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So Monday I went out to the farm to look at a shaft on a big air compressor that had sheared. I asked if the clutch was too tight and was told maybe it needed to be loosened. You think? Imagine my surprise when I found it was bolted to the flywheel. After some detective work I discovered the disk was originally welded to the compressor shaft and when it sheared they bolted it. After some back and forth we hatched a plan. I started by boring out the old shaft. I then found an old shaft and cut it to length and prepped it for welding. I needs to be built up a bit.More photos to come.
Reply:Built up the shaft. Turned to size for a press fit. Cleaned up the from side. Pressed into the clutch disk hub... took about 10 tons... nice and tight. Welded to the shaft.More photos in next post.
Reply:I let the shaft cool slowly for a few hours in some vermiculite before taking the assembly back to the farm tonight. Installed the plastic guide bushing and bolted it all back together. They will test it in the morning. It should work better than the rigid setup.
Reply:that's an excellent piece of work fh. nice blending of welding/machining along with tech skill to make it happen.i.u.o.e. # 15queens, ny and sunny fla
Reply:Originally Posted by docwelderthat's an excellent piece of work fh. nice blending of welding/machining along with tech skill to make it happen.
Reply:Originally Posted by forhireHeaded to Pasco this morning to pick up the EDM...
Reply:Nice work as usual forhire.What clearance do you use for a ten ton press fit and that diameter?
Reply:It's hard to see from the photos, but my money is on fatigue failure. Where the 3/8" bolts grade 5 or grade 8 by chance? If so, the distributed load across all of them might have been low enough for the stress to be below the fatigue limit for the bolt material. But the shaft sounds like low or medium carbon steel, since you didn't comment on difficulty in machining the parts. Probably a lower yield strength than the bolts, unless the bolts were really crap. So the shaft might be the weak link when it comes to fatigue. Add a scratch or a poorly machined radius from the plate on the to the shaft when the part was first made and it's matter of when, not if it fails by fatigue. Originally Posted by forhireThanks Doc. They needed the compressor this morning so I had to find a way to make it happen. I was really surprised the 3/8" bolts held and the shaft broke. Hopefully this will work for a long time... or at least unit I get home. Headed to Pasco this morning to pick up the EDM...
Reply:Nice repair.What sort of machine are they running that air compressor on?Mr. HE
Reply:Originally Posted by el bobNew Machine?! Stay tuned for new thread in Machines, Tools & Cutting Methods forum? Nice repair!
Reply:Great work, is there (was) a couple of fiber washers and slip plate of some kind between the 2 mating faces of the clutch? it's unusual to see steel over steel friction clutch or torque-limiter. My guess is they welded it on site in a hurry because it was slipping from worn out friction parts and stretched the temporary fix long enough to forget about it. I hope you will not have to spoil the nice repair you did by having the shaft welded again over the housing.edit: more likely you did not take pictures of the friction parts ( i wish) Last edited by snowbird; 06-19-2014 at 08:02 AM.
Reply:Originally Posted by snowbirdGreat work, is there (was) a couple of fiber washers and slip plate of some kind between the 2 mating faces of the clutch? it's unusual to see steel over steel friction clutch or torque-limiter. My guess is they welded it on site in a hurry because it was slipping from worn out friction parts and stretched the temporary fix long enough to forget about it. I hope you will not have to spoil the nice repair you did by having the shaft welded again over the housing.edit: more likely you did not take pictures of the friction parts ( i wish)
Reply:Randy great job. I had never thought of using a pto to run a large compress here on the farm. A lot of information to digest. Thanks for the outstand post as usual. Richey
Reply:Originally Posted by richeyRandy great job. I had never thought of using a pto to run a large compress here on the farm. A lot of information to digest. Thanks for the outstand post as usual. Richey |
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发表于 2021-8-31 22:28:17