Posts Tagged ‘Scroll’

More Scroll Progress

Please share with your friends!

More Scroll Progress

Final carving tasks

I had removed most of the rough wood, in the last post, and had smoothed the outside of the turns of the scroll.

Now it is time to undercut the turns of the scroll so that they have a more delicate look, and are physically a little lighter.

Carving the volutes.

Carving the volute and neck.

 

Completing the volute and pegbox.

Completing the volute and pegbox.

 

So, at this point the one scroll is essentially done, and the other will soon be done as well. I will complete the purfling on the two instruments before setting the necks, so that is next.

Thanks for looking.

If you found this post helpful, please share with your friends!

Scroll Carving

Please share with your friends!

Scroll Carving

Rough wood removal

In the last post, I demonstrated how I use a thin saw, to cut to the layout lines, so as to facilitate removal of the rough wood, preparing to carve.

Now I complete the removal of the rough wood and begin to carve.

Removal of remaining rough wood.

Removal of remaining rough wood was quite easy, because of all the saw-cuts.

Scroll-Carving

I begin to incise the outline of the eye, and carve to volute to size.

Next, I begin to incise the outline of the eye, and to carve the volute to size.

 

Trimming the scroll to the layout lines, before beginning to undercut the turns of the scroll.

Trimming the scroll to the layout lines, before beginning to undercut the turns of the scroll.

 

Starting to look like a scroll...barely.

Starting to look like a scroll…barely. I planed the cheeks of the scroll to the layout lines.

 

It is always nore encouraging when the scroll begins to take shape.

It is always nore encouraging when the scroll begins to take shape.

 

I want to complete the two instruments side by side. I have to stop and work on the other scroll.

I want to complete the two instruments side by side. I have to stop and work on the other scroll.

 

Carving the pegbox.

Carving the pegbox.

 

One scroll is nearing completion, the other is just begun.

One scroll is nearing completion, the other has just begun to take shape.

 

The next web-log post should include two completed scrolls, the installation of two fingerboards, and the setting of two necks. But perhaps that is too ambitious. The holidays seem to be a difficult time during which to get things done. (sigh…)

However, along with the graduation of both back plates, removal of the inside forms (molds) and the final assembly of the instruments, that is pretty much all that is left to do. Oh, yes, and purfling both plates on both instruments. I used to install purfling before completing the arching of the plates, but it frequently resulted in uneven plate overhang (with which I was quite disappointed) just because the purling had locked in the shape of the plates, and so, if the rib garland had changed shape at all, I was stuck. When I began purfling after assembly, the overhang problems pretty much went away.

Anyhow, that is how the project is progressing.

 

Thanks for looking.

If you found this post helpful, please share with your friends!

Scroll, pegbox and Neck-set

Please share with your friends!

Scroll and Pegbox completion: and Neck-set

Scroll and Pegbox Completion:

When I last posted, I had just temporarily attached the fingerboard to the neck, but had not carved the pegbox, nor the fluting on the back and top of the scroll. In the past I have completed those before attaching the fingerboard, but this time I was anxious to get going, and it seemed a good idea at the time….

So…I first shaved the fingerboard sides to fairly closely match the handle portion of the neck, and then began carving the pegbox.

Carving the pegbox.

Carving the pegbox.

 

Carving complete: scraping and filing to follow.

Carving complete: scraping and filing to follow.

 

Then I could complete the outside of the pegbox, finish tapering and scraping the handle portion of the neck, and carve the fluting on the scroll. I still had the centerline I had scribed when I first cut out the scroll, so I worked from there, and tried to “color inside the lines.”

Nearing completion.

Neck is nearing completion, outside and inside of Pegbox are pretty much complete. No fluting yet.

 

Fluting nearing completion...back view.

Fluting nearing completion…back view.

 

Fluting nearing completion: front view.

Fluting nearing completion: front view. Lots of scraping left to do.

 

Neck Mortise

Before I can set the neck, I have to lay out the exact footprint of the neck heel on the centerline of the corpus, where I will cut the mortise through the ribs and into the neck-block. I have deliberately left the heel long, so that I can set it through the neck-block, and not have to worry about fitting against the back button, because I haven’t installed the back plate yet. I will trim the heel afterward, and, when I level the back of the corpus, just before installing the back plate, I will level the heel right along with the linings and blocks.

