The Formicaster

This is the Formicaster. The only thing about it that's remotely Strat-like, however, is the arrangement of three single-coil pickups, with the angled bridge pickup. The body shape looks like a cross between a Les Paul and a Danelectro, but my starting curves for the lower bout were from a 3/4 size acoustic and some of the upper bout from a busted-up, half-sized guitar I pulled out of somebody's trash. The slightly elongated, narrow waist felt right when I made a cardboard cutout of it and held it against my rib cage. The aesthetics of the guitar somehow dictated that the neck and body would join at the 16th fret.

The goal was to make a knockabout guitar with a unique look and a unique sound that could take a lot of abuse, hence the high-pressure laminate body panels. Almost everything about the Formicaster is an experiment or a first for me: the HPL body, the neck joint, the stacked heel, the volute, making tuner buttons, the circuitry, the bridge.

 

The headstock is either inspired by a blowing candle flame or Casper the Ghost. The nut is Corian, as are the tuner buttons and the knobs for the sliding pots. I got the tuners from eBay, but the buttons were heavy, cast metal and made it feel neck-heavy. The dots are tiny mother-of-pearl buttons in two different sizes that I harvested from a huge box of buttons that we'd inherited from my mother.

Click here for information on building the neck.

Note the careful matching of the grain between the back of the instrument and the access hatch cover. With fine material such as this, it's important to bring out as much of the natural beauty as possible.
Bending the HPL was pretty easy. A quick spritz of water on the back, rock it a little, and wait for it to give. Reverse bends are no trouble, either. The temperature of the bending iron isn't great enough to burn the melamine coating.
Here are the mostly-done sides, laid out on the plan to see how well they fit. Minor corrections are easy; unlike wood, there are no fibers to crush and make flat spots. I bent the cutaway by softening it on the hot pipe, then holding it on a scrap of metal tubing around 1.5 inches in diameter until it cooled. Click here for further details on building the body.
The bridge has six individual height-adjustable saddles that slide on an aluminum plate, mounted below the surface. The blocks are L-shaped, with a leg that extends down into the slots. Locking screws for intonation adjustment are accessible from the access plate on the back of the guitar. The strings anchor in slots in the bridge plate.

My first design had the plate above the guitar top, but I decided to put the plate under the top for a cleaner, unique look. I decided that intonation adjustment screws were a waste of time, since you basically only have to set the intonation once during a setup. With this design, you slide the saddle to the intonation point and lock it from below.

The plate extends from the bridge pieces to the holes for the ball ends. The mahogany bridge block is then glued over it to further stiffen the area and to kill resonances that could cause feedback.

 

The pickups are wired in series, with individual sliding pots for mixing. Master volume and master tone controls set the overall sound. The reverse-wound pickup is at the neck, and the neck pickup has a phase reversing switch.

The pickups are cheap ceramic single-coils, courtesy of eBay, loud and not particularly subtle.

I could have/should have tinkered more with the slide pots. I used 100K audio taper pots, but tests indicated that 50K or perhaps as little as 33K would have been sufficient to control the pickups, and would have given me an expanded adjustment range. These are a little abrupt, but the continuous adjustment makes it easy to dial in just the right amount of twang or thickness.

 

The control cavity is shielded with aluminum tape. The area over the controls on the back of the guitar is shielded, too, and a phosphor bronze spring connects the back area to the rest of the shielding when the back is glued on.

The electronics are star-grounded, and the guitar is very quiet, surprisingly so for single-coils. The slide pots are wired as variable resistors, not potentiometers (single-ended). Grounding or floating the "far" end of the resistors made no difference in hum, so I let them float. I'll take one more step in quieting--shielding the insides of the pickup covers and grounding them to the bridge.

The Formicaster sounds, unsurprisingly, a lot like a Strat. The solo'ed pickups sound like their Fender equivalents, but the hollow body adds a little something extra, and I think the sustain is better than most Strats. The sound begins to change with multiple pickups. With the series-wired pickups, it gets louder as you add more pickups. All three on gives a thick, complex sound.

The reverse-wound, reverse-polarity pickup is at the neck, so that I can have humbucking in neck-middle and neck-bridge. The neck pickup also has a phase-reversing switch for a full repertoire of twangy, boingy, and hollow sounds.

Sound Samples
In Phase Out of Phase
neck
middle
bridge
neck-middle
neck-bridge *
all three
neck-middle
neck-bridge
all three

The above recordings were made with a GuitarPort at its default/bypass settings (no amp emulation), with the guitar volume on 10 and the tone control at 10, except for neck-bridge *, which is played through my Fender Blues Jr. Amp.

No fancy playin' here; just some simple guitar sounds.

More Formicaster:
  • The Body
  • The Neck
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