I asked about the lashup and the effects of milling in a radial drill. Packing ring segements were milled maybe twice a year. I first saw the crazy lashup on the Johansson drill. I transferred to this powerplant in August of 1989. It was then mounted on a fixture on the table of the radial drill which enable the correct radius to be milled. The reinforced phenolic material was bandsawed to within perhaps 1/8" of finished dimensions. Since the powerplant mahcine shop did not have a vertical mill, the supervisor way back in the 1970's decided to use the radial drill as a milling machine. The parts being made were segments of mechanical shaft packing rings, about a 25" inside radius and 30" outside radius. The material being milled was "Micarta" or "reinforced phenolic" plastic. Prior to my arrival at the powerplant, they had been using a Johannson radial drill press to run end mill cutters. It is also not rigid enough for milling.Īs crazy as it sounds, people who did know better tired doing this at the powerplant I work at. ![]() A drill press never was designed for the kind of side loads running milling cutters would impose on the spindle.
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