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jammy

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Posts posted by jammy

  1. i have a straight scraper, i didnt think of that. My scraper however has never been sharpened, it came from stew mac do those things come sharpened at all? I didnt think to buy a sharpener at the time (dumb me).

    Sharpening is easy - flatten one edge of the scraper on an abrasvie stone (wether it be water or oil) and lap the sides. The idea is to get one perfectly flat, 90 degrees straight edge.

    You then need a burnisher (a file with it's teeth ground off will do, anything made of hard steel with smoooth edges).

    With the scraper held in a vice with the level edge up, you apply a firm pressure and draw the burnisher along the edge with it tipped to about 10 degrees off perpendicular to the face of the scraper. The idea is to "roll" the corner of the scraper over slightly to provide a cutting edge.

    It takes me about 30 seconds to re-edge a scraper, and it makes ALL the difference.

  2. That's exactly is Mattia, The curve on that brace brings the soundboard to just the right place to take the fingerboard without any humps or dips :D It's the way of determining that curve that's difficult....

    First the neck block is planed to the correct angle:

    The top is dropped into place and pushed down so it's sitting on the block (as It will be when glued up)

    A straight edge is placed on the soundboard at the neck block end...The striaghtedge will be slightly off the soundboard where the bridge will eventually sit. The block is planed untill the gap between the straightedge and soundboard at the bridge position is about 1.5-2mm. We then know the block angle is correct.

    the straightedge is left in the position, with the soundboard held down. A piece of MDF with a notch cut in it (to bridge the straight edge) is then placed over at the position of the top transverse brace. The soundboard is then pushed flat using this piece of MDF and a gap appears under the straightedge at this point - this gap is measured and then provides the curve for the brace.

    In my particular case it was 1mm.

    Well, the picture's a load of shite but here's the first shot of the body...

    10.jpg

    As you may notice I've done the first pass of routing (that's for the purfling), and I'll be doing the binding routes tomorrow. It *should* be all bound by the end of tomorrow :D

  3. Right - a couple of answers first...

    Yup, the top's radiused; 3mm curvature on the x braces and tone bars.

    As for leaving off the main top brace the reasonig behind it is to ensure that that area of the soundboard ends up at the right height and angle, allowing a smooth, seamless transition between it and the neck - it's a compicated procedure to get the curvature, and I'm having a hard time putting it into words - but I'll get back to you on that one. The reason it's left untill just before the top's in place is that the bracing must be notched into the sides to allow some of the required measurments to be taken

    Either way, the top's on!

    Heres a couple of shots of the shaped up bracing...

    7.jpg

    http://www.solar.myby.co.uk/misc/andy/acoustic/8.jpg

    And everything glued into place :D

    http://www.solar.myby.co.uk/misc/andy/acoustic/9.jpg

  4. I will indeed be doccumenting it, yeah.

    I'm still a little unsure on it too, but as i learn about it I'll pass it on :D

    Those acoustic's you've made are beautiful, alot more like what I would like to do if I were left to my own devices, but with learning this stuff in a course I've got to stick to what I'm told to do really :D

    Reverse cut kerfed linings look ace, I think I may be doing those on my next instrument!

  5. The upper transverse brace goes in just before fitting, as it's curvature is pretty critical and measurments need to be taken off the top to ensure it's right.

    As for the block of manogany with "wings", it's main purpose is to add mass under the fretboard extension, meaning that if you were ever to play that high up over the soundboard the notes wouldn't sound shite.

    The wings just add a little more support to that pretty in-active bit of soundboard.

  6. Certainly an amazing guitar hyunsu! I'll start using posher woods like that when I can be sure that I'm not going to mess things up :D

    Bending the sides of a £300 set of brazillian rosewood must be a scary process!

    Cheers for the kind words guys.

    A minor update - the top's jointed and thicknessed, and I've routed out for the soundhole purfling. On to bracing next week :D

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