Setting up FBDs for Frames & Machines: Tips & Tricks

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sms22
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Hi everyone,
I did a search and couldn't find any useful information on frames and machines for statics (unless I missed it for which I apologize if I did)
Does anyone have a few steps that they follow when setting up a FBD of a frame/machine. I'm having trouble being able to efficiently set up diagrams. Sometimes I end up making more than are necessary and making it harder when there is a simpler solution. Curious if anyone has a little tip on setting it up. any advice is appreciated.
 
on Phys.org
Another name would be truss analysis (instead of 'frames'). Use this as a keyword to extend your search.

Truss analysis is typically box standard. Are you aware of the Method Of Sections?

Also, I'm not really sure what you mean by 'machines'. Four-bar linkages and that sort of thing?