Radial 60, Large Log Backsawn

Backsawn Analysis- Pine or Hardwood
Radial Sawn vs. Ordinary Sawn

A theoretical analysis of a 52 cm pruned or natural grown log with anticipated 15 cm defective core is made. No allowance is made for log taper. Chosen log size  provides comparison results for  maximum 20 cm board production for both systems. Standard 5 cm by 7.5, 10, 12.5, 15, 17.5 and 20 cm sizes are used to ascertain theoretical recovery and board quality related to growth ring orientation		  
  • Green very high recovery of fully backsawn timber
  • Consistent growth ring arc to width ratio giving highest quality performance and appearance
  • No transitional timber produced allowing drying schedule optimization
  • Growth stress controlled and evenly released during drying
  • Minimal residual stress and bow distortion controlled during drying
  • Option to change wedge angle to produce high quality narrower backsawn timber
  • Manufacturing products that can utilize or developing products that can utilize radial bevels brings full quality and recovery benefits of Radial backsawing
  • Green high recovery possible if lower quality timber acceptable
  • Low recovery of  backsawn with recovery decreasing if quality backsawn increased
  • Transitional recovery higher than backsawn -compromises drying
  • Minimal growth stress control and uneven release during sawing
  • Transitional boards prone to diamonding distortion and spring distortion during cutting and/or drying
  • No option to produce narrow high quality backsawn timber without high wastage

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