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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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Laying out a bolt circle?
OK, I now know several ways not to do this. Sounds simple - 4 holes,
evenly spaced, around a circle 0.600" in diameter. The center of the circle, I can find easily (lathe & center drill). The edges are concentric to the center, by definition, because I turned it on that lathe. I marked the 0.600" circle on the face of the disk by lightly touching it with a cutting tool on the lathe & turning the work around, scribing a circle at the right diameter. Now, how do I get the 4 points layed out properly from there? I can use a center finder to get two of 'em, but how do I get the other two evenly spaced from those points? Or, worse yet, what if I wanted 3, or 5 holes on that circle, rather than 4? Dave Hinz |
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