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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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cutting threads on lathe
I finally attached the thread cutting kit to a sherline lathe. The kit
came with a 60 degree carbide cutter. Even with 1/4" brass rods, that broke in probably minutes, followed by the spare I had. the cuts looked like **** too. They weren't really shiny and the "feel" from the handcrank on the headstock/gear train didn't seem right. I was only cutting 2 to 3 mils per pass. I decided to gring my own with 1/4" HSS steel blanks on a Tormek knife sharpener. That worked much much better. The cuts look nice and shiny. So what's the deal with the ugly finish I was getting with carbide? I think I know why the tips snapped off, but the finish part I don't understand. A mild steel rod looked awful with the carbide cutter too. It looked like there was more tearing or smearing than cutting going on. |
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