ehcrea tools.

Engineering calculators for precision design, cooling, tolerances, seals and vacuum.

CALCULATORS

Free calculators for mechanical, thermal and vacuum design. They run in your browser, no install or account needed. Metric or US units and PDF reports.

Precision Engineering Calculators
Flexures, beam theory, Hertz contact, buckling, motion profiles and thermal effects, based on the JPE Precision Point formulas. Live dimensioned sketches, metric or US units, PDF reports, in English, German, Dutch and Turkish.
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Screenshot of the Cold Plate Calculator: plate layout with heat sources and coolant channels

Cold Plate Calculator
Size liquid- and gas-cooled cold plates for power electronics, batteries and fuel cells. Place heat sources, see a 2D temperature map, pressure drop, pump operating point and flow per channel, then export a PDF design report.
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Screenshot of the Tolerance Chain Calculator: 3D assembly view, stack-up table and Monte Carlo distribution

Tolerance Chain Calculator
1D tolerance stack-ups with ISO 286 fits, ISO 2768 general tolerances, play and thermal expansion. Worst case, RSS and Monte Carlo results with pass/fail, Cpk and contribution charts.
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Screenshot of the Vacuum Chamber Calculator: pump-down curve, gas load and chamber settings

Vacuum Chamber Calculator
Design a vacuum chamber and its pumping system: gas load from outgassing, permeation and leaks, line conductance, pump-down time with roughing, Roots and high-vacuum pumps, and wall strength. Metric or US units, PDF reports, in English, German, Dutch, Turkish and Spanish.
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Screenshot of the O-Ring Groove Designer: gland cross-section, compression and groove results

O-Ring Groove Designer
Design and check O-ring grooves for piston, rod, face, dovetail and boss seals with AS568 and ISO 3601 sizes and Parker/ERIKS guidelines. Checks squeeze, gland fill, stretch, extrusion gap and material limits, and suggests the right groove. Metric or inch, in English, German, Dutch, Turkish and Spanish.
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