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Sorry! Scaling again!

Discussion in 'CAM' started by CJ Brown, Jun 13, 2022.

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  1. CJ Brown

    CJ Brown New
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    Just discovered this wonderful tool to drive my Ox style CNC router.

    I'm using Inkscape 1.2 (1:1.2+202206011327+fc4e4096c5) on a Linux box.

    Linux Mint (Linux Swift2 5.13.0-48-generic #54~20.04.1-Ubuntu SMP Thu Jun 2 23:37:17 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux)

    All was well until I figured out I had a scaling problem. Inkscape SVG import was not being imported correctly to size.

    Brief look at this forum hasn't got me working. I'm pretty sure Inkscape is exporting SVG at 96dpi.

    I've got a feeling there are various new Bugs / Features in Inkscape 1.2 that might be to blame. Especially the "Scale" feature (mm per user unit???? Default 1.0). Partly why I've abandoned other older CAM tools.

    Any help gratefully received.
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Include sample files for assistance :)
     
  3. CJ Brown

    CJ Brown New
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    Thanks for help. Uploading simple 100mm square. Appears in O/B CAM as just over ~92 mm. Also attaching the workspace file for this. The real job a little more complex :)
     

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  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Thanks, good test with known dimensions :)

    Pushed an update, do a forced refresh of your browser on cam.openbuilds.com with ctrl+f5 / shift+f5 and it should work

    One other note, your SVG is not quite 100mm. Its 99.77x with a stroke of 0.23ish (99.77+0.23=100) - keep in mind to keep stroke widths smaller or zero as Inkscape adds it to the dimensions to display correctly but it will affect your final dimensions as CAMs only look at the shape
    Also it's a RECT not a Path (;


    upload_2022-6-14_8-46-6.png

    As such, post-update OpenBuildsCAM sees it as 99.77 now which is correct

    upload_2022-6-14_8-48-57.png
     

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  5. CJ Brown

    CJ Brown New
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    Many thanks. That's me working now. Also good advice on stroke width. I have wondered about that. The real job is formed using closed paths.
     
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  6. CJ Brown

    CJ Brown New
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    How can I best help this project?
     
    Peter Van Der Walt likes this.
  7. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Just keep on OpenBuilds'ing - for example make some cool projects and post them on Projects | OpenBuilds
     

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