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I have read a couple of articles where it advises to validate the FEA results by creating a finer and finer mesh to see if the stress increases. However, those articles didn't specify the magnitude of a stress increase that would indicate that the stress is "false" (i.e. caused by a...

CCox, No kidding! Definitely not what I expected from this forum but luckily, there are quite a few good engineers on here too.

Dougt115, Thanks for all of the insight, I really appreciate it. I figured that both a distributed load across the booms and a point load at the CG would work but I wasn't sure if one method was more common. But, you explained it very well. Thanks again!

Thanks to all of you who were helpful without being condescending. These forums are suppose to be a tool to learn by asking questions, even if they seem stupid to other people.

dhengr, No, this is not a student problem. There was a debate about which was more accurate: applying the weight of the boom at each boom assembly's CG or applying a distributed load along each boom. This prompted me to go back through some textbooks but I hadn't seen an example where it...

rb1957, This is an arbitrary FBD. My REAL question was how to apply the weight of the booms when drawing a shear and moment diagram.

drawoh, Thank you for your reply. I understand what you're saying and how to analyze it, however, the weight of the beam itself is confusing me. Statics and Mechanics of Materials textbooks neglect the weight of the beam in their analysis. The "beam" I'm trying to figure out is the "outer...

I've been curious about drawing a shear and bending moment diagram for the outer boom of a digger I saw online: 1.) How do you draw the shear and bending moment diagram when you no longer assume that the beam is weightless? Based on the image I attached; is it appropriate to use a point load...

Thank you all for your help! Brian- The table in the spec sheet for the motor said that the amp draw at 12V was 132 at 2500lb line pull. Using a ratio, I approximated that the amp draw is 13.2 for 250 lb line pull. I also just found an equation for estimating the duty cycle: duty cycle =...

I'm a mechanical engineer and it's been years since I've worried about electrical engineering so please forgive the ignorance. I'm interested in using a winch driven by an electric motor (Harbor freight item number 61840) with a duty cycle of 5% (45 sec at max rated load of 2500lbs and 14 min...