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Urban Luthier

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Everything posted by Urban Luthier

  1. I learn something new every time I watch your videos. Simply extraordinary. Please keep sharing!
  2. Good luck with the Exhibit Guy - wish i could be there to see you guys again - the last one was a fantastic meetup
  3. 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
  4. Finally downloaded - Great article Eric thank you for sharing.
  5. thank you both! image of the tailpiece and tie off
  6. ... or you can wait until you've done the first turn and clean the throat out then. (with either a flat gouge as Jacob mentioned, thin knife or a needle rasp.
  7. Think this is a viola d'amore converted to a viola by JVB with a nice Amati head with blackened chamfers to boot! Nice photos in the strad varnish book. you can hear it on this recording
  8. thanks for your update - I'm interested in LEDs to replace my CFL tubes for varnish curing and tanning. can anyone recommend commercially available LEDs they have tried that work?
  9. 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
  10. 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.
  11. 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.
  12. 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.
  13. in this case the authors mean the colour is in the varnish close to the wood - seeps into the wood pores. So what ever ground is under the coloured varnish didn't fill the wood pores completely
  14. The book is excellent. Mine arrived last week. Fine essays from a couple of members here. Varnish analysis is useful as well. Key takeaways include the use of lead as a drying and or colouring agent. Iron could also be a colouring agent as well. Colour is close to the wood.
  15. Tailpiece and tailgut. What a pain in the you know what to tie off.
  16. 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.
  17. Yes, but apparently it varies from province to province.
  18. 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
  19. thanks @Michael Richwine and @David Burgess @David Burgess - if you feel comfortable sharing - I'd like to learn more about your point light experiments - your results sound promising. the reference to candlelight is interesting - wondering if a low light point light like a candle (10 or so Lumens?) has anything to do with it - less light 'ray-traced' around the room.
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