Luis Martins

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Everything posted by Luis Martins

  1. Anyone got stopped at airport security after applying ground?!?
  2. For those who haven't experienced working with a CNC, please note that machining a piece of metal to exact specifications is a hard job. Making 2 metal parts within 0,01mm requires an extremely well controlled environment with lots of tool cooling and in some cases it's virtually impossible to get the intended resultados with other methods than electro erosion. Wood isn't as stable as metal, specially soft woods like pine, so the idea of getting systematically identical pine parts out of a CNC seams an herculean job, and a waste of time and raw materials. I'm sure @Don Noon experienced several difficulties "just" by making molds to exact measurements and probably had to fine tune everything to get them right. Final scraping will always be needed and artistry will come in play. Sorry for the long comments, I'm obviously not a great writer
  3. I'd like to add that art doesn't necessarily has to be handwork. And aesthetic changes can easily be performed on pre made CNC parts.
  4. My point of view is simple, CNC is the same as a band saw, mini drill, or any other powered tool for that matter. They are just tools that might help you do a better and faster job. You can build 500 identical tops with a CNC and all will have different accoustic results since no 2 pieces of wood are the same and there are so many others variables involved. Some of those variables, like temperature and humidity, are present even while cnc'ing. The end result will be set by the person finishing and doing the final tweaking, and not by the means used to get there, unless you're expecting a finished CNC part without further handwork.... But that's just me...
  5. You have no idea how much I'm laughing right now!!! Has anyone tried with one of those machines that chop trees down and remove bark?!!!!!! Sorry @Goran74 but these moments are priceless
  6. Genius at work @David Burgess. That's brilliant!!!! Can you do it with a chain saw too?!?!?
  7. That's my opinion too. I do prefer when there are not two obvious layers but some sort of blending between the varnish and the wood. When looking at your photo, Philip, I see two clearly defined regions of different reflection/refraction index. This gets more obvious when varnishing an extremely smooth surface, like applying varnish to glass if the refraction index isn't close you get a milky or cloudy result. When I compare to @Jim Bress photo, the varnish goes with the wood texture, instead of sitting on top of it, as when you apply some varnish in a frosted glass it suddenly becomes almost clear and more interesting than before... This is really hard to put into words!
  8. It's extremely difficult to photograph instruments, specially when the surface of the varnish is mirror finished, a large percentage of the light reflects on the surface of the varnish and obscures the wood.
  9. In any case, the eventual criticism might not be related to the viola itself, but in artistic choices. On another matter, do you have instruments being played here in Portugal? I'm quite curios to see, and hear one of yours live. Your photos are always absolutely beautiful, so I can only image how can the actual instruments beat that. And I'm sure they do!
  10. The milky might be considered a negative aspect. Like some frosting on a window glass, it might look great and protect effectively the objects behind the glass, but if you want the see the objects, or in this case, the beautiful detail of the wood itself, any milkiness might be undesirable since it doesn't add anything except opacity. The varnish goal, as I see it, besides offering protection, is to enhance the natural aesthetics of the wood. Most, if not all coloring agents, turn the varnish opaque to some degree, and the challenge is to keep it as transparent and possible, and as blended as possible with the wood as if it was naturally part of it. I've seen a few excellent examples of this but the best way is by holding the instrument in various positions in daylight and pay close attention the refraction and reflection and how they combine to enhance the texture of the wood.... It's like any gemstone, there are colored but still transparent, and colored but not so transparent...
  11. I assume the Viola isn't yours (Just kidding) Congratulations! (Now I'm not kidding)
  12. My guess was German(ish) because I have one here that looks quite similar... But has "made in Germany" on the label The pictures don't help that much indeed...
  13. No expert, and the skewed photos don't help too, but looks German(ish) 19xx. Check the topic on how to take pictures of the instrument and post them here. Also, check for corner blocks on up and lower bouts.
  14. Hi Maestro! Greetings from Portugal. Me and my wife are already missing Cremona, you Maestro, and your exquisite and beautiful works of art. That deep crystalline ruby color of your violin is still engraved on my brain... They are on to a really long and difficult journey. Putting up a library like those is really difficult, and capturing the essence of a particular instrument even harder... Let's wait and see what they come up with. Nevertheless, great marketing!
  15. And if they pull off a library like this one I'll be amazed:
  16. It looks like they are attempting to create a sampled library like the ones used for composing soundtracks. That's a really difficult task... For those who don't know what I'm talking about, here is one of my favourite : https://www.spitfireaudio.com/shop/a-z/hans-zimmer-strings/
  17. It is... And wine is even better!!!
  18. Some automotive designs are really good from the drivers perspective, but really bad, and even dangerous, from everyone else perspective. Reminds me of early on when LED downlight fixtures had a really small and powerful point source. Now the market is more focused on larger diffuse sources because of the exact same mistakes the automotive industry is doing. They will eventually learn from the past. Hopefully.
  19. Compact fluorescent have the same response as linear fluorescent. Heavy ac light output, or flicker. They are basically the same with the major difference being the included hf driver/starter, on the compact models. Nevertheless, large amount of ripple, just on a higher frequency.
  20. Replacement fluorescent LED are usually focussed on energy efficiency, so tend to have smaller, or no storage capacitor at all by using some form of direct LED array switching technique, so tend to have more ac component on the light output but better energy efficiency. Domestic bulbs are more focused on quality and on/off endurance since they're mainly replacing incandescent, so usually lower energy efficiency but better performance. The automotive industry has a different approach, cost and reliability are everything! The Pulse Width Modulation is the most reliable and inexpensive method to dim LEDs, so....
  21. In sum, the IKEA RYET LED bulb is similar if not better than incandescent lamps in terms of ripple light output. The best ones I've tested in terms of ac component are EGLO and OSRAM non dimmable from 3W to 12W. <2% ripple. Avoid the frosted glass or exposed LED filament decorative lamps because the driver has to be so small in order to fit inside the lamp socket. Small space usually leads to no capacitor, so high ripple on light output. The ones with 3 part construction, socket+opaque plastic section+light diffuser tend to be better in terms of ripple light because they have enough space for a proper driver. At your disposal Sir Burgess!
  22. The one I've tested from IKEA, "RYET" LED 400lm 5W 2700K as a very low flicker <5%. But that's the only one I've tested. I assume the other models should have the same standard, but you never realy know until you measure them... All the dimmable versions I've tested have huge flicker .100%, or "ac" light, to 30%, best case scenario, depending on model and dimmer position. Linear Fluorescent LED replacements usually on the 25% to 75% flicker. On another note, I couldn't live with myself knowing that my magnifier LED desk lamp had such a crappy performance, so a few minutes and capacitors latter here is the new light output: Not as good as a standard LED bulb, but a drastic reduction in flicker... Now the lowest light emission point is at 50% total....