A suite of thirteen interactive sizing and analysis tools spanning drivetrain, structural, thermal/fluids, and electrical design. Each runs entirely in your browser — enter your numbers, watch the verdict and the curve update live, and see not just the answer but why it holds. Built by the engineer, held to the five-nines standard.
Size a servo motor and gearbox from load dynamics — reflected inertia, a multi-segment duty cycle for true RMS torque, gravity loads, and a torque–speed operating-point overlay.
Reflected inertia · RMS & peak torque · gear ratioDesign an open belt or chain drive — belt length, wrap angle, belt speed, shaft tensions, and belt count, checked against a service factor and drawn to scale.
Wrap angle · tension ratio · scaled diagramSize a transmission shaft by the ASME method — minimum diameter for strength and stiffness, keyway shear and bearing, with a stress-versus-diameter plot showing which governs.
ASME equivalent torque · strength vs stiffness · keywayPredict rolling-bearing fatigue life per ISO 281 — equivalent dynamic load, L10 in hours, reliability-adjusted life, and a load–life curve showing how sharply life falls with load.
ISO 281 L10 · load–life curve · required ratingAnalyse a simply-supported or cantilever beam under any mix of loads — reactions, shear and moment diagrams, deflected shape, bending stress, and span/deflection, solved numerically.
Shear/moment/deflection · any load layout · yield checkCheck a compression member against buckling — Euler for slender columns, Johnson for stocky ones, with the transition and your operating point on the critical-stress curve.
Euler–Johnson · slenderness · end-condition factorDesign a preloaded bolted joint — proof-based preload, the stiffness split that decides how little external load reaches the bolt, torque, and checks against yield, separation, and slip.
Preload & torque · joint stiffness split · separationSize a fillet weld group — effective throat, direct and torsional shear combined vectorially at the worst corner, required leg size, with a plan view of the governing stress.
Throat shear · vector stress · weld-group diagramSize a piping run and find where a pump really operates — friction and fitting losses by Darcy–Weisbach, the system curve, and its crossover with the pump curve that sets true flow and head.
Darcy–Weisbach · operating point · velocity checkMatch a fan to a duct system — the system resistance curve, its crossover with the fan curve, the best-efficiency window, and the fan laws for speed and air-density changes.
System curve · duty point · fan laws · BEP windowKeep a power semiconductor alive — trace heat from junction through case, interface, and heat sink to ambient, find the junction temp or the sink you need, and see the margin on a live thermal ladder.
Junction temp · thermal resistance path · sink sizingSize the supply that feeds a motor — full-load and starting current for an AC/VFD drive with real power factor and efficiency, or DC battery runtime with Peukert derating and depth-of-discharge.
3-phase current · VFD & power factor · battery runtimeSize a conductor for both limits — ampacity so it won't overheat and voltage drop so the load gets its volts. Scans every AWG or mm² gauge and marks the smallest that passes.
Ampacity + voltage drop · gauge table · Cu vs AlTune a control loop by feel — drag the three gains and watch the step response settle, oscillate, or run away in real time, with rise time, overshoot, and settling updating live.
Live step response · drag-to-tune · windup & dead timeBuild a fabrication quote from an editable material price table you control — material weight and cost, labor, overhead, drop waste, and markup — then generate a clean customer proposal and an internal cost sheet side by side.
Editable price table · labor + markup + waste · proposal & cost sheetTurn a cutting job or a weld into real hours and dollars — machining time from feeds and speeds, welding time from deposition rate and operating factor — with the bottom line ready to drop into a proposal.
Machining + welding time · non-cut reality · feeds the quoteStack a chain of dimensions and see whether the assembly fits — the guaranteed worst-case range and the statistical RSS range side by side, checked against spec limits with the biggest contributor called out.
Worst-case + RSS · spec limit check · Cpk predictionTurn an ISO 286 fit callout like H7/g6 into real hole and shaft limits, the clearance or interference range, and the fit type — with the tolerance zones drawn to scale so you see the gap or overlap.
ISO 286 limits · clearance / interference · zone diagramThe conversions engineers actually reach for — torque, pressure, flow, power and more — with the awkward cross-system ones (N·m ⇄ lb·ft, CFM ⇄ m³/h, psi ⇄ bar) done with exact factors.
15 categories · exact factors · all-units tableThe tools share a common language, and each one's output feeds the next — so you can size a whole machine axis start to finish.
Use entirely at your own risk. The calculators and tools on this page (the “Tools”) are provided for general educational and preliminary design purposes only. They produce approximate, idealized estimates based on simplified engineering models and the values you enter. They are not engineering advice and are not a substitute for the judgment of a qualified, licensed professional engineer.
No warranty. The Tools are provided “as is” and “as available,” without warranty of any kind, express or implied, including but not limited to warranties of accuracy, completeness, merchantability, fitness for a particular purpose, or non-infringement. Five Nines Mechatronics LLC does not warrant that the Tools are error-free, that results are correct, or that they are suitable for any particular application.
No liability. To the fullest extent permitted by law, Five Nines Mechatronics LLC and its owner shall not be liable for any direct, indirect, incidental, special, consequential, or punitive damages, or for any loss, injury, cost, or damage of any kind — including property damage, personal injury, business loss, or equipment failure — arising out of or in connection with the use of, or reliance on, the Tools or their results, whether based in contract, tort, negligence, strict liability, or otherwise, even if advised of the possibility of such damages.
Independent verification required. Any result from these Tools must be independently checked and validated by a qualified engineer against the governing codes, standards, and manufacturer data (e.g., AWS, AISC, NEC, IEC, ISO, ASME, Eurocode, and relevant manufacturer specifications) and confirmed by appropriate analysis and testing before being used in any real design, fabrication, construction, procurement, or operational decision. Nothing here constitutes a stamped or certified engineering deliverable.
Assumption of risk. By using these Tools you acknowledge that you have read this disclaimer, that you use the Tools voluntarily and at your sole risk, and that you assume full responsibility for any outcome resulting from their use.