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Tool Talk Discussion Forum

Graphite Rods and Brazing

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Weirddeere

07-14-2020 16:04:26




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I have a HEAVY cast axle with a blown out pivot pin whole. Factory is 1 3/8, it's now pushing 1 3/4

I'm debating my options. If I had a mill I'd do that immediately. I'm just trying to see how I can get it done myself without going out for it.

Could I put a graphite rod in the hole of the proper size then build the wear up with brazing? I know it works with welding, I would assume the same with braze?

Like these:
https://www.mcmaster.com/graphite-rods/


Thanks for any tips, even other ideas,
Brandon

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tlock0331

07-24-2020 19:10:34




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
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if your friend has a mill, can you get solid stock and take it out to the size you need instead of looking for a "correct" size pipe/tube? if its only 4 ish inches, stock wouldnt to be terribly bad, and hes your buddy, so a few beers...



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Brian G. NY

07-23-2020 12:57:52




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
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A good question.......Allis-Chalmers uses cast steel on a lot of parts for their tractors and equipment.

Welds easily.....even for a "so-so" welder like myself.



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Weirddeere

07-23-2020 16:14:01




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 Re: Graphite Rods and Brazing in reply to Brian G. NY, 07-23-2020 12:57:52  
I have not done the spark test yet, I need to.

I've been trying to stay away from welding, even if it is cast steel because I'm afraid of #1 screwing it up, then #2, making it VERY hard with weld and nearly impossible to machine back out my Ooops

Brandon



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RBoots

07-22-2020 19:42:19




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
Is it cast iron or cast steel?



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NAllen

07-16-2020 23:17:06




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
I didn't see any 1-3/8" graphite rods at the link...

Last year, I begged some milling machine time from a friend and did this to my Oliver 550 adjustable front axle. I used two bushings end-to-end in the bore (1-1/2 OD x 1-3/8ID).



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Weirddeere

07-17-2020 07:39:15




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 Re: Graphite Rods and Brazing in reply to NAllen, 07-16-2020 23:17:06  
I've got a buddy with a mill but the axle is too heavy for both of us to lift up onto it in his home shop. He's the first I asked.

He referred me to another guy who would do it, and the price was reasonable but more then I really want to shell out at the moment. Can't blame the guy, gotta make money.

The site doesn't have rods of the right size but I know I can turn one down. But I think I've got a workable solution if I get the right size pipe. I hate this little bit of rig job but it will last longer then me, and still be 100% better then it was

Brandon

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Ragnarok

07-15-2020 10:47:40




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
I was born and raised poor....my father would weld that up bead after bead and grind it out...he would likely weld-up the pin too!



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Weirddeere

07-15-2020 11:01:14




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 Re: Graphite Rods and Brazing in reply to Ragnarok, 07-15-2020 10:47:40  
I am actually pretty sure I'll flip the pin 180 (it doesn't float, held in place with a bolt) and weld it up

The axle I was thinking of brazing, mainly because it's cast. I thought about brazing without a pipe but getting a round and properly located hole would be REALLY hard since I can't drill it back out.

Brandon



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Ragnarok

07-15-2020 10:11:19




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
I've taken stuff like that to the local machine shop and had it bored and sleeved back to size...helps if ths shop has a good center pin to measure



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Weirddeere

07-15-2020 10:16:03




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 Re: Graphite Rods and Brazing in reply to Ragnarok, 07-15-2020 10:11:19  
That would be my normal route but I am out of a job and trying not to be stupid with money.

And it ANNOYS me that I don't have access to a mill to do it myself. I want the practice.

Brandon



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DoubleO7

07-15-2020 08:08:07




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
How long does the pipe/sleeve need to be?



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Weirddeere

07-15-2020 08:20:06




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 Re: Graphite Rods and Brazing in reply to DoubleO7, 07-15-2020 08:08:07  
Keep forgetting to lay a tape on it but probably about 4 inches

Brandon



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baldy347

07-15-2020 04:00:02




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
A guy posting as fireball tool has a video on removing the inside weld seam that seems to work well.



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Weirddeere

07-15-2020 07:56:26




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 Re: Graphite Rods and Brazing in reply to baldy347, 07-15-2020 04:00:02  
I know the poster you're talking about but had missed that one. Very interesting idea, though overkill for the one pipe I might do haha

Brandon



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DoubleO7

07-14-2020 18:23:01




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
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Without a mill, how are you going to get a 1.66" dia. Hole for the 1-1/4" pipe exactly where it needs to be? Will the 1 .38 inside dia. Of the pipe be good enough? Common ERW pipe will have a light weld seam inside. Might have to use seamless.



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Weirddeere

07-14-2020 20:07:58




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 Re: Graphite Rods and Brazing in reply to DoubleO7, 07-14-2020 18:23:01  
The diameter should be doable, even if it needs a little finessing. Die grinder might clean up any internal welding.

Locating the pipe would be tough and I'm thinking up solutions, maybe welding it onto a plate on one side that will locate it while I do whatever else in the mess that is the original bore. I think braze but not sure. Then cut it off when done.

I'm thinking out loud.

Will it be a super precise fix, no, but a LOT better then how it is now and should be durable to last for my hobby use

Brandon

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t.r.k.

07-14-2020 18:08:50




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
I think you could. There was a series of videos by 'turn right machine works' on Youtube where the author built up a lathe cross slide using graphite or similar cores for shaping his brazing. They were posted on Youtube just a few weeks ago.



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Weirddeere

07-14-2020 20:08:44




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 Re: Graphite Rods and Brazing in reply to t.r.k., 07-14-2020 18:08:50  
I know his videos but missed those, I will look, THANKS

Brandon



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Phonostud

07-14-2020 16:31:05




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
Greetings Brandon: You might be able to solder in a piece of thin wall steel tubeing, or weld it in place. I have arc welded grey iron castings several times, and have had the best luck with 6000 series electrodes. The nickle alloy rods made for grey iron
usually didn't work as well. One part couldn't be welded with either one. Bad chemistry probably. Good Luck!



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Weirddeere

07-14-2020 16:43:39




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 Re: Graphite Rods and Brazing in reply to Phonostud, 07-14-2020 16:31:05  
You might be onto something.

1 1/4 pipe is 1.380 ID
The pin is 1.375 OD, so it'd be a good match

Thank you, you're getting my brain going, my main concern was how to get a decent hole after adding material!!!

Brandon



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svcummins

07-14-2020 16:27:02




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:04:26  
The first thing Id do is buy a new grease gun



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Weirddeere

07-14-2020 16:30:58




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 Re: Graphite Rods and Brazing in reply to svcummins, 07-14-2020 16:27:02  
Tell the guys that beat it to death the 50 years before me. Most of that excessive grease is probably from me. The kingpins are just as bad, none of the fittings would take grease until I messed with it with penetrating oil and a torch...but too late.

Brandon



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svcummins

07-15-2020 21:36:08




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 Re: Graphite Rods and Brazing in reply to Weirddeere, 07-14-2020 16:30:58  
Cockeyed grease worms 🐛 anyway



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