https://github.com/techplexengineer/svg2laser

Prepare SVGs generated from CAD models for laser cutting on Epilog Helix.
https://github.com/techplexengineer/svg2laser

flyio inkscape svg vector

Last synced: about 1 month ago
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Prepare SVGs generated from CAD models for laser cutting on Epilog Helix.

• Host: GitHub
• URL: https://github.com/techplexengineer/svg2laser
• Owner: TechplexEngineer
• Created: 2021-10-02T14:57:19.000Z (about 3 years ago)
• Default Branch: main
• Last Pushed: 2022-09-15T18:58:03.000Z (over 2 years ago)
• Last Synced: 2024-04-14T11:39:16.768Z (8 months ago)
• Topics: flyio, inkscape, svg, vector
• Language: Go
• Homepage: https://svg2laser.fly.dev/
• Size: 1.37 MB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

        
svg2laser

=========

## Goal

Streamline hte process of cutting FRC Robotics prototypes designed in Onshape on an Epilog Helix 18"x24" laser cutter.

This repo contains a number of tests and ideas, but nothing works great yet.

## Data flow

1. Possible sources (Suppored via Onshape export):

    - PDF

    - DWG -- obscure format

    - DXF -- obscure format

    - DWT -- obscure format

    - SVG ==> Easy to modify

    - PNG -- eliminated, not vector

    - JPEG -- eliminated, not vector

2. Set line thickness to .001"

    Math and text substitution will get us most of the way there

3. Convert SVG to Postscript

inkscape input.svg --export-filename=output.ps

4. Send postscript through epilog postprocessor

liblasercut

## Inspiration

- LibLaserCut

- Lathser

- ctrl-cut

## Notes

> The initial value for SVG user coordinates is that 1 user unit equals one CSS "px" (pixel) unit. By CSS standards, a "px" unit is exactly equal to 1/96th of an "in" (inch) unit. If you scale your SVG with transforms or a viewBox attribute, all the length units scale accordingly, so the ratio remains constant.

src: https://stackoverflow.com/a/23096315/429544

1 (svg user coordinate) = 1 (css px)

1 (css px) = 1/96 (inch) ---- or ---- 96 (css px) = 1 (inch)

if I have .3 (svg user coordinate) that is the same as .3 (css px)

So to convert .3 (css px) to inches we divide by 96

.3/96 = 0.003125 (inch)

This seems wrong because if one uses inkscape to change stroke-width to .001" the resulting file has .3 as the stroke width

So maybe 96 is wrong....

What value of inches is actually per css px

.3 (css px) / x (css px/inch) = .001 (inch)

Cross multiply (both sides by x) and divide (.001)

.3 / .001 = x = 300

How can we calculate the resolution if its not a fixed value...

From a pseudocode perspective:

Take a hypothetical file

```