Tools
STI Sinusoidal Vibration Calculator
https://www.stiweb.com/Vibration_Calculator_s/104.htm
BTI ISO Balance Calculator
https://balancetechnology.com/calculators/calc_iso.php
Balancing Polar Graph Paper
Polar Paper CW Rotation
Polar Paper CCW Rotation
Incompetech Online Polar Graph Paper
http://incompetech.com/graphpaper/
Falstad Fourier Series Applet
http://www.falstad.com/fourier/