Another TBH Braintrust ?

[goose48]

My 14 foot winch up feeder has 4 feet from each leg to the center directly under the 55 gallon feed barrel. It is very stable. Each feeder support leg is also anchored through a leg foot hole by a large spike.

[sambo73]

now this would have been a geometry class I would have liked!

[Buck Slayer]

Pi r squared

[Goldeneagle]

22.5 degrees.


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I'd go 30 degrees just to make it easy to figure.

[Buck Slayer]

Newtons 8th motion of law

[donpablo]

Not sure what you mean by stability - i.e. tipping over or the legs buckling.

The former are determined by calculating overturning moments

Tipping over. When you say moments, what do you mean?

4 x's barrel diameter

That’s cool. How/where did you figure that out? It makes me wonder if in the future we could incorporate this problem/question too.

[Goldeneagle]

30 degrees will give you 7ft from center.

[donpablo]

Click here

That’s an awesome build. We’re giving the kids a range so that there will be a few possible solutions. Hopefully this will cut down on groups sharing their work instead of doing it themselves.

[deerplanter]

I've built several and use 14' legs on 22 degrees and have never had one fall that was placed on level ground yet. I use 1-1/2" schedule 40 pipe with 2" pipe on top.

[twosixteens]

Trial and error method

[Graysonhogs]

Pi r squared

no, pi r round

[donpablo]

30 degrees will give you 7ft from center.

The smart ones might figure this out and make the math easier on them.

[StrayDog]

Tipping over. When you say moments, what do you mean?



That’s cool. How/where did you figure that out? It makes me wonder if in the future we could incorporate this problem/question too.

Moments are basically forces times distance - think of using a lever (i.e. cheater pipe) to get a lugnut off a truck tire.

With a same size base making a feeder taller makes it easier to tip over because it’s basically a longer lever.

I suggest you don’t make your problem about tipping over - it’s very little geometry calculation and the students would have to understand how to calculate reaction forces - yuck!

I can sketch a small problem later tonight where the have to choose the size of pipe/square tubing, etc. and angle of the legs to obtain the required height such that simple stresses in the leg aren’t exceeded. This is more of a geometry problem in my opinion.

PM me an email address and I can send you something later tonight.

[Shane]

18", as long as you drive t-posts next to the feeder legs and wire the legs to the t-posts.

[donpablo]

Moments are basically forces times distance - think of using a lever (i.e. cheater pipe) to get a lugnut off a truck tire.

With a same size base making a feeder taller makes it easier to tip over because it’s basically a longer lever.

I suggest you don’t make your problem about tipping over - it’s very little geometry calculation and the students would have to understand how to calculate reaction forces - yuck!

I can sketch a small problem later tonight where the have to choose the size of pipe/square tubing, etc. and angle of the legs to obtain the required height such that simple stresses in the leg aren’t exceeded. This is more of a geometry problem in my opinion.

PM me an email address and I can send you something later tonight.

Will do, thanks.