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Kryptonite Bushings

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epanzella

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A friend of mine needed to get four bushings turned down in a hurry as a huge job paving an airport was held up waiting for the work to be done. The bushings were 9 inches long, 6 1/2 inches in diameter and had a 3 inch bore. The busing are used to mount a paving hammer on a 50,000 pound excavator. One excavator broke so they had to move the hammer to another machine and they were too wide by 3/8". I don't know what the hell they were made of but any faster than 200 rpm and .025 DOC and my carbide cutters were spewing flames like the 4th of July! HSS cutters would last about 5 seconds! It took me 9 hours to do the four of them. Anybody have a clue what those kinds of bushings are made of?
 

benmychree

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Unobtainium. Seriously, 'tho, just about any alloy steel can be heat treated to that level. Ceramic tools will triumph over such hard stuff.
 

rwm

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Kryptonium. The fissionable isotope of Kryptonite.
R
 

darkzero

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I don't use mine often but these come in handy. Of course you can simply just use any file to get an idea of how hard something is & don't really need this set.


18750_700x700.jpg
 

epanzella

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I did a file test before accepting the job. It did score but seemed it took more effort than normal. Not having a lot of experience machining hard stuff I thought it was just my imagination but I guesss it wasn't.
 
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