So here is how the neck mortise went:

Mortise layout

The mortise is laid out off the centerline, which you can barely see in this photo, because one top rib nearly obscured it.

 

mortise beginning

First, I removed the rib ends, and double-checked my layout lines.

 

Front plate cut out.

Then I removed the waste wood from the edge of the front plate.

 

Mortise carving

Then I began chiseling away the block wood, to open the mortise.

 

Neck-set

The mortise has to fit the neck in every respect: It has to be the right width and shape, so that the neck goes to the correct depth. (I wanted a 6mm overstand at the edge of the front plate.) It has to be the right depth so that the distance from the front edge of the nut, to the top of the front plate will be exactly 130mm. The sole of the mortise has to be flat, so as to fit tightly against the end of the neck, but at the correct angles, both laterally and fore-and-aft, so that the neck is not twisted in relation to the corpus, the centerline of the neck is in line with the centerline of the corpus, and the projection angle is either exactly right or just a shade high. I have had instruments change fairly rapidly after they have been strung at tension for a while, due to the top bulging a little as it is compressed by the string pressure, so, I deliberately set the projection angle just a tiny bit high, anticipating that it will change a bit under string tension.

Dry-fit neck-set.

Dry-fit neck-set. No glue, yet. Just the final check of all measurements and angles.

 

Dry-fit check of overstand mark and neck length mark.

Dry-fit check of overstand mark and neck length mark. Both are correct.

 

When I am finally satisfied that all is correct, I remove the neck one last time, slather the hot hide glue into the mortise, and shove the neck home for good. I quickly check all measurements, to make sure I got it in correctly. I only have a few seconds before that glue sets up permanently. Fortunately, all was still good, and I applied a single clamp to hold it until the glue dries.

Neck-set, glued, and clamped.

Neck-set, glued, and clamped.

 

What’s Next?

You can see that I have about 10mm of extra heel hanging out behind the back of the neck block. I will saw that off, nearly flush, plane it as close to flush as I dare, then, after removing the mold, installing the back linings, and trimming the linings and blocks, I will level the entire back of the corpus, including the heel, on a “sanding board.” When all is perfectly flat, I will install the back plate, and the violin will begin to take on a life of its own.

For some reason, after I close the corpus, or thereabouts, I cease to see the instruments I make as a “project I am building”, and simply see them as an instrument I am working on. I am working on a violin, at that point, not just something that will become a violin. It is a strange feeling, but it has happened on every instrument.  A student, who built his first instrument under my guidance, put it another way: as the instrument came together, he suddenly said, “This is getting real!” I knew exactly what he meant.

Next time I will remove the mold, install the back linings, shape the blocks, and maybe get this thing closed up!

 

Thanks for looking.

 

 

 

 

If you found this post helpful, please share with your friends!

More Progress: Plates and Scroll.

Please share with your friends!

More Progress: Plates and Scroll.

Completing the Back Plate

I continued planing away wood from the inside of the back plate until it was very nearly correct, then switched to scrapers, and completed the inside surface, so that it looks to be a smooth continuum of curves, transitioning without a ripple. The  plate will require no further attention until I am ready to install it. Unlike the front plate, I intend to install the purfling later, after I am completely sure how the garland will respond to having the mold removed (sometimes they can move, and change shape a little.)

Back Plate Graduation complete.

Back Plate Graduation complete.

 

Scroll Progress

I also continued working on the scroll. My hands were getting pretty tired, so I took a break from that. It is still quite rough, but, here’s how it looked at break time:

scroll beginning

Long way to go.

 

scroll progress

On the right path, but “miles to go before I sleep.”

 

Bass Bar Fitting

To fit a bass bar, I begin with a completed front plate, and lay out the position of the bass bar, so that the distance from the center to the bar, level with upper and lower bouts at maximum width, is 1/7th the full distance from centerline to the edge at those respective points. Usually, that means that the lower point will be about 15mm from the centerline and the upper one about 12mm (as it is in this case.) I lay out a line through those two points, and observe where it is, nearest to the bass-side f-hole. If it is too close, I “fudge” it away, a bit, trying not to change the angle. (The bass bar has to clear the f-hole.) Then I mark the two ends, 40mm away from the ends of the plate, and that is the place to fit the bass bar: the “footprint”, so to speak.

Bass bar position laid out.

Bass bar position laid out.

