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Campbell 2536 Nibbling Machine rebuild
01P1160025_jpg.jpg
This machine got dragged to my storage area in 1984. The shaft was seized so it sat in the weather for 30 years, to season up a bit. P1160017 copy.jpg In 2014 I soaked the 3inch bronze plane bearings for a month with a mix of 50% acetone and 50% ATF (flavor unimportant) with 90psi compressed air force-feeding the oil charges. After 29 days the oil mix began seeping out of the bearings, so I kept force-feeding until I was getting a good flow and hissing from the bearing ends. 3P1160032_jpg.jpg End of 3inch main shaft with eccentric shown. Bearing end would hiss and flow dirty oil mix. (Note that the up-down mechanism has been removed to show the end of the shaft.) 1P1160022_jpg.jpg 4 foot lever arm is bolted to drive sheave w/2ea. 3/4inch bolts and screw jack is applied to lift arm/turn shaft. (Barely visible are two air fittings, one at each end of the frame, which feed air and penetrant down into the oil galleys in the two main bearings.) 2P1160023_jpg.jpg Close-up shows screw jack w/1/2inch drive impact socket welded onto input and 1/2inch drive impact gun is used to raise and lower jack, encouraging lever to loosen shaft. Slow going for a few hours, during which time penetrant additions and forward-reverse efforts on jack slowly get shaft to turn one full inch. At this time the previous owner shows up and mentions that this nibbler fell off of a flat bed truck when he was moving it, so many years previous. This explains why the shaft is so stubborn and why the road rash exists on the motor housing and two corners of the frame. I'm not worried about the frame because it is solid flame-cut plate, 5 inches thick. (MFG date = 1957, post-war "build it to last forever" thinking.) 4P1160033_jpg.jpg I get a strong young lad with cheater bar to grunt on the shaft for a few more hours, getting the shaft to move 90deg, and then 170 deg, back and forth. Now I think the shaft is bent. P1160086 copy.jpg Pullers are never big enough so I make one and start dragging the (custom-by-crash) drive sheave off the shaft end. P1160106 copy.jpg Since that gets the sheave off, I move to the front and shove on the shaft. Some 1" round 4340 TGandP works as a roller bearing for the shaft to retreat. 5P1160687copy.jpg Shaft retreats and also takes the rear bearing free. A nice plus. Then the vertically-applied flame thrower helped expand/loosen the bearing a wee tiny helpful bit so I could slip that off the shaft end. 6P1160689copy.jpg Some cleanup at the machine shop will leave both the shaft and both bearings in nice re-useable condition. Another nice plus. Next up: going through the business end of the main shaft.
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. Last edited by crystallographic; 05-19-2017 at 08:07 AM. |
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Nice write up Kent. I felt your pain! I'm looking forward to Part II.
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Bill Longyard Winston-Salem, NC |
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Big things falling off a truck. Sitting around outside for decades before anything is done. Giant cheater bars. Challenging a young superman to move what can't be moved. Sounds like things around here. Cool to see it coming apart well for you. That's usually the only thing that happens differently here......
Nice to see old equipment being brought back to life. Thanks for posting, Kent.
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AC Button II http://CarolinaSculptureStudio.com https://www.youtube.com/channel/UCzSYaYdis55gE-vqifzjA6A Carolina Sculpture Studio Channel |
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Patience really does pay off when it comes to acetone/ATF mix! You did really well getting that apart, given its history
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How did he phrase that..'oh jeez, I just remembered, this thing fell off the back of the...' He must be from around here.
This is going to be good, we'll need lots of pictures. Whats your plans, use it as a nibbler?
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oj higgins |
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Wow, 33 years taken just to start a project! There's hope for me yet.
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Gareth Davies |
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Kent
Dump some messages you box is full I my have tried to send it twice it may have gone through if not Email me Ken Hosford |
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Quote:
Will check Ebay for those sets.
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
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