Andy Pugh wrote: > 2009/9/6 Erik Christiansen <dva...@internode.on.net>: > > >> Is thinner oil the answer? >> > > Paraffin is commonly used, I believe. > (Google) > You might call it Kerosene. > > Early on as a machinist we cut all aluminum with kerosene or parafin. When you are cutting at the slower speeds used back then it was good stuff. We were always fairly careful not to boil it from the heat of the cutting as It is explosive in a fine mist or steam like vapor. The worst of it was I always smelled of kero. It goes into your skin and hair and stays there for severals days or more. It is such a good cutting fluid for aluminum that I consider coolant only a reasonable substitute . I made a set up to drill a center hole in round billets for Reynolds aluminum co. These billets were slugs to be extruded into aluminum tubing thus the hole in the middle. The material was dead soft and drills sucked their way right in. If you dubbed the points of the drills aluminum packed around the drills even when flooded with cutting fluids and we tried many. We moved the operation into another building because of the smell. Between the stink of aluminum cutting and the smell of oil kero fumes the neighbors complained about the stink. One world war one veteran claimed it smelled like the battlefield of Verdun with rotting bodies and that it made him sick. I have not noticed that smell in modern aluminum. The harder the metal is the better I like it for machining. I say this only for aluminum. Doug
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