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Week 3 – Reinforcement and Sound Hole Sculpting

Posted on February 25, 2015December 1, 2019 by Iain 'Cutty' Carlin

Back reinforcing strip

  1. Glue reinforcing strip made from cross cut strip taken from guitar top/front.
  2. Burr side up and overlap top and bottom ends on back and glue down. Won’t necessarily be a strip the whole length of back so glue a shorter strip if necessary. Hold down with masking tape.
  3. Clamp down using the clamping/joining jig for 5 minutes. Cover with paper to prevent wood from sticking to clamp bar
  4. Remove clamps and wipe off excess glue and re-clamp for 1 hour

 Cutting circles for centre sound hole decoration and rosette

  1. 1.5mm router bit and special jig on router rotating round a 1/4″ pin. Set depth of bit to 1.5mm
  2. Drill 1/4″ hole into sound board according to centre hole in pattern. Used a bullet nail to put hole through pattern into sound board.
  3. Place piece of backing board (MDF) under sound board to uses to insert pin into.
  4. Drill through sound board and into backing board. Drill was too sloppy for pin so has to re-drill backing with new drill. Sound board hole was also a bit sloppy so had to account for that when routing
  5. Practiced routing concentric circles round sound hole on piece of MDF to make sure radius was set correctly
  6. Block planed edge of laminated white/black/white/black decoration for circle material
  7. Scribed 2mm side with a marking gauge set appropriately. Keep scribing from both sides until almost through to centre material then cut with a knife. Scribe kept going off line so need to do with care
  8. Put material into channels to make sure it bends. If it’s too dry it will break
  9. Put glue into circle channel and then press in beading material one circle at a time.
  10. Wipe off excess glue
  11. Get a piece of off cut that fits over the inserted inlays and clamp down on bench. Leave for an hour and a half to dry

Block planed and joined two pieces left from back  and held together with masking tape in order to make rosette inlay next week.

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