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@@ -64,14 +64,19 @@ keeps the focal plane of the laser exactly on the exposed surface. |
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However, making custom mirrors in such a shape at home is not really feasible |
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(Someone who has access to a lathe: this would essentially be a 45° bevel |
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on the inside of a large diameter stainless steel pipe with a wall thickness |
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of about 2-3mm. Then mirror finish polishing this bevel. I don't have |
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access to a lathe though :/). |
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However, making custom mirrors in such a shape at home is not easy. |
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We want to build this machine with minimal accessible tools, so this |
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is a hurdle. |
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Possible ways: |
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* With a lathe: this would essentially be a 45° bevel on the inside of a |
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large diameter stainless steel pipe with a wall thickness of about 2-3mm. |
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Then mirror finish polishing this bevel. Stainless steel or aluminum are |
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both nicely polisheable, so these could be materials of choice. |
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* [John M. suggests on his blog][NaN-cone-mirror] to build such a mirror using |
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laser cut parts that, snapped together, defining the shape. |
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We want to build this machine with minimal accessible tools, so these techniques |
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have to be explored if they can be done with minimal tools. Till then, let's |
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see what else we can do. |
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#### Straight mirror line exposure |
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We can simplify and use a straight mirror to project downwards to get a line. |
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@@ -259,4 +264,5 @@ go inside the case. |
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[arc-project-vid]: https://youtu.be/8tyT4CI-1io |
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[ldgraphy-vid]: https://youtu.be/G9-JK2Nc7w0 |
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[hardware]: ./hardware#cut-pattern |
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[f-theta-images]: https://www.google.com/images?q=f+theta+lens
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[f-theta-images]: https://www.google.com/images?q=f+theta+lens |
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[NaN-cone-mirror]: http://notanumber.net/archives/228/circular-mirror-idea-laser-lithography
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