X43.6 Y61.6 S0 G1 X43.9 S128 G0 X43.8 Y61.7 S0 G1 X43 S128 G0 X41.9 Y61.7 S0 G1 X41.5 S128 G0 X43.2 Y61.8 S0 G1 X43.6 S128 M5
And here's the result. The numbers refer to the distance in millimeters above and below where I set the focal point. It appears to stay in focus for about 2mm (+/- 1mm). I guess this implies that if I want to cut something thicker than 2 mm that I want to do multiple passes and adjust the Z height between passes.
Now that I've got the focus calibration done I need to start practicing on different material to figure out speed and power settings for cutting.
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