R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 4, 2016 20:18:44 GMT
When I said yesterday that I had "finished the back" you no doubt gasped and started screaming at the screen, "but what about the braces?". And you were right. Today I made some braces and attached them having first cut precise channels through the cross-grained reinforcing strips to accommodate them. The big question about bracing the back is whether to ladder-brace or cross-brace. I've gone for ladder-bracing again because it's simpler - and I'm in a hurry - but also because I wonder how much difference it makes when, as has often been observed, even a "live" back goes pretty dead once it's jammed against a big belly. I admit, however, that aesthetically the cross-bracing does have the edge and it makes it easier to fit your label underneath the hole so that everyone can see it. Indeed, the spacing of my ladder-bracing is based around the amount of room I need to fit a label rather than any subtle mathematical calculations. I am, however, going to retain my rather bizarre idea of having each brace present a flat surface towards the soundhole as it might be reflecting sound in that direction. Fundamentally, I am making a substantial back which is designed to simply reflect any vibrations from the soundboard or from within the box out towards the listener. Here's a go-bar deck picture to give you an idea of the amount of arching across the back: Those braces are made of Douglas Fir aka Oregon Pine aka Columbia Pine aka old door and they are cut from the tree trunk vertically and with their height pointing in towards the centre of the trunk. i.e. They are quarter-sawn. Now Mr Somogyi* has done experiments which show that this does not make them any stiffer than pieces cut randomly but it does give me the opportunity to show off both in terms of my knowledge and in terms of my (limited) woodworking skills. But hey! - enough iconoclasm for one night! Back to backs. These pictures show how it looked when it landed back on the trestle-table upon which I work: So far unshaped and the ends will need to be trimmed to fit into notches in the sides (if I must!) but that will wait for tomorrow. Then it will be a matter of finalising the rest of the insides before gluing the back on and moving on the final stages. I'd better get that fret-wire ordered. *A man who seems to know an awful lot about building expensive guitars and writes books about the process.
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 5, 2016 20:11:06 GMT
I carved the braces to some kind of shape - pointed at the soundhole, theoretically, which took a little while. Then I sanded the inside of the back down through the grades as far as 240 grit. That took a while, too. Then I trimmed the back down very close to its final size and marked out where to cut the notches in the sides to accommodate the ends of the back-braces. Doesn't sound like a great deal of progress but it all has to be done. Here are some pictures: And with some glueless cramps to check that it all fits - I still have to finalise a few things inside the top before I can stick it all together: Will I get to glue it together tomorrow? Tune in to find out.
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 5, 2016 20:33:52 GMT
ps I had forgotten that I spent most of my time today sanding the back edge of the sides down to the right profile to receive the back using my sanding trough. This was hot work and dusty work and hard work but I made it. Thought you ought to know.
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 5, 2016 21:00:25 GMT
Ooops - pay no attention if you wondered what that was.
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 7, 2016 20:50:51 GMT
I don't have such a good memory these days but judging by the photos yesterday seems to have been spent finalising a few things inside the box before closing it up. This would have involved, amongst other things, paring down the braces a lilttle more, although this time I doubt that I've gone far enough; I predict this one will be over-built again. Never mind. Also I made some little oak back-stops to prevent the floating buttresses from leaping out of their little housings in the waist. Here's one of them: It doesn't look much but it'll stop the guitar folding in half, I hope. Here they are being glued in place at the ends of the buttresses: I know you can't see anything but you'll have to take my word for it - oh, hold on... I've got a picture of them glued in place and, by this time, all sealed in with shellac, too: Now do you believe me? In fact, I slopped shellac over the whole of the inside (including the bit by the tail block which should have been left bare for the glue to take hold): Luckily, I noticed this later just as I was gluing it up and just in time to grab some coarse paper and rub it away just enough for the glue to get through. Next, of course, I took a deep breath and spread the glue: This, however, didn't happen till this morning; foolish folk who don't know my priorities at the moment have started bringing pieces of furniture and they have been something of a distraction. Nonetheless, I managed to get the whole thing glued up this morning. Here's a drone-view: The string, incidentally, just stops the braces from slipping out of position. (Of course, half way through the process, when time is rather important, I discover a bloody great ravel in the middle of the string and spend precious minutes unravelling it as the glue goes off in the oppressive heat but I don't need to burden you with that except to say that I was already hot and sweaty and it didn't help...) Later today I ended up with something rather guitar-like. Here are two traditional views: the full back and the three-quarter back (not to mention the scrum half): Time is short, I am well aware, so I will stop writing and go to bed soon so that I am fresh and frisky in the morning.
