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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Tool holder geometry, carbide vs ceramic, trigon inserts
The other day, I needed to turn a shaft to 25mm diameter for a machine at work. Not a big
deal I thought. I only need a 7" shaft, I'm turning 12L14, this should be easy. The first problem I ran into is that the normal CMNG tool holder I use would not clear the live center (this is a big lathe). So I looked around, I found a tool holder of the trigonal type. It had a ceramic insert in it but I knew where we had a machine running a carbide trigonal insert and installed one of those. Well, I never got a decent finish, it was so bad you could ridges across the item I turned. I tried a different carbide insert and it wasn't any better. It got to the point that I used a bit of sand paper, pressing the shaft through a bearing to burnish it to get a shaft I could use. I tried playing with the feed, speed and tweeking the tool height. Nothing made a difference. I should have just turned a longer shaft using the CMNG tool holder that always worked and parted off the excess. Anyway, what was the likely issue? It did look like the trigon tool holder had a bit more inclination but I didn't measure it. Thanks, Wes -- I was a skeptic before I became a cynic. |
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