Some disc repairs

jon f mn

Well-known Member
Made a trade on a really heavy disc to add to my collection, but ot is in need of some repair. As is most of what I have. Lol.

Anyway, one of the gang shafts was broke so I fixed that first.

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First I torch cut a v on both ends.

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Then ground them smooth.

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Then clamped the axle to an angle to hold it straight and welded a couple passes to hold it.

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Once I had it stuck together I turned it over and back ground it so I had full and clean penetration.

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Then just welded it out. I used 7018 at about 120 amps, but I think my input power is a little low so that is probly more like 110 amps or so. I welded alternating sides to keep it from pulling and checked after each to see if it was pulling to one side more, but it stayed nice and straight. If you do a job like th8s and it starts to pull you can run a couple extra welds on the back side to counter that.

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Then just ground it down to round. Turned out nice and straight and went together fine.

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Do you think it will hold??? The reason I am asking is I have tried that on smaller disk axles and they broke. The last one I did might have held but I heated the entire axle in my forge after I welded it to get any heat stress out of the joint. I sold the disk soon after so I do not know if it lasted or not. The earlier attempts did not hold.
 

Did you turn it every pass? or how many? probably less frequently as you got more metal on there?
 
I turned it every time. If it starts to warp you can counter that by welding more on the long side, but
this time it stayed straight so I just kept it even.
 
Nice fix Jon.
I enjoy making repairs like that. And if
you pay attention to things you can keep
the shaft pretty straight. For sure
straight enough for a slow turning machine
like that.
 
A long time ago, in a land far away (Oklahoma) my dad broke a disk shaft like that. Took it the local blacksmith. He heated both ends in his forge and beat them into a taper. Heated them really hot and beat them back together. No problem after that.
 
(quoted from post at 18:22:24 09/04/16) A long time ago, in a land far away (Oklahoma) my dad broke a disk shaft like that. Took it the local blacksmith. He heated both ends in his forge and beat them into a taper. Heated them really hot and beat them back together. No problem after that.

I'll bet that there are few guys around any more who could do that.
 

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