Summary of Contents for StewMac 1933 Pre-war OM-28
- Page 1 StewMac tools + ideas for guitarmaking 1933 Pre-war OM-28 Acoustic Guitar Kit #WRM3H2 Assembly Instructions stewmac.com...
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Page 3: Table Of Contents
CONGRATULATIONS! . . . . . . . . . . . . . . . . . . . . . . . . . . . .44 stewmac.com... -
Page 5: Getting Started
Depending upon your location and the season, you may need to humidify or dehumidify your shop to maintain the Not only does the StewMac Icon Guitar Kit capture the cor- desired relative humidity . It is highly advisable to purchase... -
Page 6: Recommended Tools And Supplies
ColorTone Clear Gloss aerosol nitrocellulose lacquer (6) #3881 Medium bar-style clamp (2) #3714 Blush Eraser #1313 X-Acto knife StewMac Polishing Compound medium #1202 and fine #1203 Small carpenter’s square StewMac Swirl Remover #1204 (optional) Feeler gauges #1811 Foam Polishing Pads (2 or 3) #3414 and electric hand drill... -
Page 7: Kit Parts List
30 Tail block strip 31 Cheesecloth 32 Kerfed lining (8) 33 Cardboard body form (2) 34 Building an Acoustic Guitar Kit 35 Blueprint 36 Bracing pattern Not pictured: this assembly instructions book, scrap wood, and large rubber band . stewmac.com... -
Page 8: Side Assembly
Apply glue to the maple reinforcement strip and place the against the outer side seam . The same caul will fit both the centerline on the marks on the tailblock and to the edge of neck block and tailblock areas . the 3/16" mark . stewmac.com... -
Page 9: Making A Body Mold
. If the fit is too tight, remove small amounts from each side of the U-shape until the waist clamp slides snugly onto the waist (but not so snug that it’s hard to remove) . stewmac.com... -
Page 10: Installing The Side Reinforcing Ribbon
(pictured) . Having the sides properly squared up at this stage is important . stewmac.com... -
Page 11: Leveling The Kerfed Linings
. The rigidity added by the glued top makes the sanding easier and more accurate . If you choose this option, level the top ker- fed linings first (pictured), and sand the back linings just before removing the cardboard inner mold . stewmac.com... -
Page 12: Soundboard Bracing And Fitting
. You can also use a flat block of wood wrapped with a piece of 150-grit sandpaper . Inner and Outer Rings Center Ring .085" Inner and Outer Rings stewmac.com... -
Page 13: Installing The Soundboard Bracing
. Note that the soundboard and the back have been trimmed to allow about 1/8" overhang all around . This offers a little freedom when assembling the top and back to the rim, and will be trimmed away later . stewmac.com... - Page 14 X-braces, and glue the plate onto the soundboard with Titebond or hide glue . The lower clamp jaws should contact the back of your workboard to protect the spruce soundboard . stewmac.com...
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Page 15: Bridge And Shoulder Brace Clamping Cauls
The shoulder brace caul is 2" x 2-5/8" x 1-1/4", with relief to Shoulder brace caul clear both shoulder braces . Use a saw and a chisel or router 2" Shoulder brace caul to make these cauls . 2" 1-1/4" Shoulder brace caul 1-1/4" 2-5/8" 1-1/4" 2-5/8" 2-5/8" stewmac.com... -
Page 16: Fitting The Soundboard To The Sides
. This way, the top fits the sides, neck block and tailblock accu- rately, and you can ensure that the body measures 20" from end-to-end . stewmac.com... - Page 17 . These notches should taper toward the interior of the guitar to match the taper of the braces (pictured) . When the notches are cut correctly, the top will fit into place stewmac.com...
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Page 18: Installing The Soundboard
Mark the spool clamps from 1 through 12 on each side, re- move them, and lay them out in order for quick reclamping . Apply glue to the kerfed linings, align the soundboard and repeat the clamping process . stewmac.com... -
Page 19: Back Bracing And Fitting
. Avoid glue squeeze-out that might stick to strips into five pieces of accurate length to cover the center the notched caul! seam between the back braces . Glue and clamp the center strips into place and allow to dry before unclamping . stewmac.com... -
Page 20: Fitting The Back To The Sides
Titebond to the kerfed linings and reclamp, starting at the neck block . Follow the same clamping order as you did with the top (pictured) . Let the glue dry overnight . StewMac’s tool recommendation StewMac Spool Clamps Item #3715 Assembly clamps with a different twist! The simple spool clamp for soundboard and back assembly, made faster and easier with a hardwood handle . -
Page 21: Routing And Binding
. Wood tear-out is always possible when routing, but espe- cially with long-grain, quartersawn tonewoods . Therefore, start with four “climb cuts,” so-called because the router is “climbing,” or being pulled along as the bit grabs the wood . stewmac.com... - Page 22 . It’s virtually impossible to get it perfectly square everywhere at all times, but with care and a little practice this method will also give you excellent results . stewmac.com...
