Built my boom pole today

[tburk49760]

Built it from schtuff I had laying around. Got to use it to move my front blade into the shop so I can modify it to be a rear pull, six way road grader.

 

[Runner]

Looking good! I like the geometry. Now, let's see it lift something.

 

[groundcover]

Nice job ! Is that a Howard tiller behind the BX ?:thumbsup:

 

[weedpharma]

Looks good and strong. When I posted picture of mine, it was pointed out that I had made an engineering error the same as you have. For the education of others, I will repeat it here.

The lower brace should be below the upper brace riser. The reason being that the force (in the current arrangement) transfered from the upper brace is not transfered to the lower brace but actually gives a force to bend the pole as the lower brace becomes a fulcrum.

All this said, I have not changed mine and is has had no problems. This is simply to tell others the way it should be done.

Weedpharma

 

[easygo]

The lower brace should be below the upper brace riser.

Weedpharma

He is right. But! It really only matters if your lift capacity far exceeds the load bearing capacity of the material you used for the boom. It would take some real "numbers person" to figure that out. Right now the week point in the boom is directly above the lower brace and the upper brace does not help nearly as much as it could had you lined them up.

It's junk just send it to me and I will dispose of of it for you. :licking::drool:

 

[LD1]

He is right. But! It really only matters if your lift capacity far exceeds the load bearing capacity of the material you used for the boom. It would take some real "numbers person" to figure that out. Right now the week point in the boom is directly above the lower brace and the upper brace does not help nearly as much as it could had you lined them up.

It's junk just send it to me and I will dispose of of it for you. :licking::drool:

For a BX24, I doubt you will ever hurt that boom pole.

Looks nice, just remember to use pleanty of ballast. It doesnt take much weight up there for things to get tippy:confused2:

 

[Esiquil Lara]

Hi friends,

Me too building a boom pole. I plan on welding the horizontal portion to what I refer to as the "upright support". The upright support is the vertical portion that is between the 2 lift arm pins and connects at the top to the top link.

What is a good angle between the 2 pieces? If it's 90 degrees, the pole would be horizontal. If it's 135 degrees, the pole would point up at a 45 degree angle. The top link can be shortened/extended to change the angle of the pole, but what would be a good general angle to have the 2 pieces welded together?

Thank you everyone, I really appreciate any help or suggestion.
- Esiquil Lara.

 

[beenthere]

Other than the brace problem mentioned (and agree the tractor won't cause it to happen) is a chance for it to lay to one side or the other. With a load at the tip of the boom and some swaying forces, I can see a need for some angle bracing to ends of the angle iron on the bucket edge. Won't take much of a strap tacked on there to ensure the tractor goes before the load goes.

Tipping the tractor would be important to always be aware of when carrying a load (or lifting a load very high with the rear wheels on even a slight slope).

 

[evo803]

Nice looking build I am sure that will be very handy.

Could someone explain or point me to the other threads that explain in detail why that lower brace should line up under the upper truss brace ?

 

[Sublifer]

Looks nice. I wouldn't have thought of doing a boom pole from the bucket. Lift capacity is probably similar to the 3PH but you can lift higher. With a shorter boom pole you could lift even more. But then I guess you built it that long so you could lift and set things further from the tractor. Be interesting to see an adjustable one.

 

[Sublifer]

Nice looking build I am sure that will be very handy.

Could someone explain or point me to the other threads that explain in detail why that lower brace should line up under the upper truss brace ?

Its physics... If the main pole is stressed to the point of bending then the upper brace takes some of that pressure. As it the weight pulls it down, that force is going to be sent down that middle support. Since the bottom brace is not there then that force would be a direct downward force to the main beam again and the next weak point would be at the end of the bottom brace and is where it would bend. Clear as mud? If you really wanted to visualize it you could mock it up with something flexible and see where it bends as you adjust supports

 

[beenthere]

Nice looking build I am sure that will be very handy.

Could someone explain or point me to the other threads that explain in detail why that lower brace should line up under the upper truss brace ?

Has to do with bending moments. Where it is located now has a weakening effect on the structure.

 

[bcp]

Lifting too much:

 

[tburk49760]

Thanks for the positive words and the input as well, I feel kinda dumb for not thinking of the brace positioning. The main beam is an old trailer axle and is very thick and heavy so the upper truss is mostly for looks? I intend to use it only when the hoe is on for ballast and mostly keeping the tip at or below the level of the bucket to minimize the chance of tipping. Already used it to move my hydraulic blade into the shop and am very pleased with it's usefulness.

 

[tburk49760]

And yes that is a Howard Rotovator with the English motor lurking in the background. Runs well, weighs a lot.

 

[evo803]

Its physics... If the main pole is stressed to the point of bending then the upper brace takes some of that pressure. As it the weight pulls it down, that force is going to be sent down that middle support. Since the bottom brace is not there then that force would be a direct downward force to the main beam again and the next weak point would be at the end of the bottom brace and is where it would bend. Clear as mud? If you really wanted to visualize it you could mock it up with something flexible and see where it bends as you adjust supports

If the beam is going to buckle at that point where the truss support post is why would adding more stress to that area from the brace below help it from failing ? The beam is trying to bend which pushes upwards and the truss is supposed to resist that force , so if that upward force is increased by having the main support post at that area wouldnt that just add more stress to the truss and cause it to fail anyway ?

Thanks everyone for trying to help I am just trying to wrap my mind around this .

 

[Iplayfarmer]

If the beam is going to buckle at that point where the truss support post is why would adding more stress to that area from the brace below help it from failing ? The beam is trying to bend which pushes upwards and the truss is supposed to resist that force , so if that upward force is increased by having the main support post at that area wouldnt that just add more stress to the truss and cause it to fail anyway ?

Thanks everyone for trying to help I am just trying to wrap my mind around this .

The beam is going to buckle where the brace from underneath meets the beam. This is where the opposing forces are all greatest. Putting the truss support directly above this point sandwiches that point so that the truss support above pushes down to help counter the force of the brace pushing up.

 

[trook]

I guess I'm a little slow. Can someone insert a diagram of the proper way to add the supports?

 

[Iplayfarmer]

I guess I'm a little slow. Can someone insert a diagram of the proper way to add the supports?

Here's my proposal...

 

[evo803]

The beam is going to buckle where the brace from underneath meets the beam. This is where the opposing forces are all greatest. Putting the truss support directly above this point sandwiches that point so that the truss support above pushes down to help counter the force of the brace pushing up.

By doing this aren't you adding more total forces to this area therefore making it the weak point ?