 

I use chalk to fit my bass-bars. I have never had a good enough eye, and a sure enough knife-hand to accurately fit a bass-bar without the use of chalk, though I have known master makers who regularly did so…perfectly. (Sorry… I’m not good enough for that.) On the other hand, I have had some nasty experiences with the residue of blue chalk mingling with the yellowish hide glue when installing a bass bar: it left a very ugly green stain…and it never completely came out. So…what to do? In the first place, I switched to pink chalk. If a little chalk is left, the glue will simply make it look a bit orange. (No problem.) But, I really don’t want chalk residue at all.

A friend showed me the paper “gauze” tape available in pharmacies. It is thin enough to completely conform to the surface of the plate, and  produce a good fit, and, it is slightly translucent, so I can see my layout lines through the tape, and keep the chalk on just the path of the bass bar. I first use a compass to mark the general shape of the bottom of the bass bar, and then trim it with a knife and a small plane. That gets me “in the ball-park,” so to speak. After that, it is chalk-fitting time.

The front plate is made of European spruce, but I chose Sitka spruce for the bass bar. There is quite a contrast in color between relatively fresh European spruce, and well-aged Sitka spruce. It actually made it a little difficult to see the pink chalk against the dark wood. But it worked.

Bass bar blank, knife-trimmed after tracing the shape with a compass.

Bass bar blank, knife-trimmed after tracing the shape with a compass.

 

paper gauze tape

This is the paper gauze tape I use for chalk-fitting.

 

Paper gauze tape and pink chalk

Paper gauze tape and pink chalk, ready to begin chalk-fitting.

 

Layout lines visible through the tape.

Layout lines visible through the tape.

 

Layout lines traced over on the tape, to make them more visible.

Layout lines traced over on the tape, in pencil, to make them even more visible.

 

Chalk on tape.

Chalk on tape.

 

Chalk transferred to bass bar

Chalk transferred to bass bar

 

The idea, in any chalk-fitting procedure, is to press the fitted part (being fitted) into the chalked surface to which it is being fit, then trim away only the portions where the chalk transferred. So, in the case of the bass bar, I need to press it into the chalked top plate, and then check the bottom of the bass bar blank, to see where to cut. I trim off the obvious spots, and try again. Ideally, every time I try, I will get a broader transfer of chalk. When the whole area gets a light dusting of chalk at one time, the fit is as close to perfect as I can get it. I remove the tape, wipe off any chalk residue, slather the hot hide glue onto the bottom of the bass bar, and clamp it home. On a good day, it takes me a half-hour. On a bad day? Don’t ask… 🙂  This time wasn’t bad, though.

Chalk-fitting complete; Dry-clamped to check fit.

Chalk-fitting complete; Dry-clamped to check the fit.

 

Tight fit

The fit is good!

 

Glued and clamped

Glued and clamped. 

More Scroll Progress

While the glue was drying on the bass bar, I went back to work on the scroll. It was looking verrry rough when I had to take a break, so it is nice to see it progressing better, now. There is still a lot to do. I have to excavate the pegbox, and cut the fluting in the volute. But this is as far as I am going tonight. I am glad to call it a night, and let my hands rest.

More scroll progress

More scroll progress: there is still a long way to go, but it is looking better.

 

Scroll partly complete.

Final status for tonight. Looking a lot better, and more encouraging to see.

 

I have other things to do tomorrow, so I may or may not get to work on the violin. At the very least, I expect I will be able to trim the bass bar to the shape I want it, but beyond that, I don’t know.

 

Thanks for looking.

If you found this post helpful, please share with your friends!

Neck and Scroll Carving Procedure

Please share with your friends!

Two Hand-carved Five String Fiddle Scrolls in Progress

First: Lay out the Side Profile

I created a template for a five-string fiddle neck and scroll when I made my first 5 string blue-grass fiddle. The template is fairly crude; just a cutout of thin plywood (door-skin material). I have other templates I have made of aluminum, and still others of plexiglass plastic. But that is the starting place, regardless of template materials. I know how thick the billet needs to be, and how long, so I simply place the template on the billet of curly maple, and trace around it with a ball-point pen. (I used to use a pencil, but the ink is easier to see against the wood.)

Violin neck billet laid out for cutting.

Violin neck billet with profile laid out. Notice that the pegbox is a little shorter, because it only has to accommodate four strings.

