--Having a little problem with same. I'm trying to bore 2-3/4" dia holes thru 2-1/2" thick 304 stainless; gotta do 4 parts. I managed to get the pilot holes up to about .875" with available drillbits, then I switched to a boring head and, moving in increments of 0.1" on diameter I got the holes enlarged to about 1.2" but then suddenly it got reeeeal hard to cut, even with a carbide tipped boring bar. Shallower cuts seem my only option but at this rate it'll be winter B4 I get the holes finished! I'm going to go see a pal with a honkin' big lathe who can speed things up a little bit and that will solve the predicament. --But I'm thinking *next* time I'll want to do something different like use an endmill and a rotary table to hog out that kind of material, then do a cleanup pass on my wimpy little lathe. I'm curious to know what others have done in similar situations. Any ideas?
- posted
13 years ago