#101
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I had about a .001” press fit on a 6.710” bore. I then made the internal bore for bearing about .005” over the nominal 6.250” bearing. I did not want yo have to set back up after pushing the bearing and welding to take a bit out. The internal bore measured about 6.252” when I verified it this morning before installing the bearings. If you have any other suggestions for the actual press fits numbers I should’ve shot for, please let me know. The material I used to sleeve it was just a piece of hone tube barrel material I had on the shelf. I probably should use a better grade, but then again I’m not the guy that will stand up and let the boss know we are not doing it totally right, unless it absolutely needs it. For the most part, I do not think any of these repairs has failed miserably in the past, and I can’t recall having a cylinder come back needing the same repair yet. We do stamp each job going out, so we can look up what we did the previous time it was in for repair. We have some customers that just abuse their equipment, and they know it. If we can get them another run or two out of a rebuild and save them from buying a new cylinder every time, they are happy. Sent from my iPhone using Tapatalk
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Brian You don't know what you don't know. "It's what you learn after you know it all that counts." John Wooden |
#102
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I use .001" per inch of diameter for a press fit.
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Drawing by Smartdraw |
#103
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I’ll see if I can get any specs for those. Do you happen to still have a part number for the bearings?
Swivel bearings are different, but generally Cat uses .001” per inch of diameter on plain bearings/bushings. Sent from my iPhone using Tapatalk |
#104
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The bearings were 8J-8906 CN. Appreciate the help. My searches have not turned up much in specs, or I am not looking in the right areas. Sent from my iPhone using Tapatalk
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Brian You don't know what you don't know. "It's what you learn after you know it all that counts." John Wooden |
#105
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Had to make a couple of adaptor bushings to turn a water valve on a water truck for a local excavation company. They need to tie two valves together. My job was to create the bushing with an ablong hole in it to take place of the normal valve handle. They will fab up the steel strap to weld onto it. A bit if lathe and mill work. I did use a 1/4” end mill to widen the ends so hopefully it will fit their valves without much hand filing.
The end mill pic is one that I had hand sharpened the end on. It worked fine plunge cutting. I only cut about 1/4 of the diameter at a time, so take it littler bites. Sent from my iPhone using Tapatalk
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Brian You don't know what you don't know. "It's what you learn after you know it all that counts." John Wooden |
#106
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Quote:
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Gerry You got freedom of speech, if you don't say too much. Aaron Neville. When a liberal screams racism, you can bet they were also born with white skin. Common sense is like deodorant. The people that need it most never use it. Joe Concha |
#107
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https://propelparts.us/caterpillar-e...sp-8j8906.html Specifications for part number 8J-8906 Inside Diameter (in): 3.250 Length (in): 4.000 (Inner Bearing) Outside Diameter (in): 6.250 Weight 20 lb
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Gerry You got freedom of speech, if you don't say too much. Aaron Neville. When a liberal screams racism, you can bet they were also born with white skin. Common sense is like deodorant. The people that need it most never use it. Joe Concha |
#108
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Made a thin bushing
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That was factory stop. It is attached to the front of the vice when not in use. Took me a couple years to realize what it was, and maybe a video of someone else. I think I was the first one in my shop to know what it was for. It’s painted yellow to match my color coded Allen wrench holder, so I can quickly grab the right size Allen. Sent from my iPhone using Tapatalk
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Brian You don't know what you don't know. "It's what you learn after you know it all that counts." John Wooden |
#109
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Thanks for checking Gerry. I looked at those links, but could not find actual specs on that site. Then I checked Cat.com and found the specs you listed. But the one other spec that I needed as a machinist was the length of the Outer bearing race. This bearing was held in by a snap ring on either side, so I had to have grooves machined just right. Do to the condition these showed up at my shop, I could not determine the original specs. So I had to wait until the actual replacement bearings showed up. The customer provided it. We have used aftermarket bearings before, and they sometimes do not hold up as long as OEM, so sometimes we just let the customer send us what they want installed. Usually we try not to machine any parts unless we have the new parts to install in hand, to physically verify dimensions. We have been seeing quite a bit of parts coming in that should not have passed quality control. Sent from my iPhone using Tapatalk
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Brian You don't know what you don't know. "It's what you learn after you know it all that counts." John Wooden |
#110
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Quote:
__________________
Gerry You got freedom of speech, if you don't say too much. Aaron Neville. When a liberal screams racism, you can bet they were also born with white skin. Common sense is like deodorant. The people that need it most never use it. Joe Concha |
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