Mechanisms in motion
See how crank length, link length and speed change motion. Compare positions and velocity curves; set a target stroke to estimate dimensions.
Slider–crank · toggle · planetary gearsOpens in English →Free engineering tools and unit converter
Convert engineering units here, then choose a calculator, a material comparison or a moving mechanism. No account is needed.
This page and its converter are in English. Linked tools are available in Japanese and English; other language entrances explain where to start.
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Result
Enter a finite number. Absolute temperature cannot be below 0 K.
Open this converter →More units and definitions → (Opens in English)The converter uses fixed unit definitions. Temperature uses an offset; all other categories use a scale factor. Standard gravity for kgf is 9.80665 m/s². Values stay in your browser.
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Beam deflection and stress
Choose the supports and load diagram first. Then enter the span, section and material. Read deflection and stress separately.
Length in mm · load in N · modulus in MPaOpens in English →Open a CAD file without CAD software
Open a supported STL, STEP, DXF or PDF in your browser. Viewer processing stays on your device; supported formats have file-size limits.
STL units may need confirmation from the original model.Opens in English →Compare engineering materials
Compare density, stiffness and strength. For calculations, select the product condition, temper and thickness when available.
A5052 · S45C · ABS · acrylic · woodOpens in English →Motor speed and transmission
Estimate gear speed ratio, torque and belt transmission. Check the actual component rating separately from the calculated requirement.
20-tooth driver + 40-tooth driven gear → half the speedOpens in English →Explore physical quantities visually
Compare values with moving diagrams. Check the model conditions and playback speed before interpreting the movement.
Viscosity · pressure · springs · inclinationOpens in English →Three checks before using an answer
- Match the diagram to the real support, load direction and mechanism.
- Set the unit beside every input. A unit conversion does not change gauge pressure into absolute pressure.
- Compare the result with the actual product limit. A calculated number alone is not a safety approval.
| Pressure | 1 MPa = 10 bar |
|---|---|
| Length | 1 in = 25.4 mm |
| Mass | 1 lb = 0.45359237 kg |
| Force | 1 kgf = 9.80665 N |
| Torque | 1 N·m = 1000 N·mm |
| Temperature | 20 °C = 68 °F |
| Rotational speed | 60 rpm = 2π rad/s |
| Dynamic viscosity | 1000 mPa·s = 1 Pa·s |