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Tag: Instrument Making

Week 7 – Side Bending

Posted on March 26, 2015December 1, 2019 by Iain 'Cutty' Carlin

Side Bending

  • Thickness sides to 2.5mm
  • Cut to 115mm wide
  • Turn on the heating pad to warm up
  • Mark top and bottom and front with white engineers pen
  • Wet side and wrap in alfoil
  • Mark the waist position on the alfoil and insert into bender with bottom to bottom of jig
  • Put springs on clamps and side blocks after inserting wood
  • Heat for 15 minutes – screw down waist till tight then back off 2 turns
  • Pull over spring blocks to bend sides – may need to pull back and repeat
  • Turn off heater after 15 minutes and leave for a week to set bends

Top braces

  • Plane top braces to 15mm high
  • Cut leftover spruce from top to cover top of join in X-braces –  50mm long and as wide as brace
  • Glue and hold down with masking tape

Main brace hole for truss rod adjustment

  • Find centre of top main brace on front, mark 7.75mm up from botom and drill 9.5mm hole(for access to truss rod nut)
  • Chamfer other braces for top so centre is 3mm wide, remember not to go beyond the bottom width
  • Cut small 45 degree angles on ends of small braces to provide slotting into the cross braces
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Week 6 – Cross Brace

Posted on March 18, 2015December 1, 2019 by Iain 'Cutty' Carlin

Notch front X-brace

  • Use sliding bevel to set angles of cuts
  • Use scribe to measure 7.5mm from top and bottom of ‘A’ and ‘B’ braces
  • Notch for smaller braces into bottom of X-braces
    • Mark either side & cut with dovetail saw at 45 degrees then chisel out with 6mm chisel
  • Glue join of x-brace
  • Glue x-brace to front hold down with go-bars
  • Use wood slivers to get excess glue out of smaller brace cut-outs

 Back

  • With block plane chamfer off braces to a slope
  • Sand with 150 till tops are round
  • Clean off excess glue on back by sanding
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