Author Topic: 3 point Linkage crane  (Read 693 times)

Offline Will_D

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3 point Linkage crane
« on: March 10, 2017, 06:18:31 PM »
This is primarily aimed at the farmers here!!

I have a nice green Deutz tractor (with soft turf tires for use in the rugby club).

It has a full 3 point linkage for the various attachments - Ok no problermo

So my wacky MM idea is:

How to design a structure that mounts on the 3 point and probably the main hitch that could user the movement of the 3 point lifting arms to create a crane effect?

Would be nice to vary lift reach and lifting capacity with a set of holes.

Yes it has hydraulics but now we expensive!!

I really want a set of articulated levers that will transition the 3 point lift to a say 2,3,4 times lift!
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Offline sparky961

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Re: 3 point Linkage crane
« Reply #1 on: March 10, 2017, 08:13:26 PM »
Probably not a solution to your issue, but in looking at linkages myself recently I came across this neat video that might provide some inspiration.

<a href="http://www.youtube.com/watch?v=RQi6gXZHyAc" target="_blank">http://www.youtube.com/watch?v=RQi6gXZHyAc</a>
« Last Edit: March 10, 2017, 10:17:52 PM by sparky961 »

Offline John Hill

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Re: 3 point Linkage crane
« Reply #2 on: March 10, 2017, 10:07:40 PM »
Hi,  Google 'Ferguson Crane' and you will find many pictures of what you have in mind.
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Offline efrench

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Re: 3 point Linkage crane
« Reply #3 on: March 10, 2017, 10:08:18 PM »
Rugby must be a pretty rough sport if tractors are allowed  :doh:

Offline awemawson

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Re: 3 point Linkage crane
« Reply #4 on: March 11, 2017, 02:30:15 AM »
There are two designs that I've seen. The first is a simple gallows shape with the lift entirely provided by lifting the linkage arms. The second is essentially a conventional engine crane mounted on the three point linkage with the hydraulic cylinder operated off a spool valve on the tractor rather than a hand operated pump.

Andrew Mawson
East Sussex

Offline Joules

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Re: 3 point Linkage crane
« Reply #5 on: March 11, 2017, 04:37:40 AM »
Rugby must be a pretty rough sport if tractors are allowed  :doh:

Only for removing the dead.
Just get doing and make swarf, you can decide what its going to be later.   :thumbup:

Offline catceefer

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Re: 3 point Linkage crane
« Reply #6 on: March 11, 2017, 05:01:25 AM »
I am not sure whether it will help, but this free software programme is good for designing and testing linkages, such as a crane. It also has several examples. I am using it to draw up some linkages for a rolling-ball clock.

http://blog.rectorsquid.com/new-linkage-3-4/


Regards,

James.

Offline awemawson

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Re: 3 point Linkage crane
« Reply #7 on: March 11, 2017, 06:16:50 AM »
Here are the two designs that I mentioned
Andrew Mawson
East Sussex

Offline Will_D

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Re: 3 point Linkage crane
« Reply #8 on: March 11, 2017, 09:13:55 AM »
Many thanks guys.

Must get scratching out a design in Fusion 360

Having just planted 36 apple trees in the club grounds I think a 3 point, PTO powered apple planter should be next!!

If all my grafts take then its 60 apples and perry pears next year.

PS: Anyone on here make Perry?
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