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 8, 2016 20:55:46 GMT
Admittedly I also fitted in the oiling of a small table-top and the first stages of polishing a slightly bigger one, but most of this morning was spent wrestling with bindings and rope. Mr Somogyi* advocates the use of cotton rope wrapped very tightly round and round the body in a particular sequence - the guitar body, that is - as a foolproof way of attaching recalcitrant bindings. Now I had cut my maple bindings a bit thick and had had awful trouble bending-without-breaking them on my bending-iron but they were rather over-sized and very hard to persuade into their proper place. I decided to adopt the Somogyi method. I'm sure it works but I went through 2 or 3 dry-runs and every time the rope slipped off at one stage or another and all the tension was lost. I had a quick lunch and decided to cut my losses. I cut some new strips of maple and ran them through my sander-thinnesser to something very close to their final size this time before bending them to shape - quicky and efficiently and even quite accurately. I then used my tried and tested method of hot-hide glue and strong fingers followed by a little tape... and with considerable success. I'll pop the back ones in first thing tomorrow but then I've got to zoom off to Addenbrookes so that they can tell me my heart is fine again. (Actually, they've promised me a recorder which will show what my heart is doing all day - beating, I hope - so that could be quite exciting.) Meanwhile, here are a couple of pictures: Damn! I should have shellacked the edges of the soundboard before slopping glue all over it! * A world-renowned builder of expensive acoustic guitar and writer on the subject of expensive guitar building.
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 9, 2016 20:59:51 GMT
After a lot of scraping and sanding I got through the glue and back to the soundboard; well, I reckon it needed a bit of thinning round the edges to loosen it up: Some might say, understated, restrained, tasteful; others might say, drab, boring, bland. I just say that binding doesn't quite meet up properly at the bottom, does it? How the hell did I manage that? Here's the back: That's none too flashy either. I've also done some budget fret-markers which consist of diagonal saw-cuts into the edge of the fretboard widened with a little file and then filled with a bit of maple. I haven't trimmed them yet but it's another job almost done. I fear this guitar will not end up rivalling a Somogyi nor yet a Benedetto; more of the monk's cell than the tart's boudoir methinks. So what's left now? Well, an awful lot of finishing off to begin with. It's a bit like a lump of marble roughed out but awaiting the final carving of fine detail at the moment and that can take a long time to do. I'll also have to finish it - maybe oil this time but nothing too fancy just something to keep the wood clean. Then there's the metalwork: the frets and the machine heads. But that's about it... Oh, yes, strings.
