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Home > Forums > Engineering Computer Programs > General Engineering Programs > PTC: Creo Parametric (Pro/ENGINEER) Forum

Mechanism

Read More Threads Like This One

Bunda350 (Mechanical) (OP)

30 Dec 11 17:40

I am doing an analysis using mechanism of a some gears. I noticed that when I control the mechanism with an equation and if I accelerate it to high velocities, that the assembly seems to reverse in direction and spin backwards. Doesn't seem right, but at one point it slows down and you could see it going in the opposite direction. I was using a simple ramp equation (y=a+bt) to control the acceleration. Could it be just an illusion due to the speed? Any ideas what could be causing this?

WolfHR (Mechanical)

30 Dec 11 18:14

You're probably right about it being an optical illusion, samne as wheels spinning backwards in old movies... Here's a link to the explanation: http://www.michaelbach.de/ot/mot_wagonWheel/index.html . HTH

PheasantPlucker (Mechanical)

31 Dec 11 10:19

Try modeling a timing mark on the gear as a visual reference.(See attachment)