Almost done with the Wood Work parts on the 16-1/2″ five-string Viola!
Completing Arching of the back plate.
When I last posted, I was nearly done arching the back plate, and nearly done shaping the neck:
Setting the neck
I forgot to take photos during this process: sorry. I get wrapped up in the work and forget all about taking photos.
Setting a neck follows this course of action:
Prepare the neck heel– angles and dimensions all correct. Heel absolutely flat, all mating surfaces absolutely smooth.
Lay out and cut out the mortise in the neck block on the corpus. I try to give myself some room for adjustment. It is always a mistake to try to cut exactly to the layout lines in the first attempt.
Check all measurements with every single change:
how does the centerline of the neck fit, relative to the centerline of the corpus?
how does the transverse level of the neck match the level of the corpus?
how does the pitch (front-to-back) angle compare to what is correct?
how does the distance between the nut line and the top edge of the front plate compare with the correct distance?
how does the height of the lower edge of the fingerboard above the edge of the front plate match the correct height?
When the final fit is perfect, checking ALL measurements, remove the neck and slather in the hot hide glue, and immediately ram the neck into place one last time, making a fast re-check of all measurements, to make sure nothing moved out of place.
Let it dry!
You will notice that I set my neck before closing the corpus. I find it easier and faster, and it allows me to achieve a perfect fit against the back button.
Graduating the Back Plate
The next step was to carve out the interior of the back plate, to achieve ideal thicknesses all over. This is called “Graduating the plate” or, simply “Graduation.”
After I established the current thicknesses for all the above locations, I carved each dot to the thickness I actually desired, leaving a series of pits all over. The following photo was actually of the front plate, but it is the same idea:
After connecting the dots, the graduation is very nearly complete. I scraped, and checked thicknesses, and scraped some more, until it looked like this:
Preparing to close the Corpus
With the back plate graduation complete, I was ready to attach the plate to the corpus, except that:
the corpus was still attached to the mold, and
the blocks and linings had yet to be shaped.
So I sketched in the planned shapes of the six blocks, trimmed the neck-heel flush, removed the mold, and then set about shaping the inside of the blocks and linings.
I used a knife and a chisel and a gouge to shape all of them, finishing with a scraper. The very first step was to sketch in the block shapes.
Then I cut the neck-heel off, flush with the neck block. I used a flush-cut saw for this step. It works well, but you have to watch carefully to make sure it is not wandering off the line.
Removing the Mold
Then I leveled the back of the garland, using a sanding board, and I was pretty much ready to remove the mold. I popped the glue-lines loose from where the blocks were attached to the mold and lifted the mold out. It is a collapsible mold, so I removed the bolts and took the mold out in three pieces. That left me with a completed corpus, and a neck already set, but no mold. At this point the structure is extremely fragile: I have to be verycareful until the back plate is glued on, making the structure rigid and strong again.
The next photo is from an earlier instrument, because I forgot to take a picture of the shaped blocks in this instrument:
Closing the Corpus
Then I installed the label, and dry-clamped the back plate to the corpus, using spool-clamps, checking carefully to see that my position was correct, and that the overhang was equal all the way around.
I then removed a few clamps at a time, and slipped hot hide glue into the joint, using a thin palette knife, and quickly replaced the clamps. When I had spool-clamps all around the perimeter, I added one last clamp, a padded C-clamp, to ensure that the joint between the neck heel and the back button was fully closed and tight. I used a glove to pad the neck, and clamped it securely.
The next thing will be to trim the neck heel and back button together, as they are the key to the strength of the joint, and must hereafter function as one.
But I will leave those steps for a later post…this one is already too long. (sorry…)
I would love to just say, “There! All Done!” but the fact is, I will always be able to see little things I wish I could change, and perhaps could not see until it was pretty much too late. That’s OK…it’s part of being a maker. I just have to know when it is time to say, “That’s as far as I am going!” and call it good.
Last time, I shared how one of those decisions was how dark to make the varnish. I came to that decision about two coats past the last time I posted, so I allowed the varnish to harden for about a week, and then gave it a final once-over, and began the set-up procedures. Here is how it looked before I began set-up:
The varnish took several days to harden enough to work on set-up, and even when I thought it was ready, it still easily took fingerprints. 🙁 I guess I should have known. Anyhow, it means there will be some rubbing out to be done after set-up is complete, and the varnish is even harder.
