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Neck Carving Techniques

What is your preferred neck shape?

  • V Shape

    Votes: 2 6.9%
  • D Shape

    Votes: 12 41.4%
  • U Shape

    Votes: 3 10.3%
  • C Shape

    Votes: 12 41.4%

  • Total voters
    29
So I decided to drive out to the local Rockler in the suburbs of Portland....and the Shinto rasps were out of stock. The website has a good price on the tool, but their shipping rates/times leave a bit to be desired. Luckily, I found one on Amazon. Yay free 2-day shipping!
 
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So I decided to drive out to the local Rockler in the suburbs of Portland....and the Shinto rasps were out of stock. The website has a good price on the tool, but their shipping rates/times leave a bit to be desired. Luckily, I found one on Amazon. Yay free 2-day shipping!
Curious if you find the shinto rasps worth the price. I'm leaning towards microplanes now cause I'm a cheap bastard, but let us know how you like them.
 
Curious if you find the shinto rasps worth the price. I'm leaning towards microplanes now cause I'm a cheap bastard, but let us know how you like them.

I've got a shinto rasp and I like it. The coarse side takes a ton of material off when shaving the large facets on a neck.

Here are the tools I use for a neck carve. The only tool not pictured is a spoke-shave that's concave.

AEC25778-6CAC-4025-A811-6F5740DCA294_zpsfx6cuf54.jpg
 
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I know I need a card scraper too, been looking at kits that include a burnishing/hook raising tool as well. I have never tried a card scraper, but everyone seems to swear by them.

A huge value buy for sure. There are YouTube videos showing how to flatten the edges and then creating the bur. not sure if a burnishing tool is required as I've seen it done with a big screwdriver.
 
So I decided to drive out to the local Rockler in the suburbs of Portland....and the Shinto rasps were out of stock. The website has a good price on the tool, but their shipping rates/times leave a bit to be desired. Luckily, I found one on Amazon. Yay free 2-day shipping!
Please tell me what you think of the Shinto. I was under the impression that it was a pull cut, but it's not. I'm not happy with it for that reason. Wish it reversible like a snap in. A small tweak on the design would make it reversible.
 
Please tell me what you think of the Shinto. I was under the impression that it was a pull cut, but it's not. I'm not happy with it for that reason. Wish it reversible like a snap in. A small tweak on the design would make it reversible.

I really dig it for bulk wood removal. It can be a little tough to "get started", but once you get going, wood gets gone quick! It made the initial facets with ease. I used it while stabilizing the blade with a gloved hand and working at a 45 degree angle. Due to its size, it can be tricky at the headstock or heel, but for all in between, it was a breeze.

In fact, I only used the Shinto, a StewMac small/fine Dragon rasp and a card scraper.
 
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Yes, it's tricky to accurately create and reproduce the shape of the back of a guitar/bass neck. When you look close, really good feeling necks are more complicated than simple V's, C's, U's etc. Necks aren't just a simple radius, or a part of a cylinder, or even a part of a cone. They are a 3-D shape, with radiuses that change around the neck, and along the length of the neck. And then there's the transitions at the headstock and the heel.

So, the question is how do you define, measure, layout, and repeatably carve to that shape? Without getting into 3-D Laser Scanning, Graphic Modeling, CNC Machining, Nano-Particle Beams, and all that other new-fangled computer stuff?

Those of us who still shape necks the old-fangled way have developed our own methods of layout and measurement. There are many different ways to get there. My favorite is what I call the 5-facet method.

Basically, I layout and shape the neck in a sequence of angled bevels (or facets). I define these bevels, their angle and width, in simple layouts of the cross section at the 1st and 12th positions; sometimes others. The neck starts rectangular, cut to width and depth (plan) measurements. The layout lines for the bevels are measured and drawn as distance off to the side of the centerline on the back, and distance up from the fingerboard glue line on the side. I draw and cut the primary bevels first, then draw and cut the secondary bevels. This leaves the neck as 5 facets, with the center facet flat, right down the middle. The facets taper in width and twist slightly as they go down the neck. At the transitions, they curve and taper into points.

