Saddle Stitch Thread LengthTanner Guild
Calculate thread length needed for saddle stitching based on stitch line length, leather thickness, and spacing density.
Common values: 3.0mm (~8.5 SPI), 3.85mm (~7 SPI), 4.0mm (~6.5 SPI).
Calculation formulation rules:
Saddle stitching is a dual-needle locking weave technique. It consumes twice as much thread as the stitch path length plus thickness allowances for each hole crossed. Your output incorporates a safety factor of 4.5x line length multiplier + stitch thickness allowance..
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