Leather stitching, whip plaiting, Turk's heads, paracord bracelets and handle wraps — the guides, the tools, the video shelves. All free.
Fresh at the bench
The stitch math, the knot counts, the cord lengths — nothing here is for sale.
SPI to spacing: the thread's length for your seam — the app's own formulas, in the browser.
Bights × leads: how many cords a knot needs, and its crossings — the knot math, live.
wrist + π×thickness, the cord on a handle, gutted — the wraps' real figures.
Bights, leads, gcd: why some knots need one cord and others three — the knot's own arithmetic.
The shelf
Leather, whips, knots, wraps — each carries its math. The app packs all of it: Mandrel Bench, offline, everything prints at true size.
SPI to spacing, the thread's diameter, the saddle stitch's length — the irons' real sizes.
🪢The bights and leads, gcd, crossings, and the coding families — knots by arithmetic.
🪝The 4.6× rule for strand width, the lace's 1.7×, and the taper's pairs.
📿The bracelet's length, the handle's cord, gutted or not — measured, honest math.
Long-form, sourced from the app's tested rules — every number carries its source.
Bights × leads, the gcd that picks the cords, the crossings, and the coding families.
Read the guide →The 4.6× strand rule at its honest 43°, the lace's 1.7×, and dropping pairs on plan.
Read the guide →SPI to spacing, the thread's diameter, the thread length that never runs short.
Read the guide →What's here
Calculators, video shelves, guides for the parts that go wrong. All free.
Stitch spacing and thread length, knot arithmetic, bracelet sizing, handle wraps — right in the browser.
Channel-surf the real plaiters, stitchers and knotters as clips pass review.
Guides with their sources — the app's tested rules, written out plain.
One line when a guide or calculator lands. Mail volume: whip-speed — slow and deliberate.
Building with the app? Mandrel Bench works offline, no account.
The bench family
The knot bench sits with the handcrafts: chart the beads, weave the band, ferment the jar, cut it for real.
Patterns for eleven bead crafts — charts at true bead size, shopping lists with codes.
🧶Tablet weaving, inkle, macramé, alphas and rugs — real drafts, plus the DMC spectrum.
🎭The costume workshop: masks, props, LEDs, and the cues that bring them alive.
🫙Ferments, brews, chocolate and dye — every percentage names its base.
🪚Laser cutting and 3D printing — the drying table, the kerf, the machines' math.
🫧The slime site that started the family style — recipes, games, the curriculum.