Hello
I have a problem running multiple rotary motors simultaneously in a rotary arm of 3 degrees of freedom. I've attached a file with the assembly and the motion study. In the motion study, I specified when motors should start and end, however, at certain points when I want two motors running, the next motor starts when it should but the previous motor stops immediately. I'm able to run multiple linear motors simultaneously so i'm not sure whether its because I specified my mates incorrectly or some other error.
-Jack Poon
Jack,
You need to define the reference component on the motors so that it is with respect to the previous part of the robotic arm the part you are rotating is connected to. By default it assumes the movement is with respect to ground, so when you start rotating the arm around the motor orientation doesn't change from the starting position and causes a lockup.
You can have the same issue with linear actuators as well, such as the hydraulic cylinder on a scissors lift or dump truck.
Cheers,
Ian