I did not take many photos during set-up. Set-up includes:
Re-installing the Fingerboard,
Installing the nut,
Installing the saddle,
Fitting the soundpost,
Fitting the bridge,
Installing the end-button,
Installing and adjusting the tailpiece and strings,
Installing the chinrest, and
Playing while adjusting for sound (balance, tone, etc.)
So, I had a fairly frustrating day, wherein it seemed nothing went right on the first try. It took me twice as long as it should have, but I got it done. I only took a few photos:
The 5-string 15″ viola had good sound from the first moment, but, as usual, it required some sound-post adjustment to achieve balance across all five strings. A sharp-eyed viewer also may notice all the mismatched strings; Jargar C, heavy Dominant G, D and A, and a regular Dominant E. I was unable to find the string sets I had bought recently (found them later), so, for the moment I simply used what I had, and adjusted accordingly. And, surprisingly, it sounded quite good.
It has a huge voice compared to my violin-size five-string fiddles, and except for the C, thebalance is very good. I adjusted the soundpost to bring the C-string into line, and it is much better, now. I am anxious to try an actual “set” of strings on it, to see what I can achieve in terms of balance and over-all tone.
Anyway, here is what it looked like immediately after full set-up:
It still will need a final rub-down, but for now, I am playing it and just letting it finish hardening.
This is the first large 5-string viola I have made. So far, most players have been quite firm about wanting the same scale length as a violin…and an instrument that will fit in their fiddle case. So that is what I have mostly made. But lately, there seems to have been an increased interest in five-string violas. Some were interested specifically in a smaller viola (hence the current, nearly completed 5-string 15″ Viola,) but more recently, there were two players who were really interested in a large 5-string viola. A 16-1/2″ Viola with a high E string.
So… here we go! I already had European Maple and Spruce billets set aside from earlier “shopping trips,” and everything else that I needed to build a big viola. All I had to do was to finish the instruments already on the bench! They are now out of the way, except for completing the varnish and final set-up of the 15″ 5-string viola… so I am good to go. Here are most of the materials, with the plates already bookmatched.
Making, Bending and Installing Ribs
The blocks were already in the mold, and shaped. It was time to start working on ribs. I thinned the ribs to the proper thickness, using a fixture I made for my oscillating spindle sander (one of my few power-tools.) Then I bent each of them to the proper shape, using a hot bending iron.
When I had all six ribs shaped, I installed the two center-bout (often called “C-bout”) ribs, and secured them with hot hide glue and clamps. You can see that clamping to a curved surface is not easy. I held the mold in a small vise, then secured each joint using hot hide glue, cylindrical wooden cauls, and f-style clamps.
When the glue holding the center-bout ribs was dry, I trimmed the ends of the ribs, using the spindle sander again, and installed the lower bout ribs. The joint at the center of the instrument, between the lower ribs, has to be pretty close to perfect, as it will always be visible and any discrepancies will be glaringly obvious under the varnish.
Finally, I installed the upper ribs. There is no joint between the upper ribs: in fact, they don’t even have to touch. The neck mortise will remove the middle section regardless of how good my joinery is, so I leave a gap there to allow for easy installation of the ribs. (Meaning, I only have to concern myself with how the ribs fit the corner blocks and that they cleanly follow the mold up to the neck block.)
Making, Bending and Installing Linings
While I was bending ribs, and still had the iron hot, I went ahead and cut and bent a supply of linings. The linings, like the blocks, are made of willow, because I like the way it works. The linings serve to triple the gluing surface of the edges of the ribs, where they contact the plates, as well as strengthening the rib garland.
I made a small mortise at the juncture between each rib and each block (24 of them,) and then installed the linings dry, to make certain they fit correctly. Then, one-by-one, I removed each lining, applied hot hide glue to both the rib and the lining, and quickly reinstalled the lining and secured it with a series of small spring-clamps.
Tracing the Shape of the Plates
When the glue holding the linings was dry, I removed the clamps and used the spindle sander to trim the ends of the rib corners. I also leveled the front and back of the garland, so that I would be able to trace the shape of the plates. The European Maple back plate is on the left, and the European Spruce front plate is on the right. I used a small washer as a spacer, to establish the edge overhang, and a ball-point pen to trace the shapes. You can see that I have begun work on the neck, as well, which is also made of European Maple.
The garland is temporarily out of the focus of the work, now, so I hung it up, out of harm’s way, until I am ready to begin installing plates.
