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Detailed plans of a the Dreadnought 12-String Guitar based on classic Martin D12-28 herringbone made so popular in the 1930s and 40s.
While wood selection can be whatever the luthier or customer desires, the classic D18 uses ribbon cut Genuine Mahogany (Honduras Mahogany) back and sides with Sitka Spruce Top. The D28 uses Indian Rosewood with Adirondack Spruce Top.
Note that the original pre-WWII D28's used Brazilian Rosewood. Unfortunately that wood is no longer available and is on the endangered species list. Also, since quality Adirondack Spruce can be difficult to obtain, consider either Sitka Spruce, or European Spruce for the top plate and braces.
Note: As ALL of our plans are sold as digital downloads, when you complete your plan purchase with us, you will automatically be given a download link to access the plans.
The following tabs detail what you will receive with our Dreadnought 12-String Guitar Plans:
Total Instrument Length: 1087.2mm (42.80”)
Upper Bout: 293mm (11.96”)
Lower Bout: 397mm (15.63”)
Waist: 274mm (10.79”)
Body Length: 513.8mm (20.23”)
Depth At Heel: 95.3mm (3.75”)
Depth At Butt: 120.7mm (4.75”)
Neck Width @ Nut: 47.6mm (1.87”)
Neck Width @ Body: 55.2mm (2.17”)
Fretboard Radius: 406.4mm (16.0”)
Scale Length: 645.2mm (25.4”)
Classic Dreadnought Shape
14-Fret Neck - Standard Width
Neck Connection: Bolt-On, Dovetail, or Mortise
Fretboard Radius & Neck Profile Sections
Closed Pegged w/6L & 6R Tuners
Larger Bodied Guitar
Traditional X-Bracing
Adjustable Truss Rod in Neck
Standard Acoustic Belly Bridge, & One Optional Shape
Ideal for Flatpicking & Fingerpicking
5 Sheets of Drawings
Overall guitar plan with notes and dimensions
Details of Complicated Construction Areas & supplemental Photographs of Key Construction Items + Descriptions
Longitudinal and Lateral Sections Through The Guitar.
Top Bracing Layouts Top and Side Views
Three Neck/Body Connection Options: Bolt-on, Dovetail, Mortise & Tenon.
Two Belly Bridge Shape Options
Enlarged Purfling Details
Back layout and Back Brace layouts
Complete Template Sets Including: Top, Side Contour, Neck Contour, Bender Form Insert, Headpiece Layout, Back Arch Template & Top Layout Template
3 Sheets of Drawings
Inside Form Plan Top Front and Side Views & Details
Workboard Layout
2 CAD Files in .DWG & .DXF Format. The Last Image on This Sales Pages Shows The Content of These Files.