jinma 6 chipper: Wood Chippers 3PH  -- Tractor Attachments Implements 3ph Discussion Forum and Review jinma 6 chipper: Wood Chippers 3PH -- Tractor Attachments Implements 3ph Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Wood Chippers 3PH Forum

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 05-29-2006, 21:48 Post: 130007
cotton



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 jinma 6 chipper

Has anyone used a Jinma 6" with a 3000 Ford tractor? (or similar size tractor). Is there a problem with alignment of the tractor pto to the chipper ie too steep of an angle? Is the tractor pto too high that would make an angle that would damage either unit especially the tractor pto? Any help would be greatly appreciated.

Cotton






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 05-30-2006, 07:08 Post: 130018
kthompson



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 jinma 6 chipper

Cotton,

I am not familiar with your chipper but some with the Ford 3000. It is hard to believe if you are using a normal pto shaft to connect the chipper and unless you really do something greatly out of line, there would be any problem on the tractor end.

That tractor model has run a many an offset rough cut mower in my part of the world and the shaft runs at a sharp angle on that.

Now, will the bearings on the chipper handle the same angle? I don't know. But, can you not adjust your lift and stablizers to have the pto shaft in a straight alignment?

GD, GB






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 05-31-2006, 22:03 Post: 130165
earthwrks

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 jinma 6 chipper

Ideally a drivesahft with typical cross u-joints should be as straight as possible. Roughly, each end can be out straight alignment by 2 degrees each or 4 degrees total. After about 5 degrees (if memory serves) you start getting an out-of-phase condition where the driven end of the PTO shaft actually alternately speeds up and slows down every one-fourth of the revolution. This is where you start getting chatter too of gears if using a gear box. When I first read this in an engineering handbook, I performed an experiment using a 3/8" ratchet universal and two extenions, and sure enough it's right. Generally speaking, when using only one u-joint it's nearly impossible to cancel the out-of-phase condition. But add a u-joint to the other end, and being careful to index each other by 90 degrees out of index, you'll cancel almost all out-of-phase (OP). Don't index it and you'll magnify (OP) by double. The only way to really cancel OP is use something like constant velocity joint (balls and socket) like what is found on a FWD car.






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 06-01-2006, 14:53 Post: 130225
kthompson



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earthwrks,

Interesting on the "indexing" of the u joints. Are pto shafts designed this way?

I guess drive shafts are for I sure have seen them at more than 5 degrees.






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 06-01-2006, 16:25 Post: 130235
earthwrks

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My guess is that they should be. But in a lot case or applications the go fast slow fast action I talk about may be inperceptible to either the ear or the naked eye. In some case you can see and hear the action---just depends on the load, drive input torque, input speed, how much or what is out of alignmentn, and gear or driveline backlash. Case in point: I made a quick-tach system for the TC that works on the same principle as a skid steer loader quick-tach (complete with hydraulic powered locking pins). The new mounting plate required I add about 8" to my KK brushhog and the power rake PTO shafts. In the process of my rewelding and extending the shafts I inadvertently lined up or indexed the u-joints to themselves without turning one 90 degrees. Man! It about shook itself apart when I created some goofy angles between the cutter and CUT. Then it dawned on me (as I was driving around doing figure 8's hardy-har-har- har) and that cured the problem (reindexing).
I've talked to engineers that have worked at Ford and Jeep and they had some very interesting production solutions to driveline vibration and how to attenuate them: Some Fords (Thunderbirds??)had big a "block" or cube of casting I believe near the pinion that acted as a "vibration horn" or dissipator; others had resilient rubber mountings for the driveshafts like medium duty trucks have to dampen out vibration; Jeep Comanches and SUV's in the mid 80's had a solid steel bar about 8 inches long secured inside the steering wheel to attenuate vibration. A different type of vibration (not necessarily from driveline) for Volvo over-the-road trucks had the side view mirrors with weights installed inside them. Convertible rear view mirrors (the lighted, self-dimming types) had to be beefed way up so they wouldn't vibrate as much.






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 06-02-2006, 07:09 Post: 130269
kthompson



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earthwrks,

Then it dawned on me (as I was driving around doing figure 8's hardy-har-har- har) and that cured the problem


You know some days just go that. It takes a good man to laugh at himself. ROFLaughing out loud






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Discussion Boards > Active Subjects > Messages as Posted > Wood Chippers 3PH Forum

Thread 130007 Filter by Poster:
cotton 1 | earthwrks 2 | kthompson 3 |




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