The next step is to actually cut out the plates and begin shaping them into the voice of a Viola. I will let that wait until a later post.
When I last posted, I had completed the carving of both plates and the garland, but had not begun assembling the corpus.
The next step was to install the bass bar. The bass bar is the only fixed, interior brace in violins, violas or cellos. Flatback basses do have some other bracing, but they are a different “branch of the family,” so to speak. All members of the violin family have a bass bar– a spruce brace, which runs “north-south” at a slight angle, nearly parallel to the centerline of the front plate of the instrument, and just inboard of the bass-side f-hole, so that it supports the bass-side foot of the bridge. In a five-string instrument, this becomes an even more critical part as the instrument has a broader range and has to have good support on the bass side, as well as the ability to sing in the higher registers.
I first carve the bass bar bottom to exactly fit the inside curve of the front plate, along the correct location, and at the correct angle, then glue and clamp it in place, using hot hide glue and special clamps, padded with cork, so as not to damage the soft spruce of the front plate.
Five-string viola corpus assembly:
Now the plates are ready to be installed. Before doing so, I used a small finger plane and half-round files to shape the edge all the way around on the inner face of each plate, hoping to avoid having to shape it after installation. (I am aware that sometimes adjustments have to be made, so I may have to do some tight-clearance work later on, in spite of this precaution. That’s OK.)
The next step was to install the back plate. This is an older-model mold, or “form,” (my first, in fact, as I mentioned in an earlier post) so it has some peculiarities, compared to my newer ones: it is a two-part mold, made to collapse, thus easing removal of the mold after installing the first plate. But in later iterations, I moved toward installing the front plate first, and installing the neck before removing the mold.
In this model, originally, I had planned to install the back plate, then remove the mold, and finally install the front plate, after which I could install the neck whenever I was ready to do so. Nowadays I personally find it easier, however, to install the neck before the back plate is in place, because I don’t have to concern myself with the back side of the heel aligning with the back plate button. (Annnd, it would have been a simple matter of planning, to still do that with this mold, if I had been thinking ahead: just label the front side of the mold as being the side without the screws (which have to be accessible) and you can install the front plate first, then remove the mold after installing the neck; no problem.) However…I wasn’t thinking ahead, and I used the mold exactly as I had originally designed it, so I have no choice, now: I am forced to install the back plate first, remove the mold and then (after shaping the blocks and linings and cleaning the interior of the corpus) install the front plate. So that is what I did. (By the way, in case you are thinking that the shape of the front and back plates are mirror-image of one another, the fact is, they virtually never are exactly mirrored, and are nearly never bilaterally symmetrical even if they were. So the front plate will not fit the back of the mold, and vice-versa.) Ah, well…hindsight, etc.
Here is the back plate, glued in place: the mold is still inside, holding everything rigid. Notice the spalting and curl in the maple back. This is a striking look, and some people love it…others do not.
After the back plate glue was dry, I removed the mold, shaped the interior blocks and linings, and cleaned up the interior of the corpus, so that it was ready for the front plate to be installed. I also installed the signed and numbered label, marking this as one of my handmade instruments.
Then I clamped the front plate in place, dry, just as I had done with the back plate, removed a few clamps at a time, and used a thin palette-knife to insert hot hide glue between the plate and the blocks and linings. As soon as I had the glue in place, I quickly replaced whatever clamps I had removed, before the glue could gel.
Once the plate was glued and clamped all the way around, I went back around with a blade, and picked out any gelled, cooled hide-glue that had squeezed out of the joint, so as not to have to deal with it later, in the form of hard, jagged chunks of dry hide glue. Then I tightened the clamps a little, and brushed hot water all around the joint, so as to reconstitute any glue that had gelled too soon, and allow the joint to close even more tightly.
Here is the corpus, all glued together. The next step will be to adjust the overhangs as needed, and lay out the corners so as to begin purfling.
Beginning Purfling the Five-string viola:
I used to do my purfling before closing the corpus, but I frequently discovered that the rib garland had moved a little, during the removal of the mold…or in some other way, things had changed, and then my plates no longer fit the garland, and I could not change the plates, because I had already installed the purfling…which locks in the shape of the plates, irrevocably (sigh…). So, I began waiting until after the corpus is closed and whatever needed overhang adjustments have been made, and then begin purfling.
I use a two-blade purfling marker to sketch in the location of the twin, parallel cuts needed to make the purfling slot, but I have to sketch the corners in by hand, with a pencil, because the purfling marker will not correctly lay out the corners.
