First cell calculates T(t), N(t), B(t) for all t in the range. If r(t) is complicated the results may be messy to a point 
of being useless. Try //N - numerical values instead. 

Second cell calculates and displays TNB frame at a specified point  t. 

Third cell graphs TNB frames for  n  equally spaced along the curve points to show us the dynamics.
Make sure you run it twice to compile correctly.