Grapple project OPEN SOURCE

[ovrszd]

I'm following this thread and I really have enjoyed the mathematical approach. I wish one of my high school math teachers had used a real world example approach to show how math can be used after you pass the test... I think it would have really held the interest of many students. I did fine in math, but I remember thinking how I would never use that in real life!
Now I haven't checked the math for accuracy... Nor have I confirmed that the formulas are proper... But I like the approach!

I also like the approach. Just not able to execute it very well.

In reference to your high school comments. There's a frequent member on here, can't remember his name, who's signature motto is something like this: "Another day that I haven't used Algebra".

 

[Zebrafive]

If anyone has a different brand grapple and would like me to calculate the bite force.....All I need is 4 measurements. Close your grapple lid and give be the 3 dimensions that form the triangle (A,B,and C in my drawings), and then the dimension from the lid hinge to the teeth. And I can calculate assuming a 2" cylinder and 2500psi. See how the geometry of some other grapples compare:laughing:

Where is your drawing for ID of points A B C?
Or please ID points A, B, & C Drawings in this post did NOT have an A, B, or C
By "lid hinge to the teeth" I think you mean point at end of lid. Or straight line length of "lid"
I have a commercial built grapple by RakeMaster I would like you to calculate.
I can also check my cylinder size. My tractor only has 2250psi

 

[Xfaxman]

That's what I should have done. Made my frame mount tab taller and more forward, then used a shorter stouter cylinder. Famous last words!!!

Do you know what the stroke length is on that cylinder?

Edit: Never mind, I checked out your link. They say 10". My pea size brain can't figure out how to make that work on mine. My claws and apron must be shorter than theirs. I'll have to take some more measurements of mine.

Yours looks like it is working pretty good. :thumbsup:

 

[ovrszd]

Where is your drawing for ID of points A B C?
Or please ID points A, B, & C Drawings in this post did NOT have an A, B, or C
By "lid hinge to the teeth" I think you mean point at end of lid. Or straight line length of "lid"
I have a commercial built grapple by RakeMaster I would like you to calculate.
I can also check my cylinder size. My tractor only has 2250psi

Not trying to jump over LD1.

Measurements with claws closed.
A = distance from barrel end of cylinder pin to ram end of cylinder pin
B = distance from hinge pin of claw to ram end cylinder pin
C = distance from hinge pin of claw to barrel end of cylinder pin
D = distance from hinge pin of claw to tip of claw

 

[ovrszd]

Yours looks like it is working pretty good. :thumbsup:

Thank you, yes if works fine. I'm just regretting little things I could have done to make it better. That is if I had retained what I learned in Geometry class.

 

[LD1]

Where is your drawing for ID of points A B C?
Or please ID points A, B, & C Drawings in this post did NOT have an A, B, or C
By "lid hinge to the teeth" I think you mean point at end of lid. Or straight line length of "lid"
I have a commercial built grapple by RakeMaster I would like you to calculate.
I can also check my cylinder size. My tractor only has 2250psi

See post #70

 

[GLyford]

Just remember that bigger diameter cylinders are heavier. And every pound you have at the end of the loader is one less pound you can pick up with the grapple. I would use a flow control valve with a smaller diameter cylinder, if the force at the end of the jaws is still enough to get the job done.

 

[Zebrafive]

Not trying to jump over LD1.

Measurements with claws closed.
A = distance from barrel end of cylinder pin to ram end of cylinder pin
B = distance from hinge pin of claw to ram end cylinder pin
C = distance from hinge pin of claw to barrel end of cylinder pin
D = distance from hinge pin of claw to tip of claw

Thanks!

See post #70

Thanks, picture/drawing was so small I missed it (A, B, C, labels) I will get them plus D and post for your calculations!

 

[Zebrafive]

Here's a couple of pictures of the RakeMaster grapple

 

[ovrszd]

Here's a couple of pictures of the RakeMaster grapple

That thing is very well built!!!! Are your cylinders 2x8?? Anxious to see your "C" measurement. Also would like to see a pic with the claws open if you have one. Thanks!!!!