Enlarging Holes in Thick Plate

Gallery, Projects and General > How do I??

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awemawson:
Russell,

The assembly is forming a rigid pyramid - but what is not showing in the picture are the lifting arms that pivot on lugs on the tractors axle and the outer ends go onto the pins though the enlarged holes.

Normally these arms are connected to links dropping down from levers on a shaft that runs parallel to the axle, but at a higher level. the shaft being rotated by a beefy hydraulic cylinder and thus raising the arms.

Now if the hedging flail rocks from side to side, more load is placed on one lifting arm than the other, and this over torques the shaft, and indeed has broken one in the past :(

I am doing away (while the flail is mounted) with the links that drop down from the levers, and replacing the lifting hydraulic force with this rigid pyramid of adjustable 'top links' so I can pre-set the height off the ground, but when tightened up there will be no slop at all.

On the rear of the tractor (all tractors) there is a mounting point for the 'top link' that is specially designed to be a strong attachment point, comprising a pair of projecting lugs with a pin through them. The actual 'top link' goes between these lugs and my 'support top links' will go on the same pin, but on the outer side of the lugs. To avoid having a wide (and thus easily bent) pin, the 'support top links need to be snug up against the lugs. I am planning to weld up a bridge piece to pick up the ends of the pin and take reinforcement from a second pair of lugs this particular tractor is furnished with.

A bit complicated - I hope I explained that lucidly :scratch:

micktoon:
Hi Andrew look like the job turned out well , excuse the pun :lol:. I used to own a 1956 Grey Fergie TEF20 4 cylinder diesel and remember messing about trying to get impliments to fit that , flail mower etc, The little tractor still did everything it would have done when it was new 50 years after it was built :thumbup:

Cheers Mick.

awemawson:
This project has been dragging on as I have failed to source 'bent eyes' for the 'top links' so today I decided to take things in hand and ask the oxy-acetylene torch to give me a hand!

You'll recall that standard ends are straight but I needed cranked ones to get the correct angle

awemawson:
So with the help of the gas axe we ended up with this:

awemawson:
Currently they are cooling - when just warm they'll get a light spray of zinc rich paint to replace what was burnt off.

I had a bit of inspiration the other day - went to an 80 th birthday celebration of a friend, which involved staying over night in the motorhome on a local farm. Tucked in a barn obviously not used for decades was 'the real thing' A hedge flail mounted on a tractor using the proper adaptor plate. First time I've been able to get 'up close and personal' with this item. Well not too close, it was deeply buried in nettles.

However I got a few photos of the adaptor and the way the lower pins were supposed to be.

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