I went ahead and began both the front and the back plates, but got too tired to complete them last night. (Today was spent getting last-minute things done, as we have heard they are mandating that all Oregonians stay at home, due to the coronavirus scare. Went and bought flour and other groceries, filled the car with gas, and got the snow-tires removed, as that deadline is soon upon us as well.)
One thing about the maple and spruce plates: the spruce is very soft, compared to the maple, but it is tricky to carve, because of that. The winter grains (reeds, they are called) are so much harder than the summer reeds, that the blade has a definite tendency to swerve and follow the grain instead of the line you are trying to follow. The maple is much tougher to cut, because it is hard all over, but it is much easier to follow your lines without digressing.
So, here is what the little viola looks like, today:
In both cases, the plan is to cut the two incisions, pick out the wood between them, and then dry-fit the purfling strips, before removing them one-by-one and gluing them in place with hot hide glue.
That will be the next post, unless I take a break and carve the scroll. Either way, it is starting to look like a fiddle!
I began this instrument as an experiment, in 2010, but did not complete it. In fact, the only reason I know when I began it is that I wrote the date on the mold when I made it. It was intended to be a 14″ Viola with a very wide lower bout.
The wood for the neck, sides and the one-piece back is plain-sawn, Big-leaf maple with a two-piece Sitka spruce top plate. The workmanship is not as good as I try to produce today, so I might have simply discarded it, but, (I reasoned with myself) “it is just an experiment, to see what happens if you add a lot of width in the lower bouts.” If it turns out to work well, I will still have the mold and can simply make better, more professional examples of the same model.
What about a five-string Experiment?
So, back in September of 2019, it occurred to me that really I needed more 5-string fiddles on my website (especially violas), and that, if it worked, this was one I could complete more quickly…so I jumped back on it!
It still needs a good rubdown, a soundpost adjustment, and some play-in time, but today it is playing, and it sounds and looks OK, for what it is.
The voice is still a little too soft for what I want, but that could be the fact that the varnish is still pretty soft, too; and also, the soundpost is pretty tight (which I know will need to change, but I also recognize that there is a tendency for the arching to relax a little and for the soundpost to be looser, after some time with strings on. Longitudinal compression of the top plate tends to try to shorten the top, resulting in a change in how the soundpost fits.)
All that to say, I am reticent to just jump in and trim the post, when it may actually need the extra length, in a few weeks, and with the varnish hardening off, and the playing-in beginning to take hold, I want to take my time about making changes.
The sound is (mostly) balanced across all five strings, but the C-string could use a little more focus. Probably adjusting the soundpost and giving the varnish more time to harden will take care of all those issues.
Finally, because the repetitive tensioning and relaxing of the tuning is hard on strings, I have deliberately used an older set of strings for the set-up and trial period, so as not to sacrifice a brand-new set in what I know will shorten the life of the strings.
So! There it hangs in the dining room, where it will be warm, and we will see what the next week or so brings.
There are folks who want a five-string fiddle, and who can’t justify the expense of a hand-made instrument, made by an American luthier. I completely understand that, so I am going to try an experiment of sorts: I bought two instruments in the white …unvarnished, incomplete, etc. One is a five-string violin (standard size), with a one-piece back, and the other is a 15″ 5-string viola.
The viola looks much larger than the violin in this photo, but, in reality, the body is 1-1/16″ longer than that of the violin, with a proportionately larger neck and scroll.
I can see some potential problems, and I will see whether I can correct them before completing the instruments. There are certain details necessary to a good instrument that have been overlooked in these two. Specifically, it is needful to arrange the locations of the pegs in such a way that the higher strings do not rub on the pegs that are lower in the box. Both of these instruments fail that test pretty badly, but other than that, they seem to be very well-made, if possibly a little heavy.
Up until now, I have only bought standard, four-string instruments-in-the-white, and they have all turned out quite well. I hope I can make these two turn out to be great instruments, too, but… as I said, this is an experiment, of sorts.
At any rate, I will go over them carefully to try and bring them up to my standards as far as those things go. The workmanship is very good, though: I hope they sound great. I guess we will have to wait and see.
Shop Instruments, as a Principle
The advantage of using an imported, unfinished instrument like this, is that it drastically reduces my labor investment, and I can pass the savings on to customers who want a good instrument, but may not want to spend so much.
