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Message: <blockquote data-quote="jerry" data-source="post: 12291" data-attributes="member: 931"><p>Tazza, that rail drill looks like it is gas powered? That would be really handy for boring big machinery on site. Worked in the taconite mines for 20 years and we did a lot of big bores with homemade bars. After 43 years of machining I have found there is always more to learn. My Machinery Handbook is the 1941 edition and just as relevant now as then. It is surprising some of the oem tolerances and how loose they are. We made cylinders for a company for a few years and they wanted .015-.020 clearance on the bushings so that is what they got. Probably easy to assemble but not good.</p></blockquote><p></p>