Reading RPM's from hinge.

[JackPL]

How can i make it?

Must work in Phun too! (2 methods [for phun and other for algodoo] will be akcepted)

Thanks a lot!

Sorry for my bad eng.

[Mystery]

You can't read from the hinge but instead the object attached to the hinge. In information Angular Velocity is how many rotations per minute.

[Kilinich]

1) Just pick K-Probe (available for phun and algodoo)
2) Build such probe for yourself (laser or collision based), measure rpm from e.normal change
3) Use app.step/app.undo method of reading hidden variables