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Page 23: Installing The End Trim
Remove the tape by warming it with a heat gun (or a hair dryer) held at least 6-8 inches away . Pull the tape off at a 45° angle (pictured) . When warmed, the tape will lift easily without pulling out wood fibers . stewmac.com... -
Page 24: Opening The Dovetail Joint
(pictured) . A Dremel can also be used to remove this wood as shown . Follow with a sharp chisel and a file to smooth the sides flush to the inner walls of the dovetail (pictured) . stewmac.com... -
Page 25: Fit And Fill The Truss Rod Channel
. channel . Once the glue dries, trim off the excess so the filler plug is flush with the peghead . Align adjusting nut to the end of the neck joint tenon Trim flush to peghead face stewmac.com... -
Page 26: Peghead Shaping And Drilling
. Relocate and clamp the peghead the peghead finish . for each of the remaining holes . stewmac.com... -
Page 27: Making A Fretboard
. Measure the thickness of your inlays, and don’t deeper than the thickness of your inlay . The goal is to keep the inlay just proud of the fretboard, allowing it to level perfectly with the fretboard stewmac.com... -
Page 28: Installing The Fretboard Side Dots
. Install the wire up to the 14th fret and stop . The remaining frets, in Test the tightness of a couple of fret ends by prying up a little stewmac.com... -
Page 29: Installing The Fretboard
. Wipe off excess glue and let the glue surface, and align the nut end with the nut line on the neck dry overnight . StewMac’s tool recommendation Essential Fretting Tool Kit Item #3125 Our fretting experts compiled this kit of tools you’ll need for the fundamentals of... -
Page 30: Neck Shaping And Fitting
Titebond in the mahogany slot, and a couple of drops on the mahogany, creating a slot for the nut . The nut should the end of the fretboard . You can sand the edges of the nut when you final-sand the neck . fit snugly . stewmac.com... -
Page 31: Fitting The Heel Cap
In this case, those numbers are . 1 25" x 3 . 1 56" ÷ 11 .312" = .035" . So in our example X = .035" which is between 1/32" and 3/64" . This is the amount to .042" remove at the bottom of the heel . stewmac.com... -
Page 32: The Neck Heel Sets The Neck Angle
11-3/8" from the neck end of the guitar . (Since the neck block has an opening for the neck joint, you can measure from the center by laying a flat object across this opening . ) stewmac.com... -
Page 33: Neck Adjustment: Side-To-Side
(pictured) . This removes a little bit of wood while conforming to the shape of the guitar body . Shake the sawdust off the sanding strip and repeat the procedure on the opposite cheek . Sand equally from side stewmac.com... -
Page 34: Neck Adjustment: Tilt The Neck Up
(we used a brick) . The entire neck and fretboard must be sup- ported when you hammer to avoid breaking the fretboard extension . Nip the fret ends, file them flush, and bevel them as you did earlier; keep the extension supported here, too . stewmac.com... -
Page 35: Finishing
. Don’t use the same sandpaper you used on the rest of the body . Blow-off and vacuum the dust from the open grain pores . StewMac’s tool recommendation ColorTone Aerosol Finishing Kit Item #1850 Even if you're a beginner, you can achieve beautiful results you'll be proud to show off . -
Page 36: Filling The Fret Ends
. Mask the soundboard of the body if staining the back and Mask the interior of the guitar by stuffing newspaper into the sides . body, being sure to tuck it completely into the soundhole . stewmac.com... -
Page 37: Staining
. You release solvent from the finish and help it to cure . Let the now have SIX coats . Let the guitar dry overnight . finish dry for two more days . stewmac.com... -
Page 38: Sanding And Rubbing-Out The Finish
. that can scratch the finish . StewMac’s tool recommendation Foam Polishing Pads Item #3414 Your instrument finishes can have a more professional look when you use these fiber-free foam buffing pads . -
Page 39: Final Assembly And Setup
18" straightedge on the centerline of the fretboard, butted scale length that will provide accurate string intonation at against the nut . Mark on the straightedge the position of the saddle . the center of the 12th fret . Add an additional 7/64" (toward stewmac.com... -
Page 40: Installing The Bridge
Drill the holes through the soundboard, and into the caul, slight notches in the bridge, soundboard and bridge plate . with a 3/16" drill bit (pictured) . We recommend using a These slots will accommodate the strings, and should be stewmac.com... -
Page 41: Fitting The Bridge Saddle
. Take care not to crack the lacquer finish (heat- correct size drill bit . The tuning machines and screws can ing the bushings with a soldering iron can help if needed) . now be mounted . stewmac.com... -
Page 42: Seating The Strings
(pictured) . Install a guitar capo behind the first fret and tighten it just Now measure the overall string action at the 12th fret . A enough to pull the strings down for clearance between the stewmac.com... -
Page 43: Leveling The Frets
You will need to readjust the truss rod if you changed the adjust- Ink the top of each fret with a felt-tip marker pen; ment during leveling . the frets will be level when all the marks begin to disappear . stewmac.com... -
Page 44: Installing The Pickguard
. Protect it with a quality case, keep it away from extremes in temperature and humidity, and install only medium or lighter gauge strings . And start building another guitar! You can’t stop now, can you? stewmac.com... - Page 46 StewMac tools + ideas for guitarmaking 21 N . Shafer St • Athens, Ohio 45701 • USA USA & Canada call toll-free: 800-848-2273 9am-5pm weekdays Eastern time stewmac.com i-WRM3H2 12/19...
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