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Old 05-27-2010, 12:18 PM
schmeky schmeky is offline
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Hardest Barrel Bushing in the World?




The bushing on the left, marked with "N" and "M" (National Match) is the hardest bushing I have ever encountered. These appear to be made from tool steel, or hardened to a tool steel grade. A Nicholson file will not touch these things.

I had to cut the one on the right with a carbide insert. I have a set of tool steel parting cutters and this bushing burned the cutting edge when I tried to make a .003" cut. Who makes these? Has anyone ever used these before? I bought them cheap off Ebay and ironically, they are some of the best finished I have ever seen, but I'm paying for it with shop time and tool life. The ugly thing in the top of the photo is my home made bushing mandrel.


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Old 05-27-2010, 01:09 PM
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If they're that hard, they'll likely break. Hardening steel "too hard" makes it brittle.
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Old 05-27-2010, 01:44 PM
Joe C Joe C is offline
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Schmeky,

Sometime last year we got some bushings in that were NM with a contract number. They were so hard they couldn't be turned either. We sent them back. Turns out they had the heat treatment wrong on the whole batch. Don't know if they ever got this fixed. Real pain in the butt. Wonder if this was an un-number model of the same batch.

Kart makes a great bushing and so does MGW if you don't mind fitting them.

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Old 05-27-2010, 01:55 PM
schmeky schmeky is offline
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Joe C,

A-ha. That makes sense. I almost exclusively use an OS Ed Brown (not that others aren't as good). I may just chunk these and get some name brand bushings.

Thanks for solving this mystery.
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Old 05-27-2010, 02:27 PM
Joe C Joe C is offline
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You are most welcome sir.

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