This brings the neck quite close to the final shape. I make sure all the facets are straight (no lumps or waves) the right width and angle, and symmetrical side to side (if it's a symmetrical profile). Only after all that is right, do I carefully round off the small ridges between the facets. This brings the neck to the final shape.

It's a repeatable process. Using this layout method, I can hand shape necks years apart, and have them measure and feel the same. I have notes, little cardboard gauges, and custom aluminum straightedges as my layout guides. It doesn't take as long as it sounds.

I'm sure that my description above is confusing. Here's a link to a set of old pages showing my process for making Series IV Scroll Bass necks. The 5-facet process starts on Page 8. There are a couple of good pictures of how I lay out and cut the bevels.

Building Scroll Basses- Neck 1

Hi Bruce! Do you have any close-ups of this neck horse?

IMG_2887D.jpg
 
Hi Bruce! Do you have any close-ups of this neck horse?

Sure, here are a couple of quick pictures of it. Basically, each end is a simple vertical vise which is cut to clamp on a 3 1/2" square. That is, a standard 4 x 4. The neck holding fixture is a separate thing that drops into it, clamped at both ends.

IMG_3899B.jpg IMG_3903B.jpg

The vise on each end is made from a pair of 2 x 4's standing up vertically. The ones on the right, in the pictures, are the fixed jaws. They are screwed to the big rectangle of plywood that forms the backbone of the horse. The two triangular end plates with the 4 x 4 feet are also attached to the fixed jaws. I originally had the triangular end plates screwed on solid, but I recently made them removable, with those lower knobs and some pins. It makes it more compact to store.

The left side vertical 2 x 4's are the moving jaws. They pivot on a single screw down at the bottom. A T-nut, a piece of 1/4-20 threaded rod, and a threaded knob do the clamping up at the top.

IMG_3900B.jpg IMG_3901B.jpg

Each neck fixture is made from a length of 4 x 4, adding clamps, threaded bolts, wood blocks, or whatever is needed to clamp onto the necks. I've made up maybe 15 different neck fixtures over the years to hold various standard model necks that I build. Some hold the neck fingerboard down, for shaping the backs. Those face-down fixtures are usually trimmed in width to match the plan width of the neck, allowing full clearance for shaping the neck with angle grinders and files. The face-up fixtures are for putting in dots, polishing fingerboards and fretwork.

These neck fixtures can all also be used by themselves. They have flat bottoms. I can carry them around the shop, set them on a bench, clamp them in a regular bench vise, or clamp them down to a bench.

IMG_3902B.jpg

The whole purpose of this neck horse is to hold the neck rigidly. This makes filing and grinding so much easier. On the first version of it, I actually made the whole frame too rigid and, because of the four feet, it tended to rock a little bit on uneven floors. That was annoying. So I came up with this version, using the sheet of plywood as the center spine. It flexes a bit, so the four feet stay on the floor. Note that the underside of the fixture rests on the plywood spine all along its length.
 
Please tell me what you think of the Shinto. I was under the impression that it was a pull cut, but it's not. I'm not happy with it for that reason. Wish it reversible like a snap in. A small tweak on the design would make it reversible.

I fairly recently got one of the Shinto rasps, and I really like it. It's double reversible. The blade assembly has a fine side and a coarse side, and either side can be installed to cut on push or pull. The one I have is the Planer, which has the overhanging handle on the top.

I've found that the Shinto is particularly good for hard maple. It cuts quickly, doesn't clog easily, and leaves a surprisingly smooth surface. It doesn't leave deep grooves like a rasp.

The one drawback to the Shinto is that it's made for straight, 2-D contours; the outside of a cylinder. Basically a flat file. It's great for the main shank of the neck, but it doesn't get into the blended ends so well. For those areas, I use a large half round file.
 
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