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 11, 2016 21:49:14 GMT
Yesterday was one of those days where you seem to do quite a lot of work and then go to bed with the feeling that you have lost ground. Two major things were worrying me as I lost consciousness: first, I had tried to scrape and sand the bindings flush with the sides only to find that they were dangerously thin in one or two places and would, ideally, need to be removed and the channels re-routed; second, I had just had trouble with one of the machine-heads which tightened up as I turned it and then seemed to stop working altogether. To take a step back in order to explain the latter more clearly; I like to get the strings on at this point (especially after the last beefy guitar which still needs to have the fretboard sorted out before it will play) so that I can be fairly sure the action is somewhere about the right area before I actually install the frets. In order to put the strings on, you first need to put some kind of saddle in place and also install the machine-heads so that you can tighten then strings. I made up the wooden parts of the three-part saddle - what I call the "sub-saddle" because it is topped by bits of fret wire in its final form - and adjusted their height and curve to match the fretboard. At the other end I realised I really ought to get some polish on the headstock before putting the machine heads on because you don't want to keep installing and uninstalling the bushes through which the string-pegs slide because they are quite a tight fit. (Last time I believe I took some veneer off when removing one). Of course, before you polish something, you need to sand it to its final shape and smoothness. You will have noticed that I spend a lot of time stepping back and back and back in order to achieve a fairly simple final aim. After all this, it looked like this: Looks nice but I know that there's a bad join in the surface plate of laburnum just up near the top that will need filling at some point in the finishing process and I also know that the bottom right-hand machine head (i.e. the one for top E) needs to be removed and to have its holes re-aligned. With all that on my mind you can probably imagine the sort of nightmares I had but I won't burden you those horrors. Today was a new day and things always look better in the morning. Went for a run with some village people (not Village People) at eight and got into the workshop around 9.30 and spent much of the day in there. I sorted out the rogue machine-head and moved on to sorting out the neck and fretboard. I had another carve at the heel and finalised the edge of the fingerboard as far as I could before actually installing the frets. I re-sawed all the fret slots to make sure there was enough depth there to take the tang of the frets - about 1.5mm and cut all the frets the right length from my roll of fret-wire. I didn't actually hammer in any frets at this stage because I hadn't yet checked the geometry of the strings/neck/bridge. Once it was strung up I plucked a few strings to reassure myself that it sounded like a guitar and then measured the action at the twelfth fret: Looks like about 2.3 mms, which is well into the right area. (Notice, by the way, that any frets inserted at this stage have had their barbs removed so that they can be inserted and removed easily but which, for the same reason, don't actually sit flush with the fretboard). Here's a picture of the whole thing: By the way, have you noticed my orifice? I'm rather proud of it. It's the first time I have installed a truss-rod in a flat-top with access at the head end because I don't like fiddling around with little screws and covers so I have adopted the ajlucas hole in the head. I think it's rather nice if a little orificial. This evening I managed to insert three frets before I was called upon to light a barbecue, cook some food on it and then wash everything up. I'll have to get back to it tomorrow. Oh, by the way, I've decided not to lose sleep over the skinny bindings; I'll leave them as they are for the time being and come back to them after I've polished the guitar if necessary. I haven't really got time to fiddle with them at the moment.
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ocarolan
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Post by ocarolan on Sept 11, 2016 22:00:40 GMT
...................................... By the way, have you noticed my orifice? I'm rather proud of it. It's the first time I have installed a truss-rod in a flat-top with access at the head end because I don't like fiddling around with little screws and covers so I have adopted the ajlucas hole in the head. I think it's rather nice if a little orificial. ................................................... Looks like you spent a very worthwhile day at the orifice, Rob.... Keith
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leoroberts
C.O.G.
Posts: 26,145
My main instrument is: probably needing new strings
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Post by leoroberts on Sept 12, 2016 7:57:04 GMT
well, it certainly looks guitary A day well spent, I'd spent.
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 12, 2016 21:16:22 GMT
Got the frets in. Sorted out their ends, levelled them off, profiled and dressed them, polished them up and popped some oil on the fretboard to protect it from my later activities. While it was hardening off, I switched to working on so-called Beefy Bryn - but more of that elsewhere. Here are some pictures and, by the way leoroberts , the sleeper wood (whatever it may be) is indeed quite attractive:
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leoroberts
C.O.G.
Posts: 26,145
My main instrument is: probably needing new strings
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Post by leoroberts on Sept 13, 2016 7:37:58 GMT
Yup - it's come up a treat!
