Hi guys, if i mount a dc motor on a glider that slides in 2 directions without friction, AND, instead of having it drive a mechanism, have a circular plate with an eccentrically drilled hole in it (not centre) mounted on the motor shaft though this hole, i should observe the glider sliding back and forth in a frequency, shouldnt i? In a vibrational manner? Ok, so im going to apply this to my final year project as an experiment which can be conducted by students, and the students can attach circular plates of different mass, to figure out the vibrations that it causes! The distance that the glider travels back and forth will be experimentally measured with a keyence laser i will mount one the end of the airtrack, but the students will also have to theoretically calculate the vibrations too. to clarify,its my final year mech eng project to create an airtrack for various experiments to be carried out on. can you guys point me in the right direction in terms of equations to explain this? I need show the theory behind this obviously and calculate it myself to put in my report. i shall select a motor tomorrow, and post the specs to aid our calulations here. bed time right now! any help appreciated.