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Re: Measuring the Lower and Upper Link Points


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Posted by dgoddard on March 09, 2016 at 11:42:11 from (104.245.136.182):

Three of my posts back I mentioned a file that I had created that allows calculation of how the implement will move depending on the length of the upper and lower links and the position of the pivots on the tractor and implement. I have revised it so that it contains some self explanatory information so that how it works can be understood by most anybody.

The file is a spreadsheet that performs the engineering (kinematic) analysis that I offer freely and without copyright. The file size is 141.8 kilobytes (small). It uses techniques I taught to my engineering students but this one is simplified just for tractor rear 3 point hitch calculations The data that you need to enter is all in blue bold numbers. There is a diagram showing where the dimensions are to be taken. And the spreadsheet accommodates two different calculations.

1. The first calculation determines where to put the attachment points on the implement and what length to make the top link so that the implement does not tilt at all as it is raised and lowered.

2. The second calculation determines how much forward or rearward the implement will tilt with the attachment points it has.

Because in the second calculation you can change the inputs you can by trial and error tweak what results you can get from the implement. So If you are not getting the performance you want you can come closer.

For instance,:

Suppose if you want a carry all, that tilts just slightly backward just as it sets down to the ground so its back edge is just a bit lower to make rolling a heavy object on but then as you lift it tilts forward to keep the object from rolling off.

Or another scenario perhaps you want the carry all to sharply tip forward when raised but set flat when on the ground because you are loading firewood and then want it to be secure from rolling off while carrying it away.

As the spreadsheet is set up:

A. I have entered the measurements from my Ford/Shubaru 1510 and it tells me what length to make the top link and where I would have to put the toplink hole for the implement to lift without tilting at all.

B. I have entered the dimensions from my tractor when it is coupled to my King Kutter Rotary tiller and computed how long to make the top link so that when fully engaged at maximum depth into the ground so that the Output and Input (Tractor and implement) PTO shafts will be parallel at that position and it shows a graph indicating the direction and magnitude of angular misalignment imposed on the U-joints at all other positions. (Mine gets as bad as 16 degrees at maximum lift, which is why it shakes like hell in that position). Or if I wish I can make for a compromise adjustment for other positions. (You may need to learn how to use the spreadsheet goal seek feature if you do not want to keep trying guesses.

Because this site allows files with only certain file formats, I do not see how to upload it for you to download. The file is a .xls file (Windows 2000 vintage) which is as primative as I can test with my software, and probably correctly readable by 99+% of the spreadsheet applications available out there.

The spreadsheet will probably be most useful for:

a. designing an implement.

b. adjusting the top link for best PTO performance with out beating the implement or U joints to pieces.

c. Controling implement tilt over the range of lift heights.

So if anyone wants a copy of this spreadsheet (which sould run on most any computing device with a spreadsheet capability) all we have to do is figure out how to send it to you. If there is a Personal Message (PM) capability on this site I have not found it. and It is generally inadvisable to post e-mail address on public forums.


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