Measuring Pinion and Crown wheel

Hello.
I am trying to measure some pinon and crown wheel with SPIRBV.  
Then I'm measuring the topography whit points everything works great but it takes a lot of time.

When I try to scan instead the probe takes points in the air, I can se it whit my eye and the result is very bad.
I can´t figure out what I´m doing wrong.

Any suggestions on what I should do are welcome.

Also trying to create a CAD model of the gear with CadCreateSpirbv but do not know what should be entered under "Queue whit tooth profile section name".

Regards Anders.