 Next: Cut out the Profile

I use a band-saw to cut out the profile of plates and necks. I do have a bow-saw that I made for such work, and I can use it if need be. but I find the bandsaw so much easier to control and so much faster, and the results are so much better, that I quit using the bow-saw after about two instruments. It looks nice, hanging on the wall.

Power Tools vs. Hand Tools?

Some people are insistent that the “only right way” to make a hand-made instrument is to use nothing but hand-powered tools. I have built one instrument using only hand tools. I will probably never do so again. There is a reason that bandsaws, drill presses, etc were developed: they not only save wear and tear on your body, they do better work, as a rule. Can they cause damage? Absolutely. So can any tool.

I use a practiced eye and steady hand to guide the billets through a bandsaw. I complete all the carving of each hand-carved instrument using gouges, planes, chisels, and scrapers.

The vast majority of my work is done using hand tools, but there are certain tasks for which I use the appropriate power tool, and make no apology for doing so. (By the way, I live eight miles outside a small town, and when I go to town, I drive…I don’t have a horse, and my time is too valuable (and limited) to walk that far just to satisfy some atavistic “back in time” quirk. I use electric lamps, etc., too, unless we have a power outage.) (sigh… OK, rant over…)

Violin neck billet with side profile cut out.

Here’s that same violin neck billet with the side profile cut out.

Lay out the Front and Back Shapes

I have a table of measurements I use, to lay out the front and back lines of the scroll and neck. The top of the neck is just over 24mm, the widest part of the pegbox front is 26mm, the distance from the leading edge of the nut to where the neck intersects the top plate is 130mm, and so forth.

I lay these out using a metric rule, a compass,  and a flexible straightedge. The main straightedge is just a stainless steel ruler with a cork backing that I bought from a fabric store. But I need a very flexible straightedge when I am laying out the curly portion of the scroll, so I cut a spiral strip out of a large soft-drink can (actually it was one of those oversized “energy drink” cans. Someone at work had it, and was going to throw it out, so I snagged it and made good use of the thin aluminum sides.) It is about 40mm wide, and long enough to wrap around the scroll, giving me a clean, smooth curve to scribe in with the pen. Aluminum flashing would work, too, but this was free. You can see the layout lines in the next step.

Cut off the Excess Wood from the Pegbox

I use the bandsaw, again, to trim all the waste wood from about two inches down the neck up to where the pegbox begins to disappear under the curve of the scroll. I leave the scroll and almost all of the neck full thickness, so that the billet will sit flat on the drill press table, and I can get the pilot holes for the pegs drilled parallel– perpendicular to the centerline of the neck.

Another nice thing about leaving the handle portion of the neck for last, is that it leaves me two parallel surfaces, so I can clamp the scroll in a vise, and use both hands to control the gouge, plane, saw, or other hand tool.

Front and back profiles laid out; excess wood trimmed from cheeks of pegbox.

Front and back profiles laid out– excess wood trimmed form cheeks. You can see, too, that I already began carving the heel (or chin) of the pegbox. Just a personal preference.

Layout and Drill the Peg Pilot Holes

Some people wait until the whole violin is completed, including varnishing, to drill the peg holes, but I find it too difficult to get them parallel with one another that way. If I can drill a 1/8″ pilot hole for each of them, using a drill press, so that they are exactly perpendicular to the center of the neck, I find it much easier to complete the neck later, than if I have to try to get them right with no flat surface from which to reference the perpendicularity of the holes. You’ll see these holes in the next blog post. So long as they get done before I cut the excess wood from the neck and scroll, I will be OK, because the neck will still sit squarely on the drill press table.

Carve the Pegbox

There are several ways to do this. A lot of makers use a drill to hog out the waste wood from the hole, and then use chisels and gouges to smooth and complete the work. I usually just use the chsels and gouges right from the beginning…one mistake with the drill, and the scroll becomes firewood.

I use a narrow, flat chisel to begin the work, and develop some depth, then use a wider, flat chisel to flatten the inside of the pegbox “cheeks,” and to deepen the box floor. I have to be careful to not go too deep. I have (once) cut so deep that, later, when I cut the fluting (volute) from the outside, I cut through into the interior of the pegbox. That is another good way to transform a nice scroll into firewood. Pretty sad when that happens.

I tend to begin by carving the outside of the pegbox heel… it makes me feel better about the scroll, if something about it is already starting to look like a finished scroll.

