Making a backblade

[tatra805]

Started with my backblade

The blade itself comes from some non complete front mount blade i found together with the tillers i bought last weekend.
Matches the width of the iseki perfectly.

I already sourced a pivot point from some dismantled assembling robot. That with the angle setting plates of the front mount blade give me the possibility to have both the beam and the blade to be settable.

The beam is +30/-30 settable which moves the center of the blade from in-line with the left backwheel to inline with the right backwheel.

The beam has a tube welded in where the pivot pin runs through, the plates are all 10mm thickness so i hope and expect things to be beefy enough to handle the pull forces.

I used the other pivot, which rotates 180, as it really is a heavy piece with load bearing pivot pin and needle bearings for the rotating which will handle the stresses from the bottom mounted blade much better. The blade can then be set to any angle using a hydraulic cylinder.

missing picture to follow.

As an extra i build in a rotating point for the blade so it also can be set at an angle or float when a tire hits a pothole or something. I guess this will be the weakest point and therefore used some pressure spreading plates and a longer guiding tube wich have to take the lateral forces (bending) while a M20 rod takes the axial forces (pulling).

To explain a litte: both plates have tubes welded on. On the picture you only see the tube of the right side plate. (biggest piece of tube is tubes to beef it up). The left side plate has a smaller diameter tube which runs inside the smallest tube of the right side plate.
Through this tube a M20 rod runs from the threaded pivot point base plate (20mm thick) to the exit of the tube in tube where it is tightened with the nut you see in the picture.

I will not have the possibility to push backwards with the blade but consider it a lesser issue as i still have the fell bucket to push things forward.

I'll update as things progress. still a couple of evenings to finish the construction.
tell me what you think, all input appreciated

 

[bobodu]

"dismantled assembling robot"

Wow...that sounds really sad.....


Nice Job!!

 

[tatra805]

Bobodu, that's what happens with them when they go on strike for a 38 hour workweek...


A couple more pictures

Top view of blade pivot head (the robot part, center axe not connected, so parts are under an angle)

The central beam is 4x4 (10x10cm) so you get an idea about the dimesions of this "hinge".

Side view of blade pivot head (and the blade rotation plates tube-in tube thing)

Overview of the blade end

Complete overview of the lower end ( top link connection still to be made)

Last a picture of the pivot head holding the load bearing axle/pin in front of it.

As you can see the vertical forces are routed to the bushing at the bottom of the axle. ( this is a bushing not the axle which has a bigger diameter).
The top and bottom part of the white rotating part (middle part) are needle bearings contacting the axle taking care about the rotation while the middle block and the top and bottom blocks are taking the horizontal forces.

 

[tatra805]

First time on the tractor.

Blade starts to be heavy. And with the fel and blade in longest positions the whole setup is nearly 7 meters long..

in full offset:

blade side:

3pt side:

rear view in transport position:

Still a toplink from beam to 3pt frame and figuring out how to put the hydraulics on it and it is ready for a testdrive.

 

[tatra805]

The testdrive was done, worked a charm and so much better results compared to the FEL bucket.

Used it to "distribute" ground, level the paddock and spread manure.

On the manure spreading the results were quite surprising. Load a bucket of manure dump it and then push it backwards with the backblade set at 1 inch from the ground. You get a quite even spread and flattened out patch layer of manure.

No pics at the moment.


So all perfect till i hit a hidden stump and tore the hydraulic cylinder from its swivel heads..

No big issue there but again a couple of hours work to invest in repair.

Another issue i found was that when working with the main beam offset the blade tends to dig in with 1 corner. The gauge wheels prevent this when leveling out an area but when you want to scrape a layer the blade still tilts.

The good news is that the swivel point works i just have to find out a way how to brake it. Second hydraulic control is a possibility but for the limited use i have for the blade i might just go for a mechanical solution.

I'll post some pictures later on.