I'm in the middle of a machine design that the client wants to be all mechanical. Well, they are allowing a couple of limit switches, but other than that, it's completely mechanical. Three of us here at KETIV are each putting in effort to get this assembly finalized. I am working on the internal mechanism so, of course, I am going to use Inventor. Not soon after I got into some of the details, I realized there were some timing constraints on this assembly that are trivial to solve when a microcontroller is available, but are less obvious when it's completely mechanical. In one revolution of a shaft, I had to have another shaft stop, start, stop, and then start again.
Uh oh. How do you do that? I thought about Geneva Mechanisms and Intermittent gearing. I was sketching on paper for quite a while and then got to the point when it was time to do some solid modeling. The Inventor tool itself was useful to define the contact between the driving "gear" and the driven "gear." It did not, however, offer the kinematic and dynamic information I was seeking.