I label my shop instruments as “Atelier Chez les Eveques“, (the Shop at the Bishops’ Place.) Unlike my handmade personal instruments, they are not signed or numbered. But they are good instruments, and all who have bought them have been well-satisfied.
I will show progress on these two instruments as time permits. (We have had a host of home-repairs to worry us, lately….)
The last time I presented anything about these instruments, I think it was on another site, so– here is how they looked at that time (earlier this week, perhaps.)
Blocks installed, and necks cut out.
In the above photo, all you can see is three violin forms, with blocks installed, and some of the wood that will go into each, including the necks. I already had a fourth instrument (a small viola) begun, which was not in the picture.
So, here is that 14″ 5-string viola, well on the way to completion, but still with a long way to go…as of today.
And, as promised, here is a progress report on the other three:
On this instrument, the ribs are installed, but no linings as yet, and, while the Maple and Spruce have been selected for the front and back plates, they are essentially untouched. The neck has been traced out and the outline cut, but it, too, has far to go.
For this instrument, a five-string fiddle being built on the form of the 1735 “Plowden” Guarneri del Gesu, I had a top plate left from a previous project on the same form, so I opted to use it, with the spalted Big Leaf Maple back and ribs. No linings, yet, but they have been bent and are ready to install. The neck is from a different Big Leaf Maple, which came from the yard of the property where my wife grew up.
Henry (Senior) would not have recognized this form, but it was loosely derived from the form in Henry Strobel’s book, “Violin-making, Step-by-Step”…so it is called “Strobelesque.” In this photo, the glue was not dry on the treble-side upper rib, but I didn’t want to wait, so I took the photo with the clamps still in place. Again, no linings, yet, but they are bent and ready to install. Here, too, I had a partially completed top plate, and elected to use it. The back and sides are heavily spalted Big Leaf Maple, and the neck is also Big Leaf Maple, though from a different tree…the one in my Father-in-Law’s yard. A few years ago, they decided that tree had enough rot to be dangerous, so they took it out, but it provided wood for a number of instruments.
My son Brian Bishop builds high-quality guitars, and managed to salvage several guitar sets beside the various violin and viola sets I saved. I got one cello set out of it, too…it will become a cello for my beloved wife.
Violins have been codified in terms of form, size, materials and tuning for over 400 years. Orchestras have 30+ violins, between which the untrained observer would have a difficult time distinguishing, let alone identifying as having come from a particular maker’s hand. And yet experts can frequently tell at a glance when, where and by whom that violin was made. And ALL of them have four strings (count ‘em): G, D, A, and E. No five-string violins in the orchestra!
The violas, too, have their four strings, always at C, G, D and A. They are less tightly defined, however and are all over the board in terms of size and shape. Some are so large that most normal-sized people can’t play them, and some are not much larger than a violin. But they all have those four strings, tuned exactly a perfect fifth below those of the violin. No five-string violas, either.
NON-traditional is OK, too.
Really, a viola works best at what it does, and a violin works best at what it does, as specialized tools…but when they are so close in size—indeed, sometimes overlapping—what prevents us from having one instrument that covers the full range of both? A five-string fiddle?
Well…that isn’t as easy as it sounds. The physical size of a violin is barely big enough to really produce the open G-string tone, so simply adding a low C-string will not work well…and the viola is almost too big to make good high-pitched notes, so adding a high E to a larger viola is usually not very satisfactory either.
Five-string fiddles specifically designed for five-strings
But it CAN work…with some tweaking. Honestly, probably a five-string fiddle would work best in the size of a small viola—say, 15”—or even 15.5”. But country fiddlers and bluegrass fiddlers, who are waking up to the desire for a fifth string, and a lower range, don’t want a “five-string viola”–they want their instrument to fit in a regular fiddle case—not a viola case. They want a handmade five-string bluegrass fiddle.
What has worked for me, so far, is to maintain the “footprint” of a regular violin, but increase the depth of the body a little; lengthen the pegbox, obviously, for the extra peg and string; thin the plates just a little more, and deepen the bassbar a bit. I may try widening the center bouts just a little, too, sometime. But for now, I have a working model, with which everyone seems very pleased: it is very easy to play, has good balance across all five strings, a big deep bass end on the C string, and clear, strong high notes on the E string.
So, when a fiddler wants to be able to go low and growly, he/she can do so. When he/she needs a high end for some special sizzle, it is there. All in one fiddle case. A five-string fiddle case.