Mike B

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About Mike B

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  1. Here are the top and bottom outlines. The instrument is rotated slightly - that will be fixed in later analysis.
  2. Here is the first post on analysis of the Betts Stradivari. I've built image processing tools to gather data about the instrument. The rib height was the easiest first plot to create - it matches well with https://www.roger-hargrave.de/PDF/Artikel/Strad/Artikel_1989_05_Stradivari_Antonio_Betts_PDF.pdf The x axis is in units of CT scan frame number and has not yet been translated to distance units. I'll post some additional plots - if there are any specific requests, I'm happy to try to fill them! This tool will let me perform the same analysis of other instrument
  3. The viewer is super simple - here is the code. It literally loads all the photos necessary for a 360 degree view. <div class="spin-photo spritespin-instance with-canvas" id="instrumentSpinner" data-photos="{&quot;thumbs&quot;:[&quot;https://storage.googleapis.com/snoofa-tenant-amati/item/6636-1_spin/images/IMG_01.jpg?v=37725504&quot;,&quot;https://storage.googleapis.com/snoofa-tenant-amati/item/6636-1_spin/images/IMG_02.jpg?v=1932658926&quot;,&quot;https://storage.googleapis.com/snoofa-tenant-amati/item/6636-1_spin/images/IMG_03.jpg?v=3956987992&quot;,&
  4. That is a deep scratch of memory serves
  5. The real utility is that the images I provided can (and will) be 3D printed. This should be a useful study aid. In addition, corresponding arching templates can be machined, laser cut, or printed.
  6. Here are several figures I made today that show the Betts Strad's back arching. These were taken from a video of a CT scan. The plots are in units of "voxels" and I've not converted them to something useful just yet. A photo of the Betts violin's back is included for comparison.
  7. Here is another plot that is more useful for comparison with the image of the Betts violin. I've tried to position the lighting so that shadows emphasize the curves a bit better. In this image, you can see the sampling a bit better - these are the "raw" edges in the CT scan images. I'm doing this in Matlab, so I have pretty complete control of processing - I'm trying to minimize processing by not exporting to Meshlab and not using any interpolation. I'll be able to output this to an OBJ file and, hopefully, machine it out of high density foam. If I have time, I'll do that this weekend. In addi
  8. Im curious about how I might modify the plot to better show the channeling.
  9. Here is a plot that includes contour lines. Again, the pixel/voxel scale is not correct in this image.
  10. Here are two figures I made this evening that show the Betts Strad's back arching. These were taken from a video of a CT scan. The plots are in units of "voxels" and I've not converted them to something useful just yet.
  11. I’ll look into the latest tools for changing orientation and the support connections. They can typically be cleaned off easily. The software automatically optimized the supports in this case. I have some friends who have good expertise in using this printer and I’ll ask them for suggestions. Mike
  12. I'm adding one of the LOC photos of the scroll for reference.
  13. The Form3 supports OBJ and STL. I'm happy to print or help print as time allows - pleased send me a message if you'd like to give something a try!
  14. I've printed the scroll from the Betts Stradivarius violin (https://loc.gov/item/ihas.200155591) using a Form3 SLA (www.formlabs.com). The printer is owned by Nova Labs (www.nova-labs.org), the local maker space. Overall, this print cost around $25 in materials. This model was built from CT scans of the Betts Strad and some excess smoothing in the surface reconstruction has caused "artifacts" that need to be handled. The most obvious is "smoothing" of the string indents in the nuts. This printer is capable of printing more detail than the current model provides, so there is room for impr