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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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Setting Lathe compound at precise angle, a Real Keeper!!!
I just summarized a recent post for myself, so I can add it to my own
"machining hints" notebook. This one is one of those real keepers, as far as I am concerned. Thanks to the original poster and the guys who answered him. Pete Stanaitis. The Question: I'd like to try to turn some short tapers with a lathe. I'd be interested in suggestions on how to set a fairly precise angle. Answers: 1. If you have a sample of the taper needed: You start with a piece with that known taper mounted in the lathe and centered. Then you mount a dial test indicator in the toolpost and crank the compound rest back and forth watching the needle (indicating the taper, obviously). When the needle doesn't move, you have matched the taper. 2. If you don't have a sample of the taper needed: Fairly precise? With the engraved numbers on the cross slide. Preciser? With a cylindrical round in the chuck, a dial indicator on the compound and feeding a known distance with the compound. The rest is math. 3. If you don't have a sample of the taper needed: A guy I used to work with had a sine bar that had a base which was mounted between centers. The actual sine bar was hinged. I think he held the gage blocks and all together with rubber bands. I suppose he used a dead center under pressure to keep everything from moving. |
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