Workshop Safety & Algorithmic Liability Disclaimer

1.1 High-Energy Machinery Hazards: Cutting operations planned with Opifico typically involve industrial and workshop power equipment, including table saws, sliding table panel saws, vertical panel saws, radial arm saws, compound miter saws, band saws, cold cut metal saws, thickness planers, jointers, shapers, spindle moulders, high-speed CNC routers, laser cutting machines, plasma tables, and industrial shears.

1.2 Bodily Injury & Mortality Risks: High-velocity rotating blades, router bits, and cutterheads operate at speeds typically between 3,000 and 24,000 revolutions per minute (RPM). Mechanical contact with spinning cutters or high-velocity projectile ejection of offcuts carries imminent, severe risks of:

• Traumatic limb, digit, or hand amputation;
• Severe deep tissue lacerations, arterial trauma, and crushing injury;
• Penetrating eye trauma and permanent blindness from projectile wood splinters or blade tooth ejection;
• Blunt force trauma and fatal physical injuries caused by workpiece kickback.

1.3 Software Role & Limitation: Opifico is purely a computational geometry utility. It does not control machine feed speeds, does not monitor blade clearance, does not install machine guards, and does not assess workshop conditions. Use of the software does not diminish the lethal mechanical risks inherent in operating fabrication machinery.

2.1 Abstract Mathematical Models: Cutting plans, nested sheet layouts, and offcut diagrams generated by Opifico represent idealized mathematical 1D and 2D bin-packing solutions based strictly on numerical dimensions entered by the user. Real-world raw timber and sheet stock deviate substantially from theoretical Cartesian geometry.

2.2 Inability to Inspect Physical Stock: Opifico software possesses no optical sensors, acoustic probes, or mechanical inspection capabilities. The software DOES NOT and CANNOT inspect, detect, or account for:

• Internal Growth Tension & Case Hardening: Drying stresses and reactionary wood (tension wood in deciduous hardwoods, compression wood in conifers). Severing internal tension during a longitudinal rip cut can cause the board to suddenly pinch closed upon the saw blade or violently warp against the rip fence.
• Structural Timber Defects: Dead, loose, or encaptured knots; pitch pockets; radial checks; ring shake; heart rot; dry rot; insect channels; and grain runout. Defective timber can shatter violently upon cutterhead impact.
• Moisture-Induced Dimensional Distortion: Board warpage, including cupping across the face, crowning or bowing along the edge, crook, wind, twist, diamonding, or localized thickness variances.
• Engineered Board & Metallic Inclusions: Voids in plywood cores, glue pockets, embedded metal staples, nails, mineral streaks, case-hardened alloy skins, or residual rolling stresses in sheet metals.

3.1 The Myth of Nominal Kerf: The true physical width of a saw cut (the kerf) is never identical to the nominal tooth width stamped on the saw blade. True kerf in an operating machine deviates dynamically due to multiple mechanical and thermal variables:

• Tooth Geometry & Grind: Differences between Alternate Top Bevel (ATB), High-ATB, Triple Chip Grind (TCG), Flat Top Grind (FTG), and combination rakers;
• Tooth Set & Resharpening Variance: Lateral tooth offset and radial runout introduced during saw blade re-tipping or sharpening;
• Arbor Deflection & Runout: Spindle runout, bearing play, arbor flange misalignment, and collar contamination;
• Saw Plate Deflection: Lateral flexing, blade flutter, and blade vibration induced by feed speed pressure against dense hardwoods or sheet stacks;
• Thermal Expansion: Frictional heat accumulating in the saw plate rim during continuous ripping, causing rim dishing and kerf enlargement.

4.1 The Mechanism of Kickback: Table saw kickback occurs when a workpiece pinches the rising teeth on the rear of a rotating blade or binds between the blade and the rip fence. The spinning blade instantly seizes the workpiece and catapults it toward the operator at speeds exceeding 100 miles per hour (160 km/h), frequently drawing the operator’s hands directly into the spinning blade.

4.2 Yield Optimization vs. Safe Machining Practice: THE ORDER AND ORIENTATION OF CUTS DISPLAYED IN OPIFICO PATTERNS REPRESENT AN ALGORITHMIC MATERIAL YIELD OPTIMIZATION, NOT A CERTIFIED MACHINING PROCEDURE. An algorithmically optimal cut sequence may be physically unsafe if executed without proper workholding, throat plates, or intermediate stock support.

4.3 Mandatory Operator Safety Duties: The machine operator retains the sole, non-delegable duty to enforce professional workshop safety protocols at all times, including:

• Riving Knives & Splitters: Maintaining an operational riving knife or splitter matched to blade thickness and kerf width to prevent kerf pinch behind the blade;
• Blade Guards & Anti-Kickback Pawls: Employing overhead blade guards and anti-kickback pawls whenever through-cutting;
• Push Devices & Workholding: Utilizing push sticks, 3D downward-force push blocks, featherboards, hold-down clamps, and crosscut sleds;
• Prohibition of Freehand Cuts: NEVER executing a cut freehand without a securely locked rip fence, miter gauge, or guide rail;
• Minimum Stock Length Compliance: NEVER cutting workpieces shorter than the minimum safe clamping length mandated by the machinery manufacturer;
• Regulatory Safety Compliance: Complying with OSHA standards (29 CFR 1910.213), HSE woodworking guidelines (WIS37), and equipment manuals.

5.2 Mandatory Calibration Protocol: Before executing cuts on finished hardwood, expensive plywood, veneered panels, or precision metal stock based on Opifico calculations, the operator must:

1. Measure actual raw stock dimensions using calibrated measuring tapes, precision steel rules, or digital calipers;
2. Cut a test piece from inexpensive scrap material of identical thickness;
3. Measure the kerf loss and resulting test piece dimensions with dial or digital calipers to determine true cut width;
4. Verify fence alignment, arbor squareness (90° blade-to-table), and stop block accuracy;
5. Update the kerf parameter in Opifico if physical measurement reveals a discrepancy with nominal blade specs.

5.3 Assumption of Risk: Commencing production cuts on finished material without preliminary test cuts on sacrificial scrap material constitutes operator error and reckless assumption of material risk.