THE MECHANICAL ENGINEER’S WORKBENCH
Make the calculation.
Understand the result.
Practical tools for tolerances, pressure equipment and bolted joints. Keep the inputs, assumptions and engineering reasoning in view.
A small gap. A clear answer.
One envelope. Two components. Worst-case fit.
g = Envelope − A − B
g min = 49.90 − 30.05 − 19.55 = 0.30 mm
Find a calculator, reference or worked example.
START WITH THE PROBLEM
Tools for the work in front of you.
FIT & ASSEMBLY
Tolerance stackup
Understand the gap. Check worst-case limits, RSS and the dimensions that drive assembly fit.
Open calculatorPRESSURE DESIGN
Pipe & tubing pressure
Check B31.3 wall thickness, bend requirements and the assumptions behind the result.
Open calculatorBOLTED JOINTS
Bolt torque & preload
Explore torque, pretension, preload scatter and retained clamping force.
Open calculatorMATERIAL & FABRICATION
Section weight
Calculate mass from a standard section, your own profile or a closed DXF cross-section.
Open calculatorAlso available: steel section tables, land measurement and planning tools.
EXPERIENCE BEHIND THE TOOLS
Nine years in subsea.
A practical eye for design.
I’m Ashish Kapoor, a mechanical design engineer with experience in subsea pipeline connectors, umbilical termination assemblies and flying leads. EnggTools brings my interest in calculations and technical problem solving into useful engineering workflows.
THE REASONING MATTERS
Go beyond the number.
Section Weight Calculator Math: From Profile Area and Density to Mass
Learn how solid, hollow, built-up, custom, and DXF profile areas become kg/m, lb/ft, and total member mass, with formulas, unit checks, and a worked steel RHS example.
Read the explanation1D Linear Tolerance Stackup: Will the Parts Fit in the Envelope?
Will the parts always fit in the envelope? Worst-case and RSS methods for 1D chains, with the sign conventions that prevent the most common stackup errors.
Read the explanationDatum Shift and Bonus Tolerance: How Much Positional Budget Do You Really Have?
A 0.02 position callout at MMC can really give you 0.05. How stated tolerance, bonus, and datum shift add up - and when not to trust the sum.
Read the explanation