Engineering Tools

A small, curated set of manufacturing engineering calculators.

• Sheet Metal Bend Allowance Calculator — Bend allowance, bend deduction, and minimum bend radius for a press-brake air bend.
• Ball End Mill Cusp Height Calculator — Scallop height and approximate surface roughness left between adjacent ball-nose finishing passes.
• Cantilever Beam Natural Frequency Calculator — Natural bending frequencies of a fixed-free beam for the first three transverse vibration modes.
• WBGT Heat Stress Index Calculator — Wet Bulb Globe Temperature index from dry-bulb, natural wet-bulb, and globe thermometer readings.
• REBA Ergonomic Risk Assessment — Score whole-body posture, load, and coupling using the REBA method to flag manual-handling tasks that need a closer look.
• NIOSH Lifting Equation Calculator — Recommended Weight Limit and Lifting Index for a manual lifting task, per the 1991 Revised NIOSH Lifting Equation.
• AQL Sampling Plan Calculator — Sample size, accept number, and reject number for an ISO 2859-1 single sampling plan.
• Gage R&R Calculator — Measurement system repeatability and reproducibility from a parts x operators x trials study, AIAG Average-Range method.
• SMT Stencil Aperture Ratio Calculator — Area ratio and aspect ratio for a solder paste stencil aperture, checked against IPC-7525 recommended minimums.