Meshing gears 1 and 2, of equal pitch diameter, rotate about axes B and A of frame member a which is rigidly attached to bar 4. Bar 4 reciprocates in guides b-b. Equal masses m are mounted at equal angles ϕ to axis y-y on gears 1 and 2. When gears 1 and 2 rotate at uniform velocity, the force developed along axis y-y of bar 4 is P=2mω²r cos(ϕ), where ω is the angular velocity of gears 1 and 2, and r is the distance from axes A and B of rotation to the centres of mass of weights m. Force P vibrates table 3 and item 7 being tested on the table. Screw device 5 enables the tension of spring 6 to be adjusted.
$2536$LrG,VM$