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Urban Luthier

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Posts posted by Urban Luthier

  1. Last go I linked x20w UV bulbs end to end and - 3ft total. I use a grow tent with a reflective interior. i hung the violin with a string attached to a peg which was suspended from a cheep slow speed synchronous motor bolted to the top of the tent. This  allows the violin to rotate once every minute or so in-front of the UV bulbs. Varnish dried in 24 hrs. Since my grow tent is large, the temperature never really got above 25-26 degrees Celsius. 

    I learned the hard way - if you use a varnish with a long open time (4-5 hrs) a drying cabinet that is too hot can cause the varnish to move around before it starts to set

  2. 17 hours ago, Jerry Lynn said:

    By printing you mean to export a file for a 3d printer, that’s included in the personal license.  Right click on the body you want to print and hit save as mesh, then import to your slicer of choice.  The big differences between the personal and the paid subscription is the personal is capped at 10 active documents (you can archive as many as you want), and for CNC cutting tools  ATCs aren’t supported. Rapids are limited to cutting speed.    While I love fusion, and I do a lot with it, I usually recommend a different CAM package for beginners. 

    I should have been more clear - yes 3d printing is limited (you use to be able to print directly to a 3d printer hooked up to you computer)

    But also note if you plan to use fusion as a drawing tool (the main use for me at least) one can't export 2D drawings as PDFs with the enthusiast licence. You can print a single sheet apparently but I haven't tried it. I usually export a dxf from fusion and bring it into ACAD to create PDFs

  3. Autodesk Fusion is a good one to start with. It is free to use as an enthusiast - however to print anything you'll need to cough up for a subscription. The enthusiasts licences is a good way to go to figure things out and then pay for a single month if you need to do some printing

    I'm lucky - I sat across from the team who implemented the g-code sectioning and UI into Fusion when I worked at ADSK.

  4. 17 hours ago, Crimson0087 said:

    In copying templates from Stradivarius and del gesu I see that they are clearly not symmetrical in shape or in arching patterns....do most people attempt to replicate this asymmetry or do most use their dimensions yet strive for symmetry? Would they have not been trying to make a symmetrical shape?

    I see Jacob got to the heart of it - but read Hargrave's del Gesu book on his site. Violins necks were nailed to the rib garland before the body outline was made. To take the body outline, the rib garland was attached to the back through the locating pins. This allows the neck to pivot to match the centre line of the back before the outline is scribed. Whether the locating pins were used or not, it is the pivot or twist that Jacob mentions above that causes the asymmetry - you can see this in every Strad poster - one bout will be higher than the other.  

  5. 4 hours ago, Gary M said:

    I also just received both of the Bergonzi Strad posters and have started the process of transcribing them to actual plans

    it is worth noting that neither the Kreisler or Barron Knoop precisely fit the two surviving Bergonzi forms. The book illustrated the full size 3d scans of the forms with the rib outlines of both instruments. 

    The digital files supplied with the book include PDFs of the outlines and arching that can be printed 1:1. 


    On 6/25/2021 at 9:32 PM, Urban Luthier said:

    And there is a book on the way from S&Z featuring the Knoop and Kreisler

    I ordered mine way back and it arrived last week. Excellent essays from a couple of members here!

    It also comes with digital files featuring high res 1:1 PDFs of the rib outlines and arching etc. Varnish articles are interesting as well. Iron (red earth) has been suggested as the red pigment and possible Lead as either a colouring agent and or dryer. Colour appears to be quite close to the wood.

    Lots to learn from. Highly recommended. 

  7. On 8/20/2022 at 5:41 PM, Michael Richwine said:

    I ordered some "soft white" 2700K

    I ordered the soft white 2700K also and it arrived yesterday. It is a very bright light 840lumens first impression is that the light reminds me of higher quality halogen lighting - the kind one sees in galleries. It is too bright for my shop as is - i'd need a dimmer. Wondering if the colour rendering index is maintained if the light is dimmed

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