3 Point hitch upper link

[MoArk Willy]

I am so happy I started this thread.
And I now know the correct answers contain the following words:
"Maybe, depends, and could be".
And "PTSG" had the best possible answer for determining the answer based on any given load......measure it.

 

[CalG]

"If you can't explain it to a six year old then you don't understand it yourself"
Albert Einstein.

It's a challenge

Ask the right questions, the answer will appear on it's own.

 

[CalG]

I am so happy I started this thread.
And I now know the correct answers contain the following words:
"Maybe, depends, and could be".
And "PTSG" had the best possible answer for determining the answer based on any given load......measure it.

It is very easy to sift out the MEs from the BS es on these sort of topics.

Perhaps we have all been deluded, and that gravity is just a figment of our imagination. And that vector forces are just too much talky talk.

I've got an old pair of ELAN snow skis,

Model designation is "MV^2"

They still work!

Accelerations!

 

[CalG]

.
In the first example, the top link will be exerting force in both the x and y direction, and in actuallity some, albeit smaller force, in the z direction. In this example the top link would be in compression to provide those forces.

In the typical configuration with the top link positioned above the lower lifting arms, the link would be in tension to provide the forces in the x, y, and z direction. Call it lifting, pushing, resisting the moment, whatever. It still exerts a force in those directions.

In the second example above, clearly the top link is not needed since, being in “perfect” balance there is no force in those 3 directions.

But in reality, if you were to use the lower arms to actually lift, it would no longer be in perfect balance. Since the lower arms rotate on a pivot point there would be some movement either toward the rear or front direction and it’s going to fall over without the restraint provided by the top link.

Could you estimate the magnitude of the top link restraining force in the second example?

Is it in grams? or ounces?

Or "Depends on the lift arm speed of motion?"

 

[MoArk Willy]

I hope that nobody thinks my comment was sarcastic....it wasn't meant to be.
I think that the original diagram posted by TerryR is a culmination of applied knowledge to a specific set of variables.
But in my humble opinion they are not representative of real life applications, just an example of how forces are determined.
For it to be correct....the weight distribution would have to be exactly as illustrated..
In reality, and in these circumstances very few implements would have the balance or load points as the illustration suggests.
There are some variables that cannot be calculated, just measured and documented.

 

[CalG]

There are no variables that can not be determined. But what is it worth?

I'm always happy with "order of magnitude" assessments.

If I'm off by a factor of ten, I blame the slide rule!

 

[MoArk Willy]

I think I said that.......about the variables......without actual measurements it's just guessing.
But prior to physical examination the rest is theory.

 

[CalG]

I think I said that.......about the variables......without actual measurements it's just guessing.
But prior to physical examination the rest is theory.

Your definition of theory differs from mine.

10 meters per second/second is NOT theoretical.

Newton Meters are NOT theoretical.

 

[MoArk Willy]

Apples and oranges.

 

[MoArk Willy]

As I was going to St. Ives,
I met a man with seven wives,
Each wife had seven sacks,
Each sack had seven cats,
Each cat had seven kits:
Kits, cats, sacks, and wives,
How many were there going to St. Ives?