Friday, August 7, 2009

Around the corner

Here's the mostly done instrument. Strung with monofilament as planned.





Tuesday, April 14, 2009

Soundboard glue-up


Here is the soundboard being glued down with 'go bars' for clamps that spring from the ceiling to the perimiter of the soundbard against the soundboard liner.

Wednesday, March 4, 2009

Soundboard and supports.

After the soundboard has been thicknessed it is sized using a solution of water and hide glue. It is painted on one side of the soundboard, which causes it to curl up like a piece of cinnamon bark as it dries, and then the other side is painted.













After it dries completely the soundboard is flat again. The upper belly rail is glued along the lower curve to support the soundboard.








Liners also support the soundboard and they are glued in place on the inside walls








The lower belly rail is glued in place.





Tuesday, February 17, 2009

Case and soundboard











I decided to keep the original RCM 1 shape--there being no need for extra tail room. Here is the back (with dog).






The extreme point would require rather sharp angles, so rather than sawing them, I simply planed them to joint.














The bentside was bent using a bath of boiling water--simply a lasagna pan on the stove top, the wood marinated again and again until plyable.













The spine and bentside tacked in place on the belly.













The soundboard planks hide glued together with one edge rough cut













Then both edges rough cut and then fitted in the case with the shop snoopervisor at the helm.














Now the long process to thin the soundboard

Tuesday, December 23, 2008







Here are all the jacks assembled on the keyboard. They will later be guided by pins along the wrestplank.





Here's the base being glued up.
















Tuesday, November 18, 2008

More Keywork


The keys are cut out on the bandsaw, sections at a time, and then a coping saw fited with a wire blade to cut out the sharps.





Bloodwood keyplates are cut and scraped and buffed to a polish.

Time to start gluing up the jack-arm assembly with these great little spring clamps I bought-a 6 pack for one dollar! All of them glued to a little foot that keeps them at roughy 4 degrees tilted back. I'm gluing every other one to make it a little easier to get at them. Every so often I take my square to check for true.





Wednesday, November 5, 2008

Keyboard cont.: Balance pins and keyplates

The key rack will require balance pins. The short length of keys means that the balance point lies under key plates, and thus can be no higher than the thickness of the key tails. I cut small 2mm diameter nails in half and then off with their heads! The round thing in the foreground is a magnet to pick up the iron filings as I go along.
Here the new, cut, rounded over, and polished balance pins are press fit through the felt padding and into predrilled holes along the balance rail (seen here not yet fully set in place). You can also see the key plate material here which I believe is African Padauk.












The key holes must be opened up at the rocking points on the top and bottom. I used a hardened spring with a bolt through the center for a handle to facilitate this. It essentially presses the wood fibers laterally, and I understand this is a traditional method for opening this hole.

Friday, October 24, 2008

Tongues, axles..ACTION!

Each jack requires a spring. Normally hog or boar bristle, which will last for centuries, by the way, I'm using high carbon monofilament (30 test) which I happen to have a lot of-so, why not use it?!









I use sewing needles of various diameters for my drills heated up and flattend and filed at the end, and then reheated and water hardened back. I use a Dremel-type felxible shaft grinder with a chuck that will hold these small homemade drills.










Once drilled thru the back and down through the toungue slot they receive a section of "bristle", which is later trimmed.






















A jig was made to drill the axles for the tongue. The tongues will be angled back about 1-2 degrees to best facillitate the return when the key is disengaged. The drill is another needle slightly larger than the axle.

For the axle I use ordinary pins (the type that come with new men's dress shirts). The pins are a loose fit through the first tang and the tongue, but later tapped a few millimeters into the second tang of the jack. Here is a video of the process http://www.youtube.com/watch?v=pmrMr-TkND4









The extra bit is clipped off with small wire cutters and filed flat to the wood.

Monday, October 20, 2008

Jack tongues and keyboard rack

The jigs provide uniformity and hasten the work.







Here is the jig I made to cut out tongues. There would be a better way to make tongues had I room for a table saw. Plus I had long thin strips of wood suitable for tongues.









The punch for the plectrum mortises is a pin vice, and a wood cabinet handle. The actual punch is a ground down dry wall screw, heated up and hardened again.







In position and pushed with some body weight rather than struck.








Keyboard marked out and ready to cut and key rack with balance rail




Tuesday, October 14, 2008

The Birth of a Clavicytherium

My hobby is making (hopefully) beautiful and useful musical instruments from discarded materials, such as old furniture, picture frames, etc. Here's my other website http://angelfire.com/folk/inventedinstruments/ .

All of my instruments cost nearly nothing to make, not counting the hot hide glue which I purchase--it's just far superior to any synthetic glues. I use mostly hand tools as I don't have a lot of room in an apartment. My workshop is the kitchen counter. This also means having to set up and take down every time I want to build something.

THE CLAVICYTHERIUM

A clavicytherium is an upright harpsichord such that the soundboard and strings face the player.

Mine will be a simple clavicytherium inspired by the oldest known harpsichord, the so-called Royal College of Music Clavicytherium of 1480.

Unlike the RCM clavicytherium, however, it will have one sound hole and will be strung in "gut", actually high carbon monofilament. So the similarities are minimal, other than the dimensions of the critical bits, like string speaking lengths.

This is being made entirely of found wood from the streets of Baltimore. {Hint: Bulk trash days for furniture}

I start by gluing up and then planing down pine boards for the keyrack.














Each key requires an integrated arm attached to a jack that will come in contact with the string when the key is depressed. Each jack will require a tongue escapement and a bird quill for plucking the string. There will be no damper as is the usual arrangement for harpsichord jacks. Thus, a sustain will be produced.
















This integrated jack/arm/key lever arrangement makes for some awkward setup in terms of cutting out the tongue slot, but not that difficult, ultimately.

I cut out all the arms and jacks




























Then I hide glue them at right angles using coffee stirrers (thanks, Starbucks!) as "go bars" while it sets up








The tongue slot requires a 45 degree angle to stop the tongue from flipping backwards, so several jigs were made, one for cutting out the slot on the band saw, one for "chipping" out the scrap piece of wood with a chisel, one for cutting the tongues, etc. If I were doing this for a living instead of just a hobby, I would make several permanent jigs for my main sellers...maybe in my retirement!