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Hi I have been learning inventor 2015 for a while now but would like to learn how to start calculating torque in dynamic simulation. I have looked at many different forums and tutorials but cant find anything that shows me what i need to know. What im trying to do is work out the torque needed (from a motor) to spin a disc. I have done a very simple assembly with 2 vertical posts with a disc mounted between them. i want to calculate the torque needed to spin the disc. I want to try different size and weights of disc to see how it effects torque and what size motor would be needed to spin the each disc. Any help or advice appreciated.

Hi Folks, Got an issue with Planetary (internal) gears and dynamic simulation. basically, i have one sun, one planet and one carrier -internal gear. All are designed to move freely. I can get the DS to work fine, providing I dont contstrain the planar top of the sun to anything. This means when apply force in 3d using my mouse, the sun is free to move up and down the z axis - viewing in 2d and applying force in 2d, the mechanism appears to work as intended only becasue its impossible to apply force to the 3rd axis (z) while viewing from this angle. So the obvious solution is to apply a planar mate for the top of the sun, to another part or plane... right??? That's what I thought, however when i do so to restrict the suns movement on the z axis, and return to Dynamic simulation, the suns rotation locks!. Now the sun doesn't move at all and the planet and solar system just revolve around it. Sheesh - I've racked my brains to figure this one out and i'd really appreciate it if someone here could help. I've attached the assembly file for your reference - PS the assembly attached DOES not have the planar mate constraint applied. Moving to DS and viewing from "front" you will be able to see see the motion as intended when applying force (using your mouse) on the sun - notice how all 3 components rotate? Now try viewing in 3d and applying the same(ish) force - you will notice the sun now moves along the z axis. My question : how on earth do i fix this? 6.7mb file - assembly to use is reversing_mechanism2 http://nasora.com.au/test.zip Thanks.