Help with Dynamic Simulation

[Anonymous]

Hi guys,

I'm relatively new to Dynamic Simulation (although I've been using Inventor for years!) and I'm trying to set up an assembly to calculate the force generated by a press. I've attached a screen shot of the set-up. What I'm mainly wanting help in is: 

What joints should I use to create the assembly?

What function should I use to calculate the force exerted by the press?

At the moment, my setup results in a force of about 19N, which, from real-life examples, is about 24,980N shy of what I was expecting!!

Any help would be greatly appreciated.

[Anonymous]

I think admaiora's response was to the issue I had previously. You might want to start a new thread for your issue to keep things clear.

[admaiora]

I am not referring to your post but to the main topic argument.

[Anonymous]

The correct result was 24980N. The bigger value was found when there were no friction coefficients applied to the simulation. Obviously, in reality there would be friction in the motion, so we added friction coefficients and the resultant force was drastically reduced.

[admaiora]

Did you get near to the theoric resulst adding frictions?

10x N  can be justified only in friction in this case? Wow!

[Anonymous]

In this case yes the friction coefficients made a huge difference, due to the way the force is exerted.

[admaiora]

Nice job so!

What result did you get with friction?

And what friction value did you use? 0.35 and its radious?

[Anonymous]

I can't remember the exact figures but the result was about 25500N and we used a range of friction values for different joints, between 0.25 and 0.4.

[admaiora]

Thank you Tim!

[admaiora]

Just the last curiosity, what the press was for?

[Anonymous]

Not sure, to be honest. A customer of mine was working on the design and needed help on the simulation side.

[Anonymous]

Good day

I noticed this discussion is almost identical in addressing what I'm struggling with solving. I am trying to determine the force required to drive a load of given magnitude. the rod is the one being used to drive this load, the force being applied is done so via the crank and it is this force I wish to determine. I tried using the unknown force option but I got a message saying the point where I'm applying this force is over constrained.

I've added an image below of the assembly I'm working with, I would highly appreciate your help.

Regards

Tk

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