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 15, 2016 17:24:44 GMT
Yesterday would not have made very exciting viewing but I was, be assured, hard at work. I strung up both guitars - I'm including Beefy Bryn here - and adjusted truss rods where necessary and got them playing, though I imagine they might make useful fodder for the team of luthiers at Halifax to chew on. My first impression is that Beefy Bryn sounds better than this current one mainly because this one was a reaction to the distortion of Beefy's soundboard and is, as a consequence, probably somewhat overbuild. At least it should survive the trip to Halifax while Beefy might not. I exaggerate; Beefy is under considerably less strain now that the saddle has been lowered to somewhere around the 12.3mm that I aim for. Yesterday, being aware of this over-building, I made a last ditch attempt to thin the soundboard towards the edges whilst leaving it fairly thick down the middle, which was always the plan with this guitar. Having spent a lot of time and energy on this, I decided enough was enough and that I could always return to the task at a later date since French polish is pretty easy to sand through and join up at the edges. At an early stage I realised that I might lose my fingerprints and start dropping plates and cups so took preemptive and protective steps with the tried and tested masking-tape method. Here is my sanding hand having a rest: I now descended through the grades of paper from 80 to 100 to 180 to 240 and even a quick whisk of 320 and ended up with this: It looked rather nice - but don't be fooled; lurking there on the thicker bits of Douglas Fir towards the spine of the board are remnants of whatever had soaked through to this depth from the original door surface, this being doorwood remember. I did bleach it earlier but by now I am past caring and am prepared to see nasty stains as "characterful". Today I turned to polishing. Since the polishing on Beefy Bryn was never actually completed - I knew I needed to do more work on it and "more work" usually entails careless treatment of the finish - I thought I would deal with the two guitars in tandem and have a polishing fest, though of course there was less work to do on the older guitar since it already had a finish of sorts on it. I removed all the metalwork from both guitars and set about them with Jenkins SPB. Here is the scene at the end of the day: Yes, indeed. Some nasty old stains there - but characterful (in the same way that a greasy tea-towel is characterful). I might do something about it at a later date. Apart from that I thought it was interesting to see how dark the soundboard has gone on the Beefy Bryn in the two short months since its production; perhaps the same thing will help mask the stains on the new one. Also notice how different the two lots of sapele are. The newer lot is pretty dramatic so I had a quick look to see how much more of this batch I had and here's the answer:
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 19, 2016 20:44:29 GMT
Right. I finished polishing the Beefy Bryn at the end of last week and put the strings back on it and it plays. Not only does it play but it plays very nicely. I then looked at the new one - the one that this thread is concerned with. Mrs RtheF and I looked at it and she agreed that it looked like a greasy tea-towel. She didn't think that was a good look. Not only is it plain but it is also greasy-looking. If you put that together with the fact that I suspect it is not very "responsive" - i.e. it doesn't sound dramatically good - there is obviously only one way to turn. I took a decision to hit it with scrapers and heavyweight sandpaper. I probably took about a millimetre off it in places with 80 grit paper and then took it down through the grades until its texture was reminiscent of human skin. It now steps up quite dramatically to the central spine and, with luck, that will help it sing a little; it has certainly improved its looks. Here is the process in photos; here's how it stood last time you saw it: Here's how it looked after a concerted effort with the old 80 grit (and a lot of hoovering): And then simply add polish: Yes! It suddenly looks like a freshly laundered tea-towel; let's hope it doesn't sound like one. An enforced day off in London - the boy was performing in the Albert Hall (he dropped in nonchalantly...) - and then back to finishing off the polishing this morning. Tomorrow I hope to finish the polishing and get the strings back on and see what it sounds like without the grease. Mrs RtheF also wondered why I hadn't taken the sleeper-wood strip right down to the tail - or "butt" as the Americans would have it... quaint. I think I see what she means. It's not as if I didn't have enough sleeper.
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R the F
Luthier / Guitar Maker
Posts: 1,135
My main instrument is: bandsaw
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Post by R the F on Sept 20, 2016 20:06:17 GMT
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