โ๏ธ Mechanical & Manufacturing
Free mechanical engineering calculators: lathe and milling operations, gear pump sizing and strength, metal weight, pipe friction loss and V-belt lengths.
Shop-floor math without the handbook: lathe and milling operations, gear pump sizing and strength checks, V-belt lengths for pulley pairs.
Metal weight estimates cover common profiles and alloys for cost and handling; pipe friction loss follows the Darcy approach with Reynolds number computed alongside.
Gear Pump Size Calculator
Size a gear pump from displacement and speed, or find the displacement needed for a target flow. Enter volumetric efficiency for realistic results.
Gear Strength Calculator
Check gear tooth strength with the Lewis bending stress formula. Enter transmitted load, face width, module and form factor for the safety margin.
Lathe Operations Calculator
Calculate lathe spindle speed from cutting speed and workpiece diameter. Get feed rate, material removal rate and machining time for turning operations.
Metal Weight Calculator
Calculate the weight of metal bars, pipes, plates and squares from dimensions and material density. Supports metric and imperial units with a built-in density table.
Milling Operations Calculator
Calculate spindle speed and feed rate for milling operations. Enter cutter diameter, number of teeth and material to get RPM, feed and machining time.
Pipe Friction Loss Calculator
Calculate head loss due to friction in pipes with the Darcy-Weisbach equation. Pick a material for the roughness factor, enter flow velocity and pipe size.
Reynolds Number Calculator
Calculate Reynolds number (Re = ฯvD/ฮผ) to determine if fluid flow is laminar, transitional, or turbulent. Enter density, velocity, diameter, and viscosity for instant classification.
V-Belt Length Calculator
Find the required V-belt length between two pulleys, or the center distance for a given belt. Enter pulley diameters and centers for an instant answer.
Frequently asked questions
Which machining operations are supported?
Turning, facing, drilling and milling fundamentals: speeds, feeds, cut times and power, with material groups to pick from.
How is metal weight estimated?
Profile area or dimensions times length times alloy density; the page lists the densities applied so you can substitute your own.
What does the pipe friction tool compute?
Pressure loss along a run from diameter, flow, length and roughness โ Reynolds number first, then friction factor, so the regime is visible.