I have a 2 3/8quot; aluminum round rodI want to drill a 6mm hole or bore through the rodThe bore must be perfectly centeredI do not have a lathe, but if it's the only way, do they sell them (lathes to work with metal) at Lowe's or Home Depot?
Well aluminum is atleast easier to work with but if perfectly centered is required you would be better off paying a professional but if really close will work, then you got optionsFirst you will need a drill press if not then very carefully with a hand drill, secondly and most important is a vise that will not allow any movement of your stockalways center punch your hole and start small to allow for any errorIf your real motivated you can always build a brace for your drill to keep you striaght out of 2x4's.
They reflect differentlyWhite paper reflects a beam of light diffusely, spreading it in all directionsA shiny metal surface, if it is flat, reflects a beam of light as a unified beam.
What is your measure of 'better'? Aluminum foil has higher reflectivity but white paper is more specular.
aluminum foil, its stronger than paper.
