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  • paulmcevoy75paulmcevoy75 Portland, MaineNew
    Posts: 409

    you can use all your big 'sciencey' words but it's still magic to me.

    BillDaCostaWilliamsbillyshakes
  • billyshakesbillyshakes NoVA✭✭✭ Park Avance - Dupont Nomade - Dupont DM-50E
    Posts: 1,576

    I just wanted to write a coherent post to be the 100th comment on your thread. Job done. ;-)~

    Bucopaulmcevoy75BillDaCostaWilliams
  • paulmcevoy75paulmcevoy75 Portland, MaineNew
    edited April 16 Posts: 409

    Still working over here. I'm vacuum bagging my structured sides. This is the first set I've ever done. It's been a lot of goofing around trying to figure out how to do it. It wasn't as easy as I expected. At one point it stressed me out so much I laid on the floor and took a nap. But then I figured it out.

    The goal is to get a nice even clamping pressure so the sides are nice and smooth and the glue spreads evenly everywhere, creating a nice composite that's as light as possible. This is a picture of one of the sides just out of the mold. And the cutaway side in the bag.


    JSantaBuco
  • paulmcevoy75paulmcevoy75 Portland, MaineNew
    edited April 16 Posts: 409

    Here's a short about using 3d prints to miter the feet on the bridge braces:


    Buco
  • flacoflaco Shelley Park #151, AJL Quiet and Portable
    Posts: 169

    Fascinating!

  • edited April 17 Posts: 5,322

    We didn't get to see the joint on the camera.

    At one point it stressed me out so much I laid on the floor and took a nap. But then I figured it out.

    That's the period of gestation that I read about. Apparently, Steve Jobs used that all the time. Whenever he'd be stomped with the problem, he'd go for a walk without thinking about the problem. Then usually, the solution would present itself upon returning to it.

    PS I love razor saws


    Every note wants to go somewhere-Kurt Rosenwinkel
  • paulmcevoy75paulmcevoy75 Portland, MaineNew
    Posts: 409

    I'm pretty into naps. I do what I call a floor nap in the shop where I sweep the floor and then just lay down on my back. I can fall asleep in like 2 minutes. But I'm a pretty sleepy person generally. Also I work way too late.

    I have another set of braces to notch and I want to redo my jig so I'll make a better video, that one kinda blew.

    I don't have much saved for retirement but I own maybe 7 Japanese saws so....

    BucoJangle_Jamie
  • paulmcevoy75paulmcevoy75 Portland, MaineNew
    edited April 18 Posts: 409

    You can't really see it but I put all these braces on with carbon fiber underneath. I'll preliminarily shape the braces and then glue the sides on...after that I can check my deflection on the top and take the braces slightly below where I want them, then they will get carbon fiber on top which will make a little I beam. The idea being a brace that is less mass than the equivalent Sitka but the same stiffness.

    I've experimented with this on several of my last guitars and they all sounded good/great but I have a really good idea what I'm shooting for this time and how I'm going to measure it. We will see.

    I have one guitar in this batch that will be wood only braces so I can compare. I don't think there will be a huge sound difference but the CF should help make a more durable guitar with less chance of the top sagging over time.

    billyshakesBuco
  • billyshakesbillyshakes NoVA✭✭✭ Park Avance - Dupont Nomade - Dupont DM-50E
    Posts: 1,576

    Does this image signal the end of the vacuum experiment?

  • paulmcevoy75paulmcevoy75 Portland, MaineNew
    Posts: 409

    Not sure tbh. It's not the panacea I was hoping for. Mostly because to do something with epoxy would mean I'd have to run the pump for 6 or more hours. I have limited electricity in my shop so it means I can't do other stuff that draws a lot and I don't want to leave it running overnight.

    So far it's good for doing sides.

    I also just bought new go bars, which are 1/4" instead of 5/16" and they are like half the pressure of my old ones. The old ones were too strong and sometimes would crush wood fibers.

    But I like the vacuum pump idea. I will def use it on classical guitars with lattice tops and I'm using it on my sides.

    billyshakes
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