I gave an equation (expression) as follows to a torque value.

"66*IF((600-{Angular Velocity1}):-1,0,1)*ABS(step((600-{Angular Velocity1}),-10,1,10,-1))"

What is the unit of 66? Is it N-mm or N-m?

When I selected the option constant I get N-mm.

Why I got this doubt is, in API we enter all the units in meters....

The function expression feild as of SW 2009 supports the dispaly units. So just be careful of the angular velocity units to ensure thay correlates to your desired RPM (I assume you are saying 600 deg/sec below right?).

Is your angular velocity measure about a certain axis, not magnitude? That is very important.

You may have to put a negative sign in front of the torque depending on your sign convention for the applied torque vs the velocity sign convention.

cheers,

Ian