FREE ONLINE TOOLS

Quick gear calculations without installing anything

Three focused calculators for everyday checks. They run entirely in your browser and need no account. The current interface is in Chinese; the input labels are listed below in English so they are straightforward to use.

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Available calculators

Open a tool, enter the values, read the result.

Gear geometry

Open calculator →
Module (模数), teeth (齿数), pressure angle (压力角), profile shift (变位系数), helix angle (螺旋角). Outputs reference / tip / root diameters and base circle.

Measurement over pins

Open calculator →
Span measurement (公法线) and measurement over pins (跨棒距) for inspection planning and tooth-thickness checking.

Planetary gear train

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Sun / ring / planet tooth counts, ratio and assembly conditions for NGW trains.

Note on language

We are rolling out English interfaces.

These tools are currently presented in Chinese as part of our domestic platform. Full English versions are on the roadmap. If a label is unclear, send us a note — we will add an English glossary or run the calculation for you. TJDrive and the engineering service are already available to English-speaking clients.

Need a full parametric design?

TJDrive generates the DWG / PDF / STEP files a workshop needs.

See TJDrive