Four preliminary steps shown all together.

Here you can see all four of the preliminary steps, including the beginning of carving out the pegbox. You can see, too, the extra length in the five string fiddle pegboxes (on the right).

I will show photos of the succeeding steps in the next blog post. What you see above, though, is the beginning of all those nice violin, viola, cello, bass and five string fiddle scrolls you have enjoyed looking at.

Thanks for reading.

If you found this post helpful, please share with your friends!

How I carve a Scroll

Please share with your friends!

Cello Scroll Carving Made Simple 🙂

There is nothing special about the way I carve scrolls. As far as I know, this is how everyone else does it, too, more or less. I am only sharing how I do it.

Start by tracing and sawing out the profile of the whole neck.

I don’t have a photo of the scroll as a simple profile, but I begin with the billet (About 6″ x 3″ x 20″), and trace my template onto it, then use a bandsaw to cut the shape of the profile. I use a oscillating spindle sander to remove the saw marks, and perfect the profile right to the line. While the profiled block is still “square”–that is, while the sides are still parallel, I lay out the peg hole locations and use a drill press to make 1/8″ diameter pilot holes where each peg will be. I drill all the way through, so that the holes are clearly marked, and are perpendicular to the center plane of the neck.

Next cut out the pegbox and at least a few inches of the neck

I hollow out the pegbox before carving the scroll proper. Some people use a drill to get started. I have done it this way, but it seems a little risky, unless you put some sort of limiter on the drill, to avoid going too deep– and even then it is easy to go out of bounds. I use a narrow chisel to remove most of the rough wood, then a wider chisel to smooth the inside cheeks of the pegbox. I also saw off the excess wood on the outside of the pegbox, and plane those faces flat.

Then draw the shape of the scroll itself.

Usually we use a template for this, as well. Some people plot out each scroll with a straight-edge and compass. I have neither the time nor the inclination. In this case, my templates came from a poster of the 1712  “Davidov” Stradivarius cello, now being played by Yo Yo Ma. Some information was lacking, and I filled that in from Henry Strobel’s book on cello making.

And begin cutting:

Once the scroll is drawn out, I clamp the neck to my workbench and, using a Japanese-style pull-saw, I begin cutting slots nearly to the layout lines of the volute. I rotate my position a few degrees, and make another cut. I have to be careful to avoid cutting too deeply, but this method allows me to chip away the waste wood rapidly, and the scroll begins looking like a scroll rather quickly.

Beginning the scroll, proper.

Pegbox is complete, volute partially carved. The cut lines are visible on the portion of the volute that has already been carved. Now we will carve the scroll, proper.

Cutting more kerfs to remove wood.

Care must be taken to avoid drifting across the line into the turns of the volute.

Cutting a series of kerfs for wood removal in carving a scroll.

You can see the direction this is going…I will continue to slice down nearly to the line, rotating a little each time, until I have gone all the way around.

Using a gouge to outline the eye of the scroll.

Once the kerfs are all in place, and to the correct depths, I use a gouge to outline the eye of the scroll, so as not to damage it with the saw.

Kerfs in place, and eye of scroll deeply incised. Carving can begin.

All the kerfs are complete, and the eye is deeply incised with the gouge–I am ready to start carving.

Use a flat chisel to remove the waste wood, and the scroll begins to emerge.

I use a flat chisel to remove the waste wood, and the scroll begins to emerge.

Once the waste wood is completely gone the

Once the waste wood is completely gone the “undercut” carving can begin.

Bi-lateral symmetry

I try to make sure the two sides match symmetrically, before beginning undercut. I do the outside fluting last, to avoid damaging it while carving other parts of the scroll.

Bass side of cello scroll, nearly complete.

Here is the bass side of the scroll, nearly complete.

Treble side of cello scroll, nearly complete.

And, here is the treble side.

Cello neck and scroll, nearly complete.

The neck and scroll are nearly complete. I will continue to fine-tune and scrape the scroll, perfecting it as best I can, right up to the day I begin varnishing.

Fingerboard installed on Cello neck, with hide glue and clamps.

I have prepared the fingerboard, and now I have installed it, using hot hide glue and clamps.

So– that was entirely enough for today. Tomorrow I will continue to refine the scroll and neck, and try to get the neck set. If I succeed, then I can remove the mold and install the back plate.

If you found